Jepson eFlora: Key page
Vascular Plants of California
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 , generally with 5 free or fused, ± elaborate appendages abaxially; anthers fused into anther  around and fused to pistil head; pollen removed in pairs of pollinianectaries 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 stem twining ..... ARAUJIA

5' Filament column appendage margins converging and meeting or nearly meeting adaxially (to form hood); flowers in umbel-like cymes; stem  to  ..... 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 glabrousstamens attached near top of corolla tube, near level of stigma

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

7' Leaves  to subopposite; plant erect or sprawling

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

8' Corolla purple-blue (white), tube ; 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 treeleaves generally  or subwhorled (opposite); nectaries 0; sap not milky ..... NERIUM

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

10. Leaves, stemsroots not fleshy; flower < 8 mm, in generally >> 6-flowered ; 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


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Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, [accessed on ]

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