132 PENTANDRIA.— DIGYNiA. 



3. S. Soda : herbaceous, smooth ; branches ascending ; 

 leaves semiterete, rather acute ; fructiferous calyx 

 transversely carinate in the middle, somewhat mem 

 branaceous. 

 HAB. New- York. + 



199. ULMUS. Elm. Ulmacece. 



I. U. americana : branches smooth; leaves somewhat 

 doubly serrate, unequal at the base ; serratures un~ 

 cinately acuminate ; flowers pedicellate ; fruit fim- 

 briate. 

 HAB. Woods. April. A large tree ; bran, long, re- 

 curv. ; leav. altern. ; fl. purplish, small appearing 

 before the leav. 

 :. V. fulva : leaves oval-oblong, much acuminate, pu- 

 bescent on both sides ; buds tomentose ; flowers 

 sessile. 

 HAB. Rocky hills. April. Tree 20—25 ft. high ; 

 fl. conglom., ciliate ; stam. 7. 

 3. U. nemoralis: leaves oblong, somewhat smooth, 

 equally serrate, nearly equal at the base ; flowers 

 sessile. 

 HAB. River banks. -\-. 



200. CELTIS. Nettle-tree. Ulmaceaa. 

 I. C. occidentalis : leaves ovate, acuminate, equally ser- 

 rate, unequal at the base, scabrous above, pubes- 

 cent beneath ; flowers subsolitary. 

 HAB. Woods. May. Tree middle-sized; leav. 



altern. ; fl. small, greenish-zvhite ; drupe purp. 

 ■'. crassifolia: leaves ovate, acuminate, unequally 

 serrate, subcoriaceous, scabrous on both sides, un- 

 equal at the base ; peduncles mostly 2-flowered. 

 HAB. River banks. Tree smaller than JVo. 1. 

 >. C.pumila: leaves ovate, acuminate, equally serrate, 

 unequal at the base ; the younger ones only pubes- 

 cent ; peduncles mostly 3-flowercd ; fruit solitary 

 HAB. Batiks of rivers. 



201. ERYNG1UM. Eryngo. Umbelliferaz. 



\ . E. aquaticum : leaves linear-lanceolate, remotely 

 ciliate-spinous ; inferior ones ensiform, those of 

 the flowers lanceolate, dentate ; involucrum shorter 

 than the globose capitulum, entire, as are also thr 

 scales of the receptacle : stem subdichotomous. 



