418 JUGLANDACE^E. (WALNUT FAMILY.) 



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

 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-TREE. SYCAMORE. 



1. P. OCCidentalis, 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, Flor- 

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

 separating in thin plates. 



ORDER 127. JUGLANDACE^J. (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-celled ovary. Fruit drupaceous, with a bony endocarp. 

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

 Radicle short, superior. 



1. CABYA, Nutt. HICKORY. PIGNUT. 



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

 lateral. Calyx unequally 3-parted. JStamens 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. O. 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. Rich 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, thick-shelled, conspicuously 

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

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



3. C. oliv8Bformis, Nutt. (PECAN-NUT.) Leaflets 13-15, lanceolate- 

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

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

 large tree with smoothish bark. 



