← Latin for Biologists and Gardeners — Botanical Latin
###
Welcome to Lesson 91 of the Latinum Institute Botanical Latin Reading Course, designed for English-speaking autodidact students of botanical and biological Latin. This lesson series is available as part of our wider language course offerings at https://latinum.substack.com/p/index
What does “deorsum” mean in Botanical Latin?
The Latin adverb deorsum (sometimes written deorsus or deovorsum in older texts) means “downward,” “downwards,” or “in a downward direction.” It derives from the combination of the preposition dē (down from, away from) and vorsum/versum (turned, in the direction of). In botanical Latin, deorsum is one of the most important directional terms, appearing constantly in morphological descriptions to indicate the orientation of plant structures — whether leaves curve downward, stamens dehisce in a downward direction, or stems taper as they descend. Its opposite is sursum (upward, upwards), and the two are frequently paired in botanical diagnoses to describe gradients or contrasting orientations within a single structure.
Beyond the adverb itself, the prefix dē- generates a rich family of botanical descriptive terms: dēcurrēns (running down, as when a leaf base extends down the stem), dēflexus (bent downward), dēpendēns (hanging down), dēcumbēns (lying down with an ascending tip), and dēmersus (submerged, plunged down). These terms appear in both species epithets and diagnostic descriptions, making the concept of “downward direction” one of the most productive morphological categories in the botanical Latin vocabulary.
Key Takeaways: -
Deorsum is the primary adverb for “downward” in botanical Latin, opposed to sursum (upward) -
The prefix dē- produces numerous botanical descriptors: decurrens, deflexus, dependens, decumbens, demersus -
Directional terminology is essential for reading morphological descriptions and taxonomic diagnoses -
Many species epithets contain the dē- prefix, such as Calocedrus decurrens (incense cedar) -
Classical Latin usage (Cicero, Seneca) provides the foundation for the botanical technical vocabulary
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
deorsum [deˈɔr.sum] — stress on the second syllable; the e is short, the o is open. In traditional English botanical pronunciation: “dee-OR-sum.” In restored classical pronunciation: “de-OR-soom.”
sursum [ˈsur.sum] — stress on the first syllable. English botanical: “SUR-sum.” Classical: “SOOR-soom.”
decurrens [deˈkur.reːns] — stress on the second syllable; double r is distinctly trilled. English botanical: “de-KUR-enz.” Classical: “de-KOOR-rens.”
deflexus [deˈflek.sus] — stress on the second syllable. English botanical: “de-FLEK-sus.”
dependens [deˈpen.deːns] — stress on the second syllable. English botanical: “de-PEN-denz.”
decumbens [deˈkum.beːns] — stress on the second syllable. English botanical: “de-KUM-benz.”
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
1.1a Folia deorsum curvantur. 1.1b Folia (ˈfo.li.a) leaves-NOM.PL.NEUT deorsum (deˈɔr.sum) downward curvantur (kurˈwan.tur) are-curved-PASS.3PL
1.2a Rami deorsum pendunt. 1.2b Rami (ˈraː.miː) branches-NOM.PL deorsum (deˈɔr.sum) downward pendunt (ˈpen.dunt) hang-3PL
1.3a Radices deorsum crescunt. 1.3b Radices (raˈdiː.keːs) roots-NOM.PL deorsum (deˈɔr.sum) downward crescunt (ˈkres.kunt) grow-3PL
1.4a Caulis deorsum attenuatus est. 1.4b Caulis (ˈkaw.lis) stem-NOM.SG deorsum (deˈɔr.sum) downward attenuatus (at.te.nuˈaː.tus) attenuate-NOM.SG est (est) is
1.5a Capsula deorsum alata est. 1.5b Capsula (ˈkap.su.la) capsule-NOM.SG deorsum (deˈɔr.sum) downward alata (aˈlaː.ta) winged-NOM.SG.FEM est (est) is
1.6a Spadix deorsum florens observatur. 1.6b Spadix (ˈspa.diks) spadix-NOM.SG deorsum (deˈɔr.sum) downward florens (ˈfloː.reːns) flowering-NOM.SG observatur (ob.serˈwaː.tur) is-observed-PASS.3SG
