JOIOECIA, OCTANDRIA. 239 



subliirbinate, 5 to 8-parted, 3 to 5 of the seg- 

 ments interior. Stamina 6 to S, (rarely 3.) Fem. 



spiny trees, spines very larg-e, mostly axillary; prima- 

 ry leaves pinnate, succeeding ones bipinnate; flowers ax- 

 illary, racemose, male flowers crowded; legume mostly 

 long and falcate, multilocular^ in G. monosperma 1-seed- 

 ed. 



Species. 1. G triacajUhos. Obs. A very deceptive tri- 

 vial nanie, the spines being not only trifid but often irre- 

 gularly md numerously compounded. The specific cha- 

 racter of G. horrida, of China, " trunk spiny; spines 

 branched," is a familiar appearance of G. triacanthos in 

 the United States; the unimportant character of spines 

 in this genus is sufl&ciently evident in the ordinary occur- 

 rence of individuals of this species entirely without 

 them. 2. monosperma. A smaller tree than the prece- 

 ding. 



Of this'genus there appears to be another species indi» 

 genous to India and China. 



Order VIII.— OCTANDRIA. 



96. POPULUS. L. (Poplar.) 



Masc, Anient c^lirulric — Calix consisting 

 of lacerated scales. Coro/Za turbinate, oblique^ 

 and entire. Fem. Flower as in the male. Stig- 

 ma 4 or 6-lobtd. Capsule 2 or 3-valved, Seeds 

 beset with long wool. 



Tre; s with leaves which are roundish, or deltoidly cor- 

 date; petiole for the niost part vertically compressed to- 

 wards the summit, and partly bii>landular, buds some- 

 times baisamiferous, floral ones ear.ier tiian the leaves. 



Species. 1 !' balsamifera ( Ualsam Poplar.) 2. can- 

 (Means. 3 irep.du. 4. moniUfera. 5. hudsomca. Mich, 

 fil. P. bettdijoiia. Vn b. gr audi deii lata. jS *pendula. 

 Branches pendulous, as in the Weeping .\si). v. v. On 

 the Allf ghany I'iclge, Pennsylvania; rare. 7. Icevijata. 

 Q. angulata. ("Cotton-Tree.") Hab. Principally on the 

 alluvial banks of the the larger rivers ot western Au)erica; 

 on the banks of the JMissisippi and Missouri to their" 

 sources. 9. heterophylla. 



