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FutureStarrEuphorbia Snow on the Mountain OOR
Clasping Dogbane and the related Indian Hemp (Apocynum cannabinum) are very similar, the only noticeable difference is the latter typically has longer stalked leaves (but not always!). Clasping Dogbane may also grow up to 4 feet tall but is often 2 to 3 feet. In some references, Apocynum sibiricum is considered the same species as Apocynum cannabinum, but Flora of North America, our definitive reference, treats them as separate species.
It is an unpleasantly bitter stimulant irritant herb that acts on the heart, respiratory and urinary systems, and also on the uterus. Apocynum cannabinum was much employed by various Native American tribes who used it to treat a wide variety of complaints including rheumatism, coughs, pox, whooping cough, asthma, internal parasites, diarrhoea and also to increase milk flow in lactating mothers. [Apocynum album, moreApocynum album var. hypericifolium A. Gray, Apocynum cannabinum var. angustifolium (Woot.) N. Holmgren, Apocynum cannabinum var. cannabinum , Apocynum cannabinum var. glaberrimum A. DC., Apocynum cannabinum var. greeneanum (Bég. & Bel.) Woods., Apocynum cannabinum var. hypericifolium A. Gray, Apocynum cannabinum var. nemorale (G.S. Mill.) Fern., Apocynum cannabinum var. pubescens (Mitchell ex R. Br.) Woods., Apocynum cannabinum var. suksdorfii (Greene) Bég. & Bel., Apocynum dictyotum , Apocynum hypericifolium Ait.
Apocynum longifolium Greene, Apocynum pubescens Mitchell ex R. Br., Apocynum sibiricum Jacq., Apocynum sibiricum var. cordigerum (Greene) Fern., Apocynum sibiricum var. farwellii (Greene) Fern., Apocynum sibiricum var. salignum (Greene) Fern., Apocynum suksdorfii Greene, Apocynum suksdorfii var. angustifolium (Woot.) Woods., Apocynum suskdorfii Greene.Similar species: Apocynum cannabinum is incredibly similar to A. sibiricum, but that species has mostly stalkless leaves with broadly rounded to indented bases. Also quite similar is the hybrid of this species and A. androsaemifolium, A. x floribundum, except the hybrid has pale pinkish flowers, stalked leaves, inflorescence clusters that often surpass the foliage, smaller seeds (typically under 4 mm long), and shorter (up to 2 cm long) tufts of hair (coma) on the seeds. The third species in our area, A. androsaemifolium, is the least similar because it has larger flowers (0.6 - 1 cm long) on drooping stalks, the petals are obviously pinkish with spreading or recurved lobes, many of the leaves droop, the inflorescences usually extend beyond the leaves, the seeds are only up to 3 mm long, and the tufts of hair (coma) on the seeds are shorter (up to 2 cm long). (Source: swbiodiversity.org)