Clematis occidentalis (Hornemann) A.P. de Candolle var. occidentalis . Subgenus: Atragene. Phen: May-Jun. Hab: Rocky slopes over mafic rocks (greenstone, amphibolite), known positively in NC only from amphibolite peaks in Ashe County. Dist: Var. occidentalis is widespread in ne. North America, from NB west to w. ON, south to NJ, DE, OH, nw. IL, and ne. IA, and in the mountains to w. VA and w. NC.
Origin/Endemic status: Native
Other Comments: Two other varieties occur in the Rocky Mountains. Fernald's var. cacuminis, published under C. verticillaris, described plants from the mountains of VA and NC; it is apparently merely a form based on material in early flower (Pringle 1971).
Synonymy: = FNA3, K1, K3, K4, NY, Pa, Va; = Clematis occidentalis (Hornem.) DC. ssp. occidentalis – NE; < Atragene americana Sims – S; < Clematis occidentalis (Hornem.) DC. – C, Il, Mi, W; < Clematis verticillaris DC. – G, RAB; > Clematis verticillaris DC. var. cacuminis Fernald – F; > Clematis verticillaris DC. var. verticillaris – F