Jepson eFlora
Key to families | Table of families and genera

Key to Apocynaceae

View taxon page for Apocynaceae

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Filaments fused into filament column, generally with 5 free or fused, ± elaborate appendages abaxially; anthers fused into anther head around and fused to pistil head; pollen removed in pairs of pollinia; nectaries in stigmatic chambers (genera formerly treated as Asclepiadaceae)

2. Filament column ± without appendages ..... Funastrum utahense

2' Filament column with appendages

3. Filament column appendages fused into 5-lobed, cup- or plate-like structure around anther head ..... MATELEA

3' Filament column appendages free

4. Filament column appendages hollow (possibly due to complete fusion of margins); ring of tissue at base of corolla present ..... FUNASTRUM

4' Filament column appendages solid (margins converging, nearly meeting or not, not fused); ring of tissue at base of corolla 0

5. Filament column appendage margins converging but not nearly meeting abaxially; flowers in raceme- or panicle-like cymes; stem twining ..... ARAUJIA

5' Filament column appendage margins converging and meeting or nearly meeting adaxially (to form hood); flowers in umbel-like cymes; stem prostrate to erect ..... ASCLEPIAS

1' Filaments free, unappendaged; anthers free, lying against, adherent to pistil head or not; pollen ± free, not removed in pollinia; nectaries 0 or near ovaries (genera formerly treated as Apocynaceae)

6. Seed glabrous; stamens attached near top of corolla tube, near level of stigma

7. Leaves alternate to subwhorled; plant erect ..... AMSONIA

7' Leaves opposite to subopposite; plant erect or sprawling

8. Corolla pink, tube ± cylindric; plant erect ..... [Catharanthus roseus]

8' Corolla purple-blue (white), tube funnel-shaped; plant sprawling ..... VINCA

6' Seed with tuft of long hairs at 1 end; stamens attached at or near base of corolla tube, below level of stigma, or appearing so

9. Plant shrub, small tree; leaves generally whorled or subwhorled (opposite); nectaries 0; sap not milky ..... NERIUM

9' Plant perennial herb; leaves opposite; nectaries 5, free or fused; sap milky

10. Leaves, stems, roots not fleshy; flower < 8 mm, in generally >> 6-flowered cyme; nectaries 5, free ..... APOCYNUM

10' Leaves, stems, roots fleshy; flower > 15 mm, in 2–6-flowered cyme; nectaries 5, fused into a 5-lobed disk ..... CYCLADENIA


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.