JUGLANDACE^E. 335 



Banks of streams. N. Eng. to Virg. ; rare. April, May. \i. Pursh. A 

 doubtful species. River Elm. 



4. U-. racemosa Thomas : young branchlets pubescent ; leaves smooth 

 above, slightly and softly pubescent beneath, acuminate, doubly and unci- 

 nately serrate ; flowers in compound racemes, pedicellate ; samara elliptic- 

 oval, the margin densely fringed. 



Banks of Htreams. Ver. N. Y. and in the Western States. April. A large 

 tree ; the branches having irregular corky excrescences. Leaves obovate, ob- 

 long, often auriculate on one side. Racemes compound, 1 2 inches long; 

 pedicels solitary, or 2 4 together. Perianth 78 cleft. Stamens 7 10. De- 

 scribed and figured by David Thomas, Esq. , in Sittiman's Journal, xix. 170. 



Thomas's Elm. White Elm. 



2. CELTIS. Linn. Nettle Tree. 

 (An ancient name of the Lotus, applied to this tree.) 

 Polygamous. STERILE FL. Perianth 5 6 -parted. Stamens 

 5^6. PERFECT FL. Perianth deeply 5-parted. Stigmas 2, 

 elongated, spreading. Drupe globose, 1 -seeded. 



1. C. occidentalis Linn. : leaves ovate, acuminate, equally serrate, un- 

 equal at base, scabrous above, hairy beneath ; flowers small, subsolitary. 



Woods. Can. to Car. W, to Miss. May. A tree 2060 or 70 feet high. 

 Leaves 2 5 inches long, at length coriaceous. Flmvers small, greenish-white, 

 solitary or in pairs. Drupe nearly globose. Sugar Berry. Beaver Wood. 



2. C. crassifolia Lam. : leaves lance-ovate, acuminate, unequally serrate, 

 rough and hairy on both sides, unequal and subcordate at the base ; pe- 

 duncles mostly 2-flowered. 



Low grounds. Penn. W. toTenn. May ? A tree 30 50 feet high. Leaves 

 3 6 inches long. Flowers often in pairs on a common peduncle. Drupe round, 

 about as large as a pea, black when ripe. Mich. Darlingt. 



Hoop Ash. Hack Berry. 



ORDER CXXII. JUGLANDACE^E. WALNUTS. 



Flowers monrecious, imperfect. STERILE FL. in aments. 

 Perianth adherent to a scale-like bract, unequally 2 6 -parted. 

 Stamens 3, or numerous. FERTILE FL. few, clustered or in 

 loose racemes. Perianth adherent to the ovary ; the limb 

 minute, 3 5 -parted ; rarely double, the inner of 3 5 minute 

 leaves. Ovary 2 4-celled below, 1-celled above; styles 12, 

 very short ; stigmas 2 4, unequal. Fruit drupaceous, the 

 pericarp fibrous-fleshy or coriaceous ; nut opening or separating 

 from a 2-valved or valveless stone, which is 2 4-celled at base, 

 and 1-celled at the apex. Seed without albumen, 2- or 4-lobed ; 

 cotyledons fleshy and oily. Trees, with alternate pinnate leaves 

 destitute of stipules. 



