292 ASCLEPIADACE^E. 



wary, mucronato, contracted lnio a short petiole ; pedicels and peduncles short, 

 downy; oroll'j. segments ovato; hoods of th > crown orbicular, entire, the horn 

 broad-falcate, with a horizontal point: follicle slightly downy. 



Dry woods. July, Aug. Stem 3 to 4 fo^t high. Lesson somewhat acuminate, on 

 pubesoent petioles. Unbelt 20 to 4) flowered, mostly globose. CorUlu and crown 

 whits, tho latter with a band of purple around thj base. 



6. A. QUADRIFOLIA, Jacq. Four-leaved Milkweed'. 



Nearly smooth; ftem simple, slender ; leaves ovato or ovate-l&ncoolate, petioled, 

 mostly acuminate, tho middle onoa in whorls of four; pedicels capillary; corolla 

 segments oblong ; hoods of the crown elliptical ovate; liorn very short, incurved;, 

 follicle linear-lanceolate, smooth. 



Dry W00J3 and hills; common. June. Stem 1 to 2 fost high. £mmi thiu, 2 

 to 4 inches long, the upper and lower ouch opposite. Umbtli 2 t > 5, on slender po- 

 dunolcs 1 to 13^ inch long. Flowers small, white or purplish, fragrant. 



6. A. ©btusifolia, Miclix. Wavy -leaved Milkweed. 



Smooth and glaucous; stem simple, erect; leaves oblong or ovate-elliptical, very- 

 obtuse, mucronato, sessile, somewhat clasping by a heart shaped base, the margins 

 wavy; umbels terminal, many-flowcrod; hoods of tho crown truncate and some- 

 what toothed at the summit, shorter than the 6lcnder subulate horn ; follide- 

 emoothish. 



Sandy woods and fields, rather common. July. Stem 2 to 3 feet high, bearing a 

 single (rarely 2) loug padnnoled terminal umbel of 30 to 40 large radish-green 

 flowers. Leaves much wived on the margin, 4 to 5 inches long, l /± as wide. Corolla- 

 light purple. Crown nearly white, the segments large. 



7. A. RUBRA, L. Red- flowered Milkweed. 



Smooth, slender, erect; leaves ov;\t;-lanccolate or oblong, acuminate, subcordato 

 or rounded at base, on very short petioles; divisions of tho corolla lanceolate ,_ 

 acute; hoods of tho crown oblong, ncutisb, with an awl-shaped horn. 



Low grounds, rare. July. Stem I to 2 feet high, with a pubescent lino on ono 

 sido, bearing 1 to 3 few-flowered umbels at the naked summit of the ntem. Leave* 

 2 to 4 inches long, rough-ciliate, in reantj pairs. Flowers reddish purple, tinged 

 with orango. 



8. A. INCARNATA, L. Rose-colored Silkweed. 



Stem erect, branching ab:>ve; leaves oblong-lanceolate, acuto or pointed, obtuso 

 at the base, distinctly pctiobd; umbels many-flowered, erect, mostly terminal, of- 

 ten in opposite pairs ; divisions of the corolla ovate; liomi awl-shaped, curving in- 

 wards. 



Wet places, common. Ju!y, Aug. Stem 2 to 3 fe?t high, very leafy, with 2 hairy 

 lines above and on tho branches and peduncles. Leaves 3 to 6 inches long, J4 to 

 1% wide, tapering to a very acute point on petioles ]/ 2 inch long. i'mlxi* close. 2 

 too togethes at tho top of the stem or branches, on a peduncle 2 inchjs long. 

 Flowers small. OoroUa reddish-purple. Crown flesh-color. 



9. A. TUB3&03A, L. Butterfly Weed. Pleurisy Root. 



JBoughish-hairy ; stems crest or ascending, very leafy, with spreading branehoi ; 

 leaves varying from linear to oblong-lanceolate, sessile or slightly pet o',od ; umbels 

 numerous, often forming terminal corymb:; hoods of the cr&wn narowly-oblong, 

 scarcely longer than the slender awl shaped horns ; fo'lides hoary. 



Dry hills and fields, common. June — Aug. Root large, tuberous. Plant Ko2 

 feet high, leafy io th; summit, usually with numerous eorymbed umbels of showy 

 orango flowers on short peduncles. Leaver, s-ometiincs broad and cordate, at others 

 linear and soincwh-.t tapering at base. Corolla greenish-orange. Croton bright- 

 orango- Modicinal. 