1.7a Antherae valvulis deorsum dehiscentes sunt. 1.7b Antherae (anˈteː.rae) anthers-NOM.PL valvulis (walˈwu.liːs) by-valvules-ABL.PL deorsum (deˈɔr.sum) downward dehiscentes (deː.hisˈken.teːs) dehiscing-NOM.PL sunt (sunt) are
1.8a Stipes albidus deorsum incrassatus est. 1.8b Stipes (ˈsti.peːs) stipe-NOM.SG albidus (ˈal.bi.dus) whitish-NOM.SG deorsum (deˈɔr.sum) downward incrassatus (in.krasˈsaː.tus) thickened-NOM.SG est (est) is
1.9a Pinnae in apice deorsum curvae sunt. 1.9b Pinnae (ˈpin.nae) pinnae-NOM.PL in (in) in apice (ˈa.pi.ke) apex-ABL.SG deorsum (deˈɔr.sum) downward curvae (ˈkur.wae) curved-NOM.PL.FEM sunt (sunt) are
1.10a Folia decurrentia basim caulis deorsum extenduntur. 1.10b Folia (ˈfo.li.a) leaves-NOM.PL decurrentia (de.kurˈren.ti.a) decurrent-NOM.PL.NEUT basim (ˈba.sim) base-ACC.SG caulis (ˈkaw.lis) of-stem-GEN.SG deorsum (deˈɔr.sum) downward extenduntur (eks.tenˈdun.tur) extend-PASS.3PL
1.11a Primo unicolor est, dein sensim deorsum nigrescit, sursum nitorem smaragdinum conservat. 1.11b Primo (ˈpriː.moː) at-first unicolor (uˈni.ko.lor) of-one-colour-NOM.SG est (est) is dein (deːn) then sensim (ˈsen.sim) gradually deorsum (deˈɔr.sum) downward nigrescit (niˈgres.kit) grows-dark-3SG sursum (ˈsur.sum) upward nitorem (niˈtoː.rem) gloss-ACC.SG smaragdinum (sma.ragˈdiː.num) emerald-green-ACC.SG conservat (kon.ˈser.wat) preserves-3SG
1.12a Sepalis basi solutis seu ultra insertionem deorsum longe productis. 1.12b Sepalis (ˈse.pa.liːs) with-sepals-ABL.PL basi (ˈba.siː) at-base-ABL.SG solutis (soˈluː.tiːs) freed-ABL.PL seu (sew) or ultra (ˈul.tra) beyond insertionem (in.ser.tiˈoː.nem) insertion-ACC.SG deorsum (deˈɔr.sum) downward longe (ˈlon.geː) far productis (proːˈduk.tiːs) extended-ABL.PL
1.13a Antherae subsessiles extrorsum et deorsum dehiscentes sunt. 1.13b Antherae (anˈteː.rae) anthers-NOM.PL subsessiles (sub.sesˈsiː.leːs) subsessile-NOM.PL extrorsum (eksˈtrɔr.sum) outward et (et) and deorsum (deˈɔr.sum) downward dehiscentes (deː.hisˈken.teːs) dehiscing-NOM.PL sunt (sunt) are
1.14a Clava distincta, alba, recta, fistulosa, elongata, deorsum cylindrica, sursum subulata. 1.14b Clava (ˈkla.wa) club-NOM.SG distincta (disˈtink.ta) separate-NOM.SG.FEM alba (ˈal.ba) white-NOM.SG.FEM recta (ˈrek.ta) straight-NOM.SG.FEM fistulosa (fis.tuˈloː.sa) hollow-NOM.SG.FEM elongata (eː.lonˈgaː.ta) elongate-NOM.SG.FEM deorsum (deˈɔr.sum) downward cylindrica (ky.ˈlin.dri.ka) cylindric-NOM.SG.FEM sursum (ˈsur.sum) upward subulata (su.buˈlaː.ta) subulate-NOM.SG.FEM
1.15a Flores deorsum spectantes in racemo nutante dispositi sunt, dum bracteae sursum versus patentes persistunt. 1.15b Flores (ˈfloː.reːs) flowers-NOM.PL deorsum (deˈɔr.sum) downward spectantes (spekˈtan.teːs) facing-NOM.PL in (in) in racemo (raˈkeː.moː) raceme-ABL.SG nutante (nuˈtan.te) nodding-ABL.SG dispositi (dis.ˈpo.si.tiː) arranged-NOM.PL sunt (sunt) are dum (dum) while bracteae (ˈbrak.te.ae) bracts-NOM.PL sursum (ˈsur.sum) upward versus (ˈwer.sus) towards patentes (paˈten.teːs) spreading-NOM.PL persistunt (per.ˈsis.tunt) persist-3PL
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
1.1 Folia deorsum curvantur. “The leaves curve downward.”
1.2 Rami deorsum pendunt. “The branches hang downward.”
1.3 Radices deorsum crescunt. “The roots grow downward.”
1.4 Caulis deorsum attenuatus est. “The stem is attenuate downwardly.”
1.5 Capsula deorsum alata est. “The capsule is winged downward.”
1.6 Spadix deorsum florens observatur. “The spadix is observed flowering downward.”
1.7 Antherae valvulis deorsum dehiscentes sunt. “The anthers are dehiscing downward by valvules.”
1.8 Stipes albidus deorsum incrassatus est. “The whitish stipe is thickened downward.”
1.9 Pinnae in apice deorsum curvae sunt. “The pinnae are curved downward at the apex.”
1.10 Folia decurrentia basim caulis deorsum extenduntur. “The decurrent leaves extend downward to the base of the stem.”
1.11 Primo unicolor est, dein sensim deorsum nigrescit, sursum nitorem smaragdinum conservat. “At first it is of one colour, then gradually it grows dark downward, while upward it preserves an emerald-green gloss.”
