PENTANDHIA.— DIGYNIA. 126 



vppos., ovate, acuminate; fl. corymb, dark purp. ; 

 seg. linear. §. ?. 



100. GONOLOBUS. Apocinece. 



1. G. obliquus : stem climbing, hairy; leaves ovate- 



cordate ; villous, acute ; corymbs axillary ; seg- 

 merits of the corolla ovate, acuminate, oblique> 

 revolute. 

 IIAB. Moist rocks. July. U . Leav. veined ; co- 

 rymbs short ; fl. foetid, dark-purp. 



2. O. hirsutus : sarments and petioles very hairy; 



leave? cordate-oval, distinctly acuminate, pubescent 

 on both sides ; segments of the corolla oblong, 

 obtuse ; follicles oblong, muricate. 

 IIAB. Hedges, near rivulets. U- Trailing or 

 climbing; umb. 4 — 6-fl. ; pet. dark-purp,; fol. 

 with soft spines. 



191. ASCLEPIAS. Silk-weed. Asclepiadex. 

 * Leaves opposite. 



\. A. syriaca : stem subsimple ; leaves lanceolate- 

 oblong, petiolate, tomentose beneath ; umbels nod- 

 ding ; nectary bidentate ; follicles muricate. 

 IIAB. Sandy fields, &c. July— Aug. V-. Stem 

 2— Aft. high; umb. 2—3, lb— 20-fl. ; fl. large, 

 pale- pur p. 

 .'■ A. phytolaccoides : stem erect, simple ; leaves broad- 

 lanceolate, acuminate, smooth, pale beneath ; um- 

 bels many-flowered, lateral and terminal, solitary, 

 on long peduncles, nodding ; nectary bidentate. 

 IIAB. Shady wet places. June — July. U. Stem 

 3 — 4 ft. high; leav. large; umb. 6 — 10-fl. ; fl. 

 greenish-pur p. 

 :\. varieguta : stem simple, erect; leaves ovate, 

 petiolate, smooth ; umbels lateral and terminal, on 

 short peduncles, crowded ; pedicels tomentose : 

 horn broad-falcate. 

 HAB. Woods. July. if. Stem 3—4 ft. high 

 pubes. above; umb. mostly 2, ^0 — 30-fl. white, 

 rarely purplish. 

 r. A. obtusifolia : leaves amplexicaul, oblong, obtuse, 

 undulate, very smooth, glaucous beneath ; umbel 



