Asclepias verticillata L.

• Authority

  Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

• Family

  Apocynaceae

• Scientific Name

  Asclepias verticillata L.

• Description

  Species Description - Stems slender, erect from a cluster of fibrous roots, 2–5 dm, simple to the infl, pubescent in lines; lvs very numerous in whorls of 3–6, narrowly linear, 2–5 cm × 1–2 mm, revolute; umbels several from the upper nodes; peduncles 1–3 cm; fls white or greenish; cor-lobes 4–5 mm; hoods somewhat divergent, 1.5–2 mm, about equaling the gynostegium, their margins entire; horns subulate, much surpassing the hoods, inflexed over the gynostegium; fr slender, erect on erect pedicels, 7–10 cm; 2n=22. Fields, roadsides, upland woods, and prairies; Mass. to Fla., w. to Sask., Kans., and Ariz. June–Aug.

• Common Names

  whorled milkweed