1.12 Sepalis basi solutis seu ultra insertionem deorsum longe productis. “With the sepals freed at the base, or extending far downward beyond the insertion point.”
1.13 Antherae subsessiles extrorsum et deorsum dehiscentes sunt. “The anthers are subsessile, dehiscing outward and downward.”
1.14 Clava distincta, alba, recta, fistulosa, elongata, deorsum cylindrica, sursum subulata. “The club is separate, white, straight, hollow, elongate, cylindric downward, subulate upward.”
1.15 Flores deorsum spectantes in racemo nutante dispositi sunt, dum bracteae sursum versus patentes persistunt. “The flowers, facing downward, are arranged in a nodding raceme, while the bracts persist, spreading upward.”
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
1.1 Folia deorsum curvantur.
1.2 Rami deorsum pendunt.
1.3 Radices deorsum crescunt.
1.4 Caulis deorsum attenuatus est.
1.5 Capsula deorsum alata est.
1.6 Spadix deorsum florens observatur.
1.7 Antherae valvulis deorsum dehiscentes sunt.
1.8 Stipes albidus deorsum incrassatus est.
1.9 Pinnae in apice deorsum curvae sunt.
1.10 Folia decurrentia basim caulis deorsum extenduntur.
1.11 Primo unicolor est, dein sensim deorsum nigrescit, sursum nitorem smaragdinum conservat.
1.12 Sepalis basi solutis seu ultra insertionem deorsum longe productis.
1.13 Antherae subsessiles extrorsum et deorsum dehiscentes sunt.
1.14 Clava distincta, alba, recta, fistulosa, elongata, deorsum cylindrica, sursum subulata.
1.15 Flores deorsum spectantes in racemo nutante dispositi sunt, dum bracteae sursum versus patentes persistunt.
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
These are the grammar rules for deorsum and its related directional vocabulary in Botanical Latin:
1. The Adverb Deorsum
Deorsum is an indeclinable adverb — it never changes form regardless of the gender, number, or case of the words around it. It modifies verbs (crescunt deorsum — “they grow downward”), participles (deorsum dehiscentes — “dehiscing downward”), and adjectives used predicatively (deorsum cylindrica — “cylindric in the downward part”). Its position is flexible: it may precede or follow the word it modifies, though in botanical diagnoses it most commonly precedes the participle or adjective it governs.
2. Etymology and Formation
Deorsum is a contraction of dē (down from) + vorsum/versum (turned, in the direction of), literally “turned downward.” The related form deorsum versus is an emphatic variant meaning “directed downward.” The opposite formation is sursum from sub (up from below) + vorsum, “turned upward.”
3. The Dē- Prefix Family in Botanical Descriptors
The preposition dē (down from, away from) combines with verbal roots to produce a rich set of botanical terms, many of which appear as species epithets: -
decurrens, -entis (present participle of decurrō): “running down.” Used especially of leaf bases that extend downward along the stem as a wing or ridge. Example: Calocedrus decurrens, the incense cedar. -
deflexus, -a, -um (past participle of deflectō): “bent downward, deflexed.” Of structures curved away from the axis in a downward direction. -
dependens, -entis (present participle of dependeō): “hanging down.” Of flowers, fruits, or branches that hang by their own weight. -
decumbens, -entis (present participle of decumbō): “lying down, prostrate with an ascending apex.” Of stems that grow along the ground with the tip rising upward. -
demersus, -a, -um (past participle of dēmergō): “submerged, plunged down.” Of aquatic plants or submerged structures.
4. Participial Agreements
When botanical terms derived from dē- function as adjectives, they must agree with the noun they describe in gender, number, and case. Present participles (decurrens, dependens, decumbens) follow third-declension patterns: folia decurrentia (neuter plural), caulis decurrens (masculine singular), radix decurrens (feminine singular). Past participles (deflexus, demersus) follow first/second-declension patterns: ramus deflexus (masc.), folia deflexa (neut. pl.), spina deflexa (fem.).
5. Ablative Absolute Constructions
Botanical diagnoses frequently use ablative absolute constructions with directional terms: sepalis basi solutis (”with the sepals freed at the base”), foliis deorsum curvatis (”with the leaves curved downward”). These are translated into English with “with...” phrases and describe attendant circumstances of the specimen.
