334 DICOTYLEDONOUS PLANTS. 



^ HAB. Mountains. N. Y. to Car. May. ??. Tree of smaller 

 size than the preceding. Leaves much larger, very rough. Sta- 

 mens 7. The inner bark contains a large portion of mucilage, 

 ffnd has been employed for medicinal purposes. Slippery Elm. 



3. U. ncmoralis Ait. : leaves oblong, somewhat glabrous, equally ser- 

 rate, 'nearly equal at base ; flowers sessile. 



.HAB. Banks of streams. N. Eng. to Vir. ; scarce. April. May. 

 f> . Pursh . River Elm. 



4. U. racemosa Thomas: flowers in racemes; pedicels "in distinct 

 facicles,. united -at their bases. . 



HAB. Western part of N. Y. J>. A tree with the lower branch- 

 es having irregular corky excrescences. Leaves ovate, acumi- 

 nate, auriculate on one side, doubly serrate, ' smooth above, ' 

 under side and ribs minutely pubescent. Racemes of several 

 fascicles, 1 2 1-2 inches long. Flowers pedicellate, 2 4 in a 

 fascicle. Calyx 7 8-cleft. Stamens 710. Stigmas 2, re- 

 curved. Samara ovate, pubescent, margin, densely fringed. 

 .Described and figured by David Thomas, Esq., in Silliman-'s 

 Journal, xix. 170. 



2. CELTIS. Linn. '" 



Perfect or polygamous. Perianth 5-lobed. Startieris 5* 

 subscssile. Styles 2. Drupe globose, 1-seeded.. 



Pentandria. Digynia. 



1. C. occidentaUs Linn. ; leaves -ovate,* acuminate, equally' sermte. 

 unequal at base, scabrous above, hairy beneath ; flowers small, sub- 

 solitary; . - '.' > 



HAB. Woods. Can. to Can May. 1?. A middle-sized 'tree. 

 ' Flowers small, greenish-white^ Drupe nearly globose, purple.- 

 v -' Hoop Ash. Beaver Wood. 



3/ C. crassifolia Law.: leaves ovate, acuminate, unequally serrate, 

 subcoriaceous, scabrous on both sides, unequal at the base ; peduncles 

 mostly 2-flowered. * 



HAB. Penn. Mick. W. to Miss. . May. Tp. Smaller than the 

 fonner. ' . Hack-berry. 



3. C. jfumila Pmsh ; l.eaves broad-ovate, acuminate, equally serrate, 

 unequal at the base", smooth on both sides,, the younger ones only pu- 

 bescent ; peduncles mostly 3-flowered ; fruit solitary. C. occidentals 

 var. ffumila Muhl. 



, HAB. Banks of. rivers. Md. and Vir; Pursh. May. J?. A 

 low shrub. Drupe solitary, brown and glaucous. 



' ORDER CX1II, JUGLANDE.E. DeCand. Liml 



Flowers diclinous. STERILE FL. in an amenl. Perianth 

 scaly, oblique, irregularly lobed. Stamens inserted on the 

 receptacle, indefinite (3 36) ; filaments short, distinct; an* 



