418 JUGLANDACEiE. (WALNUT FAMILY.) 



2-celled, adnate to the truncated connective. Ovaries numerous, obeoni- 

 cal, hairy at the base. Ovules 1-2, orthotropous, pendulous. Style sub- 

 ulate. Nut 1-seeded. Seed cylindrical. Embryo in the axis of scarce 

 fleshy albumen. — Flowers intermixed with copious club-shaped scales. — 

 Consisting of the single genus. 



1. PLATANUS, L. Plane-Teek. Stcamoee. 



I. P. oeeidentalis, L. — Leaves (4'-9' wide) round-cordate, angularly 

 lobed and toothed, covered when young with dense whitish down, soon smooth ; 

 stipules toothed ; heads pendulous (8''- 12" in diameter) — River-banks, Plor 

 ida, and northward. March and April. — A large tree, with the white bark 

 separating in thin plates. 



Oeder 127. JUGLANDACEiE. (Walnut Family.) 



Trees, with alternate odd-pinnate exstipulate leaves and monoecious 

 apetalous or minutely petalled flowers. Sterile flowers in pendulous 

 aments. Calyx 2 - 6-parted, the stamens few or numerous. Fertile flow- 

 ers single or clustered. Calyx 3 - 5-parted, the tube adherent to the 

 incompletely 2 - 4-eelled ovary. Fruit drupaceous, with a bony endocarp. 

 Seed 4-lobed, without albumen, orthotropous. Cotyledons oily, 2-lobed. 

 Radicle short, superior. 



1. CAE.YA, Nutt. Hickory. Pignut. 



Aments of the sterile flowers mostly three together, on a common peduncle, 

 lateral. Calyx unequally 3-parted. Stamens 3-6. Fertile flowers terminal. 

 Calyx 4-parted. Petals none. Stigma large, 4-lobed. Nut smooth, 4 - 6-angled, 

 incompletely 4-celled ; the coriaceous epicarp (husk) partly or completely 

 4-valved. — Trees, mostly with scaly buds. Leaflets serrate. Fruit roundish. 

 * Epicarp very thick, 4-valved : seed thick, edible. 



1. C. alba, Nutt. (Shell-bark Hickory.) Leaflets 5-7 (mostly 5), 

 lanceolate-oblong, or the upper ones obovate-oblong, acuminate, pubescent be 

 neath ; fruit depressed-globose ; nut roundish, thin-shelled, compressed, 4-angled, 

 slightly pointed. — Eich woods in the upper districts, Georgia, and northward. 

 March and April. — A large tree, with shaggy and scaly bark. 



2. C. sulcata, Nutt. Leaflets 7-9, obovate-oblong, acuminate, pubescent 

 beneath; fruit oval, 4-angled above; nut oblong, thiek-shellcd, conspicuously 

 pointed, slightly compressed. — Eich woods in the upper districts of Carolina, 

 Elliott, and northward. March and April. — A large tree, with scaly hark. 



3. C. Olivseformis, Nutt. (Pecan-xut.) Leaflets 13-1.5, lanceolate- 

 oblong, serrate falcate, acuminate ; nut olive-shaped, smooth, thin-shelled, some- 

 what 4-angled. — Eiver-bottoms, Mississippi, northward and westward. — A 

 large tree with smoothish bark. 



