Asclepias patens N.E.Br.

Stem solitary, erect, 1-1 3/4 ft. high, slender, puberulous on the upper part, glabrous below; leaves in 5-9 pairs, subsessile, widely spreading or slightly drooping, or the upper erect from a broadly curved base, 3-4 3/4 in. long, 1-4 lin. broad, linear, attenuate-acute, truncate or subhastate at the base, minutely scabrous above and on the midrib of the paler underside; umbels 3-5, lateral at the nodes and terminal, lower racemosely, upper corymbosely arranged, 4-6-flowered; peduncles usually 3-5 lin. long, adpressed-puberulous; pedicels 1/2-3/4 in. long, slender, adpressed-puberulous; sepals about 1 1/2 lin. long, lanceolate, acute, puberulous; corolla-lobes reflexed, 2 1/2-2 3/4 lin. long, 1 3/4-2 lin. broad, elliptic or elliptic-ovate, subacute, glabrous on both sides, white on the inner face, dark purple-brown at the apical part on the back; corona-lobes arising 1/3-1/2 lin. up the staminal column, compressed-cucullate, 1-1 1/4 lin. long and 1 1/2 lin. broad across the side at the top (including the teeth), somewhat quadrate in side view, with an outwardly descending truncate base, subtruncate at the top, with the dorsal apex slightly produced but not ascending to so high a level as the inner apical angles, which are produced over the style-apex into long falcate acute teeth, below which on each margin is a narrow wing ending in a minute erect tooth, the back and base apparently narrowly wing-or keel-margined on each side, no tooth or process within, white, or perhaps tinged with pink; staminal column about 1 1/2 lin. long; anther-appendages small, about 1/3 lin. long and broad, suborbicular, inflexed upon the margin of the slightly depressed-truncate style-apex.