6. Sursum et Deorsum: Paired Directional Descriptions
Botanical Latin frequently pairs sursum and deorsum to describe structures that change character along their length: deorsum cylindrica, sursum subulata (”cylindric below, subulate above”). This pattern is essential for reading complex morphological diagnoses. The pair sursum deorsum can also mean “up and down, to and fro” in classical Latin.
Common Mistakes for English Speakers: -
Attempting to decline deorsum — it is invariable -
Confusing decurrens (running down a stem) with recurrens (running back, recurved) -
Failing to make participial descriptors agree: folia decurrens is incorrect; it must be folia decurrentia -
Translating deorsum as a preposition rather than an adverb — it does not govern a noun in the way English “down” can (”down the hill”) -
Overlooking the distinction between deflexus (bent downward deliberately) and declinatus (inclined downward gently)
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
Directional terminology lies at the heart of botanical morphological description, and “deorsum” has been in continuous use from classical antiquity through to modern plant taxonomy. Cicero used the phrase ferri deorsum suo pondere (”to be carried downward by their own weight”) in his philosophical work Dē Fīnibus when discussing Epicurean atomic theory — a phrase that resonates remarkably with botanical descriptions of pendulous inflorescences and drooping branches that hang deorsum suō pondere.
Seneca employed the vivid pairing sursum deorsum (”up and down”) in his Epistulae Morales to describe the reversals of fortune, and this identical pairing became a staple of botanical description for structures that change character along a gradient. When a mycologist writes deorsum cylindrica, sursum subulata, they are using precisely the same syntactical structure that Seneca used two millennia earlier.
The prefix dē- became enormously productive in post-classical botanical Latin. Linnaeus himself used decurrens extensively in his species descriptions, and the term entered taxonomic nomenclature directly: Calocedrus decurrens (Torr.) Florin, the incense cedar of western North America, bears its epithet because the leaf bases extend downward (”run down”) along the branchlets. Similarly, Verbascum decurrens describes the winged stems created by leaf tissue running down the stem.
The Missouri Botanical Garden’s Grammatical Dictionary of Botanical Latin, compiled by specialist lexicographer H. David Hammond, provides the most comprehensive modern treatment of deorsum in its botanical applications, documenting usage from DeCandolle’s Prōdromus Systematis Naturalis through to Saccardo and Traverso’s mycological works. This resource demonstrates that deorsum was not a rare or occasional term but a fundamental element of the botanical descriptive vocabulary, appearing in descriptions across all major plant groups.
For the English-speaking biology student, the concept of “downward” in Latin descriptions opens a window into how pre-photographic botanists communicated the three-dimensional form of living organisms through precise spatial language. Where a modern field guide might include a photograph, a Linnaean diagnosis relied on words like deorsum, sursum, extrorsum (outward), and introrsum (inward) to create a verbal map of plant architecture.
Regional variation in pronunciation follows the standard botanical Latin divide: English speakers traditionally say “dee-OR-sum,” while Continental European botanists tend toward restored classical pronunciation. In either case, the meaning is universally understood throughout the international botanical community.
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
From the Grammatical Dictionary of Botanical Latin (Missouri Botanical Garden), citing Augustin Pyramus de Candolle, Prōdromus Systematis Naturalis Regni Vegetabilis (1824–1873), and Saccardo & Traverso (S&A):
Part F-A: Interlinear Construed Text
Clava (ˈkla.wa) club-NOM.SG distincta (disˈtink.ta) separate-NOM.SG.FEM alba (ˈal.ba) white-NOM.SG.FEM item (ˈi.tem) also recta (ˈrek.ta) straight-NOM.SG.FEM fistulosa (fis.tuˈloː.sa) hollow-NOM.SG.FEM elongata (eː.lonˈgaː.ta) elongate-NOM.SG.FEM deorsum (deˈɔr.sum) downwardly cylindrica (ky.ˈlin.dri.ka) cylindric-NOM.SG.FEM sursum (ˈsur.sum) upwards subulata (su.buˈlaː.ta) subulate-NOM.SG.FEM
Primo (ˈpriː.moː) at-first unicolor (uˈni.ko.lor) of-one-colour-NOM.SG dein (deːn) then sensim (ˈsen.sim) gradually deorsum (deˈɔr.sum) downwards nigrescit (niˈgres.kit) grows-dark-3SG sursum (ˈsur.sum) upwards nitorem (niˈtoː.rem) gloss-ACC.SG smaragdinum (sma.ragˈdiː.num) emerald-green-ACC.SG conservat (kon.ˈser.wat) preserves-3SG
“Clava distincta, alba, item recta, fistulosa, elongata, deorsum cylindrica, sursum subulata.” The club [fruiting body] is separate, white, also straight, hollow, elongate, cylindric downward, subulate upward.
