Clematis ochroleuca Aiton
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Stems erect, 2–6 dm, simple or branched, ± villous-tomentose, the branches seldom overtopping the central axis; lvs subsessile, ovate, to 12 cm, half as wide (or a little wider), rather light green, softly hairy beneath when young, glabrescent in age; peduncles elongating to 5–20 cm at maturity, regularly exceeding the uppermost lvs; fls solitary and terminal, cal urceolate; sep 2–3.5 cm, densely sericeous outside; base of the achenes appressed-puberulent with short hairs, these becoming longer distally, but always erect or ascending, as are also the lower hairs of the style; mature style (3–)3.5–6 cm, densely plumose; 2n=16. In woods and disturbed open places; s. N.Y. to Ga., mostly on the piedmont. May, June.