432 ORDER LXXIX. ASCLEPIADACE.E. 



7. A. incarna'ta, (L.) Stem erect, branching, tomentose. Leave* 

 opposite, lanceolate, long, somewhat tomentose, pubescent along the 

 veins and margins. Flowers in numerous umbels, generally in pairs; 

 nectaries with subulate, exsert horns. — Purple. If. July — Aug. On 

 the banks of streams. 2 — 4 feet. 



8. A. tubero'sa, (L.) Stem erect, and decumbent, hirsute, branching 

 toward the summit. Leaves alternate, crowded, sessile, or on short 

 petioles. Flowers numerous in umbels. — Orange. 2f Sandy soils. 



Pleurisy-root. Butterfly-weed. 



9. A. parvifo'lia, (L.) Stem erect and decumbent, slightly pubes- 

 cent. Leaves opposite, lanceolate, acuminate, tapering at the base, 

 slightly pubescent, silky on the upper surface, on short petioles. Flow- 

 ers in axillary and terminal umbels. Horns of the nectary long. — 

 White. U. May— Aug. 1—2 feet. 



10. A. pauper'cula, (Mich.) Stem erect, glabrous, marked by a de- 

 current, hairy line. Leaves opposite, linear-lanceolate, long, glabrous, 

 margins pubescent. Flowers in umbels, on long peduncles. — Bright 

 purple. If. May — July. Damp saudy soils. 3 — 4 feet. 



11. A. angustifo'lia, (Ell.) Stem pubescent, terete. Leaves alter- 

 nate, slightly pubescent, long, strap-shaped. Flowers in terminal um- 

 bels. Horns of the nectary included. — Dull white. 11. May — June. 

 Pine-barrens. 8 — 16 inches. A. Michauxii. 



12. A. cixe'rea, (Walt.) Stem erect, slender. Leaves long, linear, 

 opposite, glabrous, upper ones minute. Flowers in terminal umbels. 

 Horns of the nectary exserted. — Dull white, variegated. U. June — 

 July. Pine-barrens. 2 — 3 feet. 



13. A. verticilla'ta, (L.) Stem erect, slender. Leaves hairy, linear, 

 crowded at the base, verticillate in the middle, opposite toward the 

 summit of the stem. Flowers in axillary and terminal umbels. Horns 

 of the nectary exserted. — Dull white. If. May — Aug. In rich soils. 

 2—3 feet. 



14. A. obova'ta, (Ell.) Stem erect, tomentose, terete. Leaves oppo- 

 site, nearly sessile, obovate, obtuse, mucronate, tomentose on the under 

 surface ; the upper ones smaller and lanceolate. Flowers in terminal 

 and axillary umbels, nearly sessile. — Middle Geo. 2 — 3 feet. 



15. A. laurifo'lia, (Mich.) Stem erect, glabrous, marked by a de- 

 current hairy line. Leaves sessile, opposite, ovate, tapering at the sum- 

 mit, glabrous. Flowers in axillary and terminal umbels ; peduncles 

 long. Corolla green on the outer surface. — Purple. If . June — July. 

 Damp pine-barrens. 2 feet. 2'oxicarpus laurifolia. 



The root of the A. tuber osa is highly esteemed throughout the Southern States as 

 a valuable remedial agent It is a diaphoretic and expectorant, and is employed in all 

 affections of the lungs, dysentery, rheumatism, and pleurisy, and it is said with great 

 benefit in all of these cases. 



Genus V.— SCUTE'RA. Rich. 

 (In honor of the botanist Scuter.) 



Calyx 5-leaved ; sepals lanceolate, acute. Corolla sub-rotate ; 

 tube short, deeply 5-parted ; lobes acute, smooth. Starnineal 

 crown 5-leaved ; leaves erect, somewhat fleshy, flat. Masses of 

 pollen ovoid, subventricose, attached by the apex. Follicles 

 smooth, slender. Seeds comose. 



