116 FAM. 146. 



2. Hoods without horn-like processes, -------- 3 



2. Hoods with horn-like processes, ----- Asclepias, Milk-weed 



a. Flowers orange to yellow, ------ __b 



a. Flowers whitish, greenish or purplish, ------ c 



b. Stem hirsute, erect or ascending, branched; leaves alternate; 

 umbels numerous and many- flowered; — leaves lanceolate-ob- 

 long to linear; corolla-lobes narrowly oblong, greenish or red- 

 dish orange; crown with linear hoods, orange, rarely yellow. 

 Dry fields. Summer and Fall. 



A. tuberosa, Butterfly-weed, Pleurisy-root 



b. Stem smooth, tall, mostly simple; leaves distant; umbels few 



and few-flowered; — leaves lanceolate to oblong-linear; cor- 

 olla-lobes oblong, reddish purple; crown with oblong hoods, 

 orange. Swampy ground. Summer. - A. lanceolata (paupercula) 



c. Leaves oblong or elliptic, sessile, clasping; — stem smooth; leaves 



opposite; umbels loosely many-flowered; corolla-lobes green- 

 ish or greenish purple; crown with slightly gibbous hoods, 

 flesh-colored or reddish. Sandy soil. Spring and Sum- 

 mer. ------ A. amplexicaulis (obtusifolia) 



c. Leaves ovate to lanceolate, narrowed into a petiole, - d 



c. Leaves linear to filiform, -_---_--_e 



d. Stem hirsute-pubescent, branched, and very leafy at the top; 



umbels numerous and many-flowered, corymbose; corolla 

 small, rose-purple to white, crown flesh-colored. Moist fields. 

 Summer and Fall. -------A. pulchra 



d. Stem woody at the base, smooth, chiefly simple, slender; um- 

 bels solitary or corymbose; corolla small, white tipped with 

 pink outside, crown white. Muddy ground. Spring and 

 Summer. __--_____ A. perennis 



d. Stem smooth, purplish; leaves in 3-7 pairs, the middle pairs 

 sometimes in whorls of 4; flowers in crowded globose umbels; 

 corolla whitish, crown purple. Dry shaded ground. Spring 

 and Summer. -------- A. variegata 



d. Stem stout, tomentose, cinereous; leaves opposite, with broad 



midvein; umbels 2-6 in the upper axils; corolla yellowish green, 



crown purplish. Dry ground. Summer. A. obovata 



e. Leaves opposite; — stem glabrous, erect, slender; umbels 2-6, 



few-flowered; corolla purplish outside, ash-colored within; 

 hoods of the crown whitish and purple-keeled. Dry pine- 

 land. Summer. --------A. cinerea 



e. Leaves in whorls of 3-6, or scattered; — stem glabrous or pubes- 

 cent in lines, mostly simple; umbels loosely flowered; corolla 

 greenish white; crown white to yellowish. In sterile soil. 

 Spring to Fall. --------A. verticillata 



3. Corolla oblong campanulate, lobes erect; — crown of 5 incurved pit- 



cher-shaped bodies with involute ventral margins, remote from 

 the anthers at the base of the long slender column. - - Podostigma 

 P. pedicellata (pubescens). Stem erect, rarely branched; leaves opposite, lin- 

 ear, pubescent; umbels several-flowered; corolla greenish-yellow, fragrant. 

 Pine-barrens. Summer and Fall. 

 3. Corolla rotate, lobes spreading or reflexed; — hoods involute-concave, 