“Primo unicolor, dein sensim deorsum nigrescit, sursum nitorem smaragdinum conservat.” At first it is of one colour; then gradually it grows dark downward, while upward it preserves an emerald-green gloss.
— Saccardo & Traverso, as cited in Hammond, A Grammatical Dictionary of Botanical Latin, Missouri Botanical Garden.
Clava distincta, alba, item recta, fistulosa, elongata, deorsum cylindrica, sursum subulata.
Primo unicolor, dein sensim deorsum nigrescit, sursum nitorem smaragdinum conservat.
This mycological passage illustrates several key features for English speakers learning botanical Latin:
The description of the clava (a club-shaped fruiting structure in fungi) is built entirely from nominative singular feminine adjectives agreeing with clava: distincta, alba, recta, fistulosa, elongata, cylindrica, subulata. Note that the verb “est” (is) is omitted — this is standard in botanical diagnoses, where the copula is regularly suppressed for conciseness.
The pairing deorsum cylindrica, sursum subulata demonstrates the directional contrast pattern: the structure is cylindric in its lower portion and awl-shaped (subulate) in its upper portion. This is one of the most characteristic constructions in botanical morphological description.
The second passage introduces an inchoative verb: nigrescit (from nigrēscō, “to become black, to darken”) — a verb that describes a process of change. The suffix -ēscō added to an adjective root creates a verb meaning “to become [that quality].” This is a highly productive pattern in botanical Latin: albēscit (becomes white), rubēscit (becomes red), viridēscit (becomes green).
The word smaragdinus (emerald-green) derives from Greek σμάραγδος (smaragdos, emerald) and is a colour term frequently encountered in descriptions of fresh fungal specimens and mosses.
These passages from Saccardo and Traverso, preserved in the MOBOT Grammatical Dictionary, represent the finest tradition of mycological Latin — precise, economical, and visually evocative. The description of a fruiting body that changes colour in a gradient from below (darkening) to above (preserving an emerald lustre) is a masterpiece of compressed observation. In a single sentence, the writers convey information that would require a lengthy paragraph in English, demonstrating why Latin persisted as the language of botanical description well into the twentieth century and why the International Code of Botanical Nomenclature mandated Latin diagnoses until 2012.
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
The following fifteen examples present a coherent botanical field description using directional terminology centred on the concept of “downward,” demonstrating how deorsum and its related dē- prefix terms function in running morphological description typical of flora treatments and identification keys.
1.16a Caulis erectus, basi decumbens, pilis deorsum versis tectus. 1.16b Caulis (ˈkaw.lis) stem-NOM.SG erectus (eˈrek.tus) erect-NOM.SG basi (ˈba.siː) at-base-ABL.SG decumbens (deˈkum.beːns) decumbent-NOM.SG pilis (ˈpiː.liːs) with-hairs-ABL.PL deorsum (deˈɔr.sum) downward versis (ˈwer.siːs) turned-ABL.PL tectus (ˈtek.tus) covered-NOM.SG
1.17a Folia alterna, oblonga, basi in petiolum deorsum decurrentia. 1.17b Folia (ˈfo.li.a) leaves-NOM.PL alterna (alˈter.na) alternate-NOM.PL.NEUT oblonga (obˈlon.ga) oblong-NOM.PL.NEUT basi (ˈba.siː) at-base-ABL.SG in (in) onto petiolum (pe.tiˈo.lum) petiole-ACC.SG deorsum (deˈɔr.sum) downward decurrentia (de.kurˈren.ti.a) decurrent-NOM.PL.NEUT
1.18a Petala reflexa, deorsum curvata, margine revoluta. 1.18b Petala (ˈpe.ta.la) petals-NOM.PL reflexa (reˈflek.sa) reflexed-NOM.PL.NEUT deorsum (deˈɔr.sum) downward curvata (kurˈwaː.ta) curved-NOM.PL.NEUT margine (ˈmar.gi.ne) at-margin-ABL.SG revoluta (re.woˈluː.ta) revolute-NOM.PL.NEUT
