Vincetoxicum hirundinaria Medik.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Apocynaceae
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Scientific Name
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Description
Species Description - Slender, suberect or ± twining or scrambling; peduncles 1–3 cm; cor ochroleucous to maroon or pinkish, its lobes lanceolate, 2.5–4.5 mm, half as wide, glabrous, scarcely fleshy; corona deeply 5-lobed; 2n=22; otherwise much like no. 1 [Vincetoxicum nigrum (L.) Moench], for which it is often mistaken. Native of Europe, occasionally intr. into thickets and waste places in our range. June– Sept. (? V. medium and Cynanchum medium, the former name illegitimate)
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Common Names
white swallow-wort