Asclepias. ASCLEPIADACE^I. 475 



nate with the anthers ; the 10 pollen-masses, therefore, hanging in pairs from the 

 five glands, extricated from the cells only by the agency of insects, being carried 

 away along with the glands (generally by their legs). Ovaries with short styles, 

 the tips of which readily separate from the massive common stigma (to the under 

 side of which the pollen-tubes are directed). Follicles ovate or lanceolate. Seeds 

 numerous, flat, downwardly imbricated all over the large and soon detached pla- 

 centa ; the upper end with a long tuft of down (coma). Embryo large, with broad 

 flat cotyledons in thin albumen. — -Perennial (American) herbs; with copious milky 

 juice and tough bark, and numerous flowers in umbels, the peduncle generally 

 between the opposite leaves: involucre a whorl of small usually subulate bracts. 

 Flowering in summer. (Comparatively few species west of the Uocky Mountains, 

 very few west of the Sierra Xevada.) 



* Hoods erect, broadening upward, tioice the length of the stamens and stigma, the 



horn short from near its summit. 



1. A. subulata, Decaisne (?). Glabrous, pale or glaucous : branches rigid and 

 rush-like, leafless, or with a few terete subulate or filiform leaves above : umbels race- 

 mose, short-peduncled : pedicels and ovate sepals cinereous-pubescent when young : 

 lobes of the greenish-white corolla oblong-ovate, a third of an inch long : hoods a 

 little elevated on the column of united filaments, purplish, 3 or 4 lines long, undu- 

 late and somewhat 3-toothed at the apex, crested through the middle, the crest 

 terminating near the summit in a short and subulate nearly included horn : folli- 

 cles lanceolate, smooth. — Torr. Bot. Mex. Bound. 164. 



Below San Diego along the Lower Caliibrnian boundary line, Parry, Cleveland. Ravines on 

 the lower Rio Colorado, Schott, Cooper, Palmer. The peduncles are not reflexed : otherwise the 



specimens accord with Decaisne's brief character, taken from a plant in Tavon's collection. 



* * Hoods spreading, tapering upward, more than twice the length of stamens and 



stigma, the horn projecting from near its base. 



2. A. speciosa, Torr. Soft-tomentose, or smoother when old : stem stout, 2 f 

 4 feet high, leafy to the top: leaves opposite, ovate or oblong-ovate, almost sessile, 

 acute or pointed, t to 6 inches long : peduncle longer than the numerous woolly 

 pedicels: Bowers dull reddish-purple : hoods longer than the corolla, abruptly con- 

 tracted above the short involute base or body into the long ami nearly flat lanceo- 

 late portion : column of filaments hardly any : follicles ovate-acuminate, densely soft- 

 spiny and woolly. — Ann. Lye N. York, ii. 218. A. Douglasii, Book. Fl. ii. 53, 

 t. 142, & Bot. Mag. t. 1413. 



In the Sierra Nevada (Yosemite Valley, /Inlander, to Plumas Co., itrs. Pulsifer Ames, fcc.l : 

 common through Oregon, and eastward to the plains east of the Uocky .Mountains. Hoods at 

 length half an inch long. Pods i inches long, resembling those of A. Cornuli, the common Milk- 

 weed of the Atlantic States. 



* * * Hoods erect or ascending, not exceeding ih< stamens and stigma, 



+. Ovate, obtuse, entire, comparatively small ; Hie exserted horn rising from below its 

 middle: flowers small and numerous: leaves narrow. 



3. A. fascicularis, Decaisne. Glabrous, slender, 3 to 5 feet high: leaves in 

 whorls of -1 to .">, or the lower and uppormosl opposite, sometimes also with fas 



cf^ cicles in the axils, linear and linear-lanceolate, slightly petioled (2 to 5 inches long. 

 1 to 6 lines wide): peduncles slender, often in whorls: pedicels and calyx com 

 monly puberulent: Bowers white or whitish : loins of the corolla oblong (2 lines 

 Long): column of filaments half as long as the anthers: horns longer than the 

 1 1, mbulate, and con pii u mslj incurved over the summit "I the stigma 1 follicles 