1.19a Stamina sex, filamentis deorsum dilatatis. 1.19b Stamina (ˈsta.mi.na) stamens-NOM.PL sex (seks) six filamentis (fi.laˈmen.tiːs) with-filaments-ABL.PL deorsum (deˈɔr.sum) downward dilatatis (diː.laˈtaː.tiːs) widened-ABL.PL
1.20a Pedunculi nutantes, floribus deorsum spectantibus. 1.20b Pedunculi (pe.ˈdun.ku.liː) peduncles-NOM.PL nutantes (nuˈtan.teːs) nodding-NOM.PL floribus (ˈfloː.ri.bus) with-flowers-ABL.PL deorsum (deˈɔr.sum) downward spectantibus (spek.ˈtan.ti.bus) facing-ABL.PL
1.21a Fructus pendulus, deorsum versus elongatus, dehiscentia longitudinali. 1.21b Fructus (ˈfruk.tus) fruit-NOM.SG pendulus (ˈpen.du.lus) pendulous-NOM.SG deorsum (deˈɔr.sum) downward versus (ˈwer.sus) directed elongatus (eː.lonˈgaː.tus) elongate-NOM.SG dehiscentia (deː.hisˈken.ti.a) with-dehiscence-ABL.SG longitudinali (lon.gi.tuː.diˈnaː.liː) longitudinal-ABL.SG
1.22a Radix palaris, ramis lateralibus deorsum directis. 1.22b Radix (ˈraː.diks) root-NOM.SG palaris (paˈlaː.ris) taproot-NOM.SG ramis (ˈraː.miːs) with-branches-ABL.PL lateralibus (la.te.ˈraː.li.bus) lateral-ABL.PL deorsum (deˈɔr.sum) downward directis (diˈrek.tiːs) directed-ABL.PL
1.23a Inflorescentia racemosa, floribus deorsum maturantibus. 1.23b Inflorescentia (in.floː.resˈken.ti.a) inflorescence-NOM.SG racemosa (ra.keˈmoː.sa) racemose-NOM.SG.FEM floribus (ˈfloː.ri.bus) with-flowers-ABL.PL deorsum (deˈɔr.sum) downward maturantibus (ma.tuˈran.ti.bus) maturing-ABL.PL
1.24a Rami deflexi, cortice deorsum fisso. 1.24b Rami (ˈraː.miː) branches-NOM.PL deflexi (deˈflek.siː) deflexed-NOM.PL cortice (ˈkor.ti.ke) with-bark-ABL.SG deorsum (deˈɔr.sum) downward fisso (ˈfis.soː) split-ABL.SG
1.25a Stolones repentes, nodis radicantibus, surculis deorsum curvatis. 1.25b Stolones (stoˈloː.neːs) stolons-NOM.PL repentes (reˈpen.teːs) creeping-NOM.PL nodis (ˈnoː.diːs) with-nodes-ABL.PL radicantibus (ra.diˈkan.ti.bus) rooting-ABL.PL surculis (ˈsur.ku.liːs) with-shoots-ABL.PL deorsum (deˈɔr.sum) downward curvatis (kurˈwaː.tiːs) curved-ABL.PL
1.26a Corolla tubulosa, lobis deorsum reflexis, fauce constricta. 1.26b Corolla (koˈrol.la) corolla-NOM.SG tubulosa (tu.buˈloː.sa) tubular-NOM.SG.FEM lobis (ˈlo.biːs) with-lobes-ABL.PL deorsum (deˈɔr.sum) downward reflexis (reˈflek.siːs) reflexed-ABL.PL fauce (ˈfaw.ke) with-throat-ABL.SG constricta (konˈstrik.ta) constricted-ABL.SG.FEM
1.27a Capsula pendula, valvis tribus deorsum dehiscentibus, seminibus alatis. 1.27b Capsula (ˈkap.su.la) capsule-NOM.SG pendula (ˈpen.du.la) pendulous-NOM.SG.FEM valvis (ˈwal.wiːs) with-valves-ABL.PL tribus (ˈtri.bus) three-ABL.PL deorsum (deˈɔr.sum) downward dehiscentibus (deː.hisˈken.ti.bus) dehiscing-ABL.PL seminibus (seˈmi.ni.bus) with-seeds-ABL.PL alatis (aˈlaː.tiːs) winged-ABL.PL
1.28a Pili glanduliferi, apice recurvato, basi deorsum adpressi. 1.28b Pili (ˈpiː.liː) hairs-NOM.PL glanduliferi (glan.duˈli.fe.riː) gland-bearing-NOM.PL apice (ˈa.pi.ke) at-apex-ABL.SG recurvato (re.kurˈwaː.toː) recurved-ABL.SG basi (ˈba.siː) at-base-ABL.SG deorsum (deˈɔr.sum) downward adpressi (adˈpres.siː) appressed-NOM.PL
1.29a Calyx persistens, laciniis lanceolatis deorsum incumbentibus fructum amplectentibus. 1.29b Calyx (ˈka.lyks) calyx-NOM.SG persistens (perˈsis.teːns) persistent-NOM.SG laciniis (laˈki.ni.iːs) with-segments-ABL.PL lanceolatis (lan.ke.oˈlaː.tiːs) lanceolate-ABL.PL deorsum (deˈɔr.sum) downward incumbentibus (in.kumˈben.ti.bus) lying-upon-ABL.PL fructum (ˈfruk.tum) fruit-ACC.SG amplectentibus (am.plekˈten.ti.bus) embracing-ABL.PL
