374 D10ECIA.— HEXANDKIA 



II AB.- Fields and dry wood:*. June. Climbing 

 stem subang. ; petiol. 5 — G lin. long. 



1. S. Pseudo-china: stem unarmed; leaves unarmed, 



those of the stem cordate, of the branches ovate- 

 oblong, 5-nerved ; peduncles very long. 



HAB, Pine barrens and sandy fields. June. Root< 

 large, tuber. ; stem climb. 

 b. S. laurifolia : prickly ; branches unarmed ; leaves 

 coriaceous, elliptical or elliptical-lanceolate, ob 

 tuse, slightly acuminate, shining, 3-nerved ; um- 

 bels on short peduncles. 



HAB. Pine barrens. July. Stem with few -prickles ■ 

 leav. very thick, smooth* 



6. S. pandurata : prickly; leaves ovate-panduri- 



form, acuminate, 3-nerved ; common peduncle 

 twice as long as the petiole. 

 HAB. Sandy woods. July. Leav. smooth and 

 shining. A var. of the preceding ? 



* * Stems herbaceous, unarmed. 



7. S. herbacea : stem slightly angled, erect ; leaves 



5 — 7-nerved, acuminate, pubescent beneath, the 

 lower ones alternate, upper verticillate and 

 crowded ; peduncles very long, compressed. 



HAB. Moist shady places. June. Stem 2—3 ft. 

 high, nearly simp. ; ber. black, 

 o. S. peduncularis : stem terete, climbing; leaves 

 ovate, nearly round, cordate, acuminate, 9-nerved ; 

 umbels on very long peduncles. 



HAB. Low grounds. June. Stem climb, by ten- 

 drils, 5 — Bft. high ; leav. smooth ; fl. fetid. 



533. DIOSCOREA. Yam. Asparagex. 



J. D.villosa: leaves alternate, opposite and verticil 

 late, cordate, acuminate, pubescent beneath, 9 

 nerved, the lateral nerves simple. 

 HAB. Hedges and woods. June. 11. Climbing. 

 sler.fl. in axill. panic, small. 



2. D. quaternata : leaves verticillate by fours, and al- 



ternate, cordate, acuminate, smooth on both sic!c<. 

 7-nerved : the lateral nerves divided. 

 HAB. Dry soils. June. U. Climbing: leav. 

 longer acum. than the preceding. 



