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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

APOCYNUM DOGBANE, INDIAN HEMP

Thomas J. Rosatti & Lauramay T. Dempster


Perennial herb, ascending or erect. Leaf: opposite. Inflorescence: generally cyme, >> 6-flowered. Flower: < 8 mm; corolla bell- or urn-shaped to cylindric, 5-lobed, with 5 triangular appendages alternate stamens; filaments free, attached at base of corolla tube, unappendaged, short, broad, anthers forming cone around and adherent to stigma, each partly sterile, sharply sagittate, pollen ± free; nectaries 5, free, around but not exceeding ovaries; ovaries free, not adherent, style ± 0, stigma massive, ovoid, obscurely 2-lobed. Fruit: slender, cylindric, pointed. Seed: with tuft of long hairs at 1 end.
7 species: North America. (Greek: away from, dog, from ancient use as dog poison) 2 geographically overlapped but ecologically different species in California, many hybrids between them, many of these named.
Unabridged note: 2 geographically overlapped but ecologically different species in California, many hybrids between them. Of many names proposed for these, some (e.g., Apocynum androsaemifolium var. glabrum Macoun; Apocynum medium Greene var. floribundum (Greene) Woodson; Apocynum pumilum (Gray) Greene; Apocynum pumilum var. rhomboideum (Greene) Beg. & Bel.) applied to plants more like Apocynum androsaemifolium, others (e.g., Apocynum cannabinum var. glaberrimum A. DC.; Apocynum sibiricum Jacq. var. salignum (Greene) Fern.) to plants more like Apocynum cannabinum; none here accepted since extent of such subdivision ± limitless.

Key to Apocynum

1. Plant 1.6–3 dm; leaf drooping to spreading, ovate to round, dark green adaxially, often pale abaxially; corolla red-purple or pink to white, pink-striped or not, lobes spreading to recurved; calyx << corolla tube ..... A. androsaemifolium

1' Plant 3–12 dm; leaf ascending, lanceolate to narrow-ovate, yellow-green adaxially, abaxially; corolla ± green or white, lobes ± erect; calyx ± = corolla tube ..... A. cannabinum

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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].
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