1.30a Planta tota indumento deorsum verso sericeo obtecta, caulibus decumbentibus, foliis basalibus dependentibus, floribus deflexis. 1.30b Planta (ˈplan.ta) plant-NOM.SG tota (ˈtoː.ta) whole-NOM.SG.FEM indumento (in.duˈmen.toː) with-indumentum-ABL.SG deorsum (deˈɔr.sum) downward verso (ˈwer.soː) turned-ABL.SG sericeo (seˈri.ke.oː) silky-ABL.SG obtecta (obˈtek.ta) covered-NOM.SG.FEM caulibus (ˈkaw.li.bus) with-stems-ABL.PL decumbentibus (de.kumˈben.ti.bus) decumbent-ABL.PL foliis (ˈfo.li.iːs) with-leaves-ABL.PL basalibus (baˈsaː.li.bus) basal-ABL.PL dependentibus (de.penˈden.ti.bus) hanging-down-ABL.PL floribus (ˈfloː.ri.bus) with-flowers-ABL.PL deflexis (deˈflek.siːs) deflexed-ABL.PL
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
1.16 Caulis erectus, basi decumbens, pilis deorsum versis tectus. “The stem is erect, decumbent at the base, covered with downward-turned hairs.”
1.17 Folia alterna, oblonga, basi in petiolum deorsum decurrentia. “The leaves are alternate, oblong, decurrent downward at the base onto the petiole.”
1.18 Petala reflexa, deorsum curvata, margine revoluta. “The petals are reflexed, curved downward, revolute at the margin.”
1.19 Stamina sex, filamentis deorsum dilatatis. “Stamens six, with filaments widened downward.”
1.20 Pedunculi nutantes, floribus deorsum spectantibus. “The peduncles are nodding, with flowers facing downward.”
1.21 Fructus pendulus, deorsum versus elongatus, dehiscentia longitudinali. “The fruit is pendulous, elongate in the downward direction, with longitudinal dehiscence.”
1.22 Radix palaris, ramis lateralibus deorsum directis. “The root is a taproot, with lateral branches directed downward.”
1.23 Inflorescentia racemosa, floribus deorsum maturantibus. “The inflorescence is racemose, with flowers maturing downward.”
1.24 Rami deflexi, cortice deorsum fisso. “The branches are deflexed, with bark split downward.”
1.25 Stolones repentes, nodis radicantibus, surculis deorsum curvatis. “The stolons are creeping, with nodes rooting and shoots curved downward.”
1.26 Corolla tubulosa, lobis deorsum reflexis, fauce constricta. “The corolla is tubular, with lobes reflexed downward, the throat constricted.”
1.27 Capsula pendula, valvis tribus deorsum dehiscentibus, seminibus alatis. “The capsule is pendulous, with three valves dehiscing downward, the seeds winged.”
1.28 Pili glanduliferi, apice recurvato, basi deorsum adpressi. “The hairs are gland-bearing, recurved at the apex, appressed downward at the base.”
1.29 Calyx persistens, laciniis lanceolatis deorsum incumbentibus fructum amplectentibus. “The calyx is persistent, with lanceolate segments lying downward upon and embracing the fruit.”
1.30 Planta tota indumento deorsum verso sericeo obtecta, caulibus decumbentibus, foliis basalibus dependentibus, floribus deflexis. “The whole plant is covered with a silky downward-turned indumentum, with decumbent stems, hanging basal leaves, and deflexed flowers.”
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
1.16 Caulis erectus, basi decumbens, pilis deorsum versis tectus.
1.17 Folia alterna, oblonga, basi in petiolum deorsum decurrentia.
1.18 Petala reflexa, deorsum curvata, margine revoluta.
1.19 Stamina sex, filamentis deorsum dilatatis.
1.20 Pedunculi nutantes, floribus deorsum spectantibus.
1.21 Fructus pendulus, deorsum versus elongatus, dehiscentia longitudinali.
1.22 Radix palaris, ramis lateralibus deorsum directis.
1.23 Inflorescentia racemosa, floribus deorsum maturantibus.
1.24 Rami deflexi, cortice deorsum fisso.
1.25 Stolones repentes, nodis radicantibus, surculis deorsum curvatis.
1.26 Corolla tubulosa, lobis deorsum reflexis, fauce constricta.
1.27 Capsula pendula, valvis tribus deorsum dehiscentibus, seminibus alatis.
1.28 Pili glanduliferi, apice recurvato, basi deorsum adpressi.
1.29 Calyx persistens, laciniis lanceolatis deorsum incumbentibus fructum amplectentibus.
1.30 Planta tota indumento deorsum verso sericeo obtecta, caulibus decumbentibus, foliis basalibus dependentibus, floribus deflexis.
