404 JUGLANDACEAE 
2. HICORIA RBaf. Bark close or m Pith solid. Leaflets involute 
in vernation. Staminate aments branched. nther-connectiye inconspicuous. 
[Carya Nutt.]—About 18 species, natives of eastern North America and 
Mexieo.—Many of the hickories furnish a very hard and tough valuable wood. 
The fruits furnished a valuable food supply for the aborigines and are ex- 
tensively used by the white-man. The bark is used medicinally, and it 
furnishes the flavoring ice * ómapleine, ?? a a yellow dye.—Spr.— 
HICKORIES. 
Cotyledons entire or merely notched at the apex: nut terete or slightly flattened, 
celled below, the shell smooth and even. (Subgenus I. PECAN.) I. PECANES. 
Cotyledons deeply 2-lobed: nut markedly Mns 4-cell oe below, 
the ] uneven or slightly corruga Subgenus II. 
EUHICORIA. 
Bud-scales valvate: blades of the lateral leaflets narrow and 
faleate, except in H. cordiformis latifolia where they may 
be broadly ovate. 
nie imbricate : blades of the lateral leaflets broad, not 
cate. 
Husk of the fruit (involucre) splitting freely and 
promptly to the base, the valves mostly woody or uL III. OvATAE. 
Husk of the fruit (involucre) splitting rather tardily 
about the middle, the valves firm-leathery. IV. GLABRAE. 
II. AQUATICAE. 
I. 
Leaflets 5—9 ; blades of the lateral ones not faleate: nut with an exceedingly thick 
shell: stami nate aments usually in 3’s on a slender 
peduncle. 1. H. 
Leaflets usually more than 9; blades of the lateral ones 
falca E nut with a thin shell: staminate aments 
myristicaeformis. 
fasci 
Lateral leaflets RU manifestly stalked blades: nut 
terete : 2. H. Pecan. 
m jen fete: With sessile or nearly sessile blades: 
somewhat flattened : seed bitter. . H. texana. 
II. AQUATICAE 
Leaflets mostly more than 9; blades glabrous: nuts cor- . 
rugated: bark of trunk flaky. H. aquatica. 
Leaflets mostly fewer than 9: blades pubescent beneath- . . 
nuts smooth: bark of trunk close. H. cordiformis. 
III. OvATAE 
Bark of the trunk rough, but close or with thin flaky 
plates. 
Leaves permanently more or less pubescent; leaflets 
1—9: fruit over 3 cm. in diameter. 6. H. alba. 
Leaves SIABEOBE- leafiets 5-7: fruit less than 3 em. 
in diameter 17. H. microcarpa. 
Bark of the 1 runi shaggy, separating in long flat plates. 
Leaflets Li 9, 2 wo b: twigs pale-orange: 
fruit 7—9 c n diamete 
Leaflets 3-5, or individually 7 : twigs red-brown : fruit 
Anthers pubescent : “blades of the lower pair of 
leaflets ovate to elliptic-lanceolate, acute or 
short- AA 9. H. ovata. 
Anthers glabrous: blades of the lower pair of 
leaflets narrowly lanceolate to linear-lanceolate, 
long-acuminate. 0. H. carolinae- 
laciniosa. 
by 
septentrionalis. 
IV. GLABRAE 
Fruit large, 3—4 c n diameter 
Leaf-rachis ind. leaflets. Pian cist blades of the leaf- 
: Ai shining above: inner bud-scales densely pubes- 
1i. H. austrina. 
Leaf-rachis or leaflets, or both, pubescent: blades of i 
the leaflets dull above: inner bud-scales puberulent. 12. H. pallida. 
