JUGLANDACE^. 335 



Banks of streams. N. Eng. to Virg. ; rare. April, May. T^. — 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- 

 Ipval, the margin densely fringed. 



Banks of streams. 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 7 — 8 cleft. Stamens 7 — 10. De- 

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



Thomas's Elm. White Elm 



2. CELTIS. i^z?m.— 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 ; flowrers small, subsolitary. 



Woods. Can. to Car. W. to Miss. May.— A tree 20—60 or 70 feet high. 

 Leaves 2 — 5 inches long, at length coriaceous. Floviers 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 basej pe- 

 duncles mostly 2-flowered. 



Low grounds. Penn. W. to Tenn. 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^.— Walnuts. 



Flowers monoecious, 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, l-celled above ; styles 1 — 2, 

 very short ; stigmas 2 — 4, unequal. Fruit dinipaceous, the 

 pericarp fibrous-fleshy or coriaceous ; nut opening or separating 

 from"^ 2 -valved or valveless stone, which is 2 — 4-celled at base, 

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

 cotyledons fleshy and oily. — Trees, with alternate pinnate leaves 

 destitute of stipules. 