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
The Genre Section demonstrates several advanced grammatical patterns essential for reading botanical morphological descriptions:
1. The Ablative of Description (Ablativus Qualitatis)
Many sentences use ablative phrases to add descriptive detail without a main verb: filamentis deorsum dilatatis (”with filaments widened downward”), cortice deorsum fisso (”with bark split downward”). These ablative absolute and ablative of description constructions are the backbone of botanical diagnosis prose. They allow the botanist to pile up descriptive features in a compressed format.
2. Multiple Dē- Prefix Terms in a Single Description
Sentence 1.30 demonstrates how several dē- prefix terms can appear together in a comprehensive plant description: decumbentibus (of stems lying down), dependentibus (of leaves hanging down), deflexis (of flowers bent downward). Each term describes a different kind of “downwardness” — prostrate growth, gravitational hanging, and angular bending respectively.
3. Copula Omission
In botanical diagnoses, the verb est/sunt (is/are) is regularly omitted. Where English would require “the stem IS erect” or “the leaves ARE alternate,” botanical Latin writes simply caulis erectus and folia alterna. This convention must be understood by the reader, as it can initially confuse English speakers who expect every sentence to contain a verb.
4. Key Directional Vocabulary Summary
For reference, here is the core directional vocabulary presented in this lesson:
Deorsum (downward) — Sursum (upward) — Extrorsum (outward) — Introrsum (inward) — Antrorsum (forward) — Retrorsum (backward) — Lateraliter (laterally) — Oblique (obliquely)
These eight adverbs, combined with the prefix families they generate (dē-, sur-/sub-, ex-, in-, etc.), constitute the spatial orientation system of botanical Latin morphological description.
5. Present vs. Past Participles as Descriptors
Present participles (decurrens, dependens, decumbens) describe ongoing states or characteristic habits: a leaf that IS decurrent, a branch that IS hanging. Past participles (deflexus, demersus, curvatus) describe completed states: a petal that HAS BEEN bent down, a structure that HAS BEEN submerged. Both function as adjectives and must agree with their noun.
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
Botanical Latin pronunciation varies between two main traditions for English speakers. The traditional English system follows the conventions established in British academic Latin: deorsum as “dee-OR-sum,” decurrens as “de-KUR-enz,” with English-style vowel values. The restored classical pronunciation, increasingly used in academic settings, pronounces deorsum as “de-OR-soom” with the final -um retaining its Latin quality.
In either system, the following orthographic points apply: the prefix dē- carries a long vowel (macron: dē-), which affects stress placement — dēcurrēns has stress on the second syllable because of the long ē. The double -rr- in decurrens should be clearly pronounced as an extended or trilled r. The letter -x- in deflexus represents the consonant cluster /ks/.
The letter v in botanical Latin (as in valvulis, versus, versis) may be pronounced either as English /v/ (traditional system) or as Latin /w/ (restored classical). Both are acceptable in botanical contexts.
All Latin diphthongs should be observed: ae in antherae (pronounced “AN-the-ree” traditionally, or “an-TE-rai” classically), oe in any relevant terms, and au in caulis (pronounced “KAW-lis”).
For audio reference, the Vox Latina recordings by W. Sidney Allen and the Latinum Institute’s own pronunciation guides provide reliable models for restored classical Latin pronunciation applicable to botanical texts.
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
The Latinum Institute Botanical Latin Reading Course teaches the Latin language as used in botanical and biological texts through a frequency-based, construed-reading methodology. Each lesson focuses on a single high-frequency English word and its Latin equivalents, building vocabulary systematically through authentic botanical examples with detailed word-by-word glossing.
This course follows the Latinum Institute’s proven methodology, developed since 2006, which prioritises reading comprehension through interlinear analysis. Students encounter the same vocabulary repeatedly in varied contexts, building recognition and grammatical understanding naturally. The 1000-word progression ensures that students master the most commonly encountered terms first.
The Latinum Institute has been creating online language learning materials since 2006. For more lessons in this series and other language courses, visit https://latinum.substack.com/p/index
For reviews of the Latinum Institute’s teaching methodology, see https://uk.trustpilot.com/review/latinum.org.uk
The botanical Latin series is particularly suited to biologists, botanists, horticulturists, gardeners, and anyone who encounters Latin nomenclature and descriptions in their study or work. By building Latin reading skills progressively, students gain the ability to read original taxonomic descriptions, herbarium labels, and historical botanical texts — a skill that remains valuable even in an era of electronic databases and machine translation.
✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾ ✾ ❦ ✾ ❦ ✾
---