4. Bud brownish; husk winged to the base, at maturity the valves completely 



separating; nut reddish-brown, furrowed or wrinkled; leaflets usually 

 more than 9, the lower surface glabrous; terminal leaflet stalked.... 



4. C. aquatica. 



5(1). Leaflets usually 5, rarely 7, the margins of young leaflet densely ciliate, 

 the older leaflet serrations with persistent tufts of hairs; branchlets 

 light reddish-brown 5. C. ovata. 



5. Leaflets 7 to 9, rarely some 5, the margins of young leaflets not densely ciliate, 



the older leaflet serrations without tiifts of hairs; branchlets pale- 

 orange 6. C laciniosa. 



1. Carya myristicaeformis (Michx. f.) Nutt. Nutmeg hickory, nogal. 



Tree to about 30 m. high, with a trunk to 6 dm. in diameter, the bark dark- 

 brown tinged with red and broken irregularly into small thin appressed scales; 

 branches stout and somewhat spreading to form a rather narrow open crown; 

 branchlets at first with lustrous scales, eventually dark-reddish-brown; leaves to 

 35 cm. long; leaflets 7 or 9, occasionally 5, short-stalked or essentially sessile, 

 ovate-lanceolate to broadly obovate, acute at apex, cuneate or somewhat rounded 

 at the narrow base, the margins serrate, to 12.5 cm. long and 37 mm. wide, thin 

 and firm, dark-green above, more or less pubescent or nearly glabrous and silvery- 

 white and lustrous beneath, becoming golden-bronze in the fall; fruit usually 

 solitary, ellipsoid to somewhat obovoid, about 35 mm. long; husk broadly 4-ridged 

 to base, coated with a yellow-brown scurfy pubescence, not more than 1 mm. 

 thick, splitting nearly to the base; nut with a thick hard and bony shell, rounded 

 and apiculate at the ends, smooth, dark-reddish-brown and marked by longitudinal 

 small broken bands of gray covering the entire surface, the dark-brown kernel 

 sweet. Hicoria myristicaeformis (Michx. f.) Britt. 



Along banks of rivers and in swamps of e. Okla. and e. Tex.; from e. S.C. to 

 e. Okla. and e. Tex.; (?) also in mts. of n.e. Mex. 



2. Carya illinoinensis (Wang.) K. Koch. Pecan, nogal morado, nuez encarce- 



LADA. 



Tree to about 50 m. high, with a massive trunk to 2 m. in diameter that is often 

 enlarged and buttressed at the base, the thick bark light-brown tinged with red 

 and deeply divided into irregular furrows and ridges; overwintering buds flattened, 

 with paired and valvate narrow scales covered with articulated hairs; branches 

 stout and spreading to form a round-topped crown; branchlets at first red-tinged 

 and coated with a loose pale tomentum. eventually glabrous or merely puberulent; 

 leaves to 5 dm. long; leaflets 9 to 17, sessile, oblong-lanceolate to lanceolate, more 

 or less falcate, acuminate at apex, cuneate to rounded at the asymmetric base, 

 the margin coarsely and often doubly serrate, to 2 dm. long and 75 mm. wide, 

 dark-yellow-green and glabrous or pilose above, pale and glabrous or pubescent 

 beneath, terminal leaflet only slightly broader than upper lateral ones; fascicles of 

 staminate aments sessile or nearly so; fruit in clusters of 3 to 11, ovoid to more 

 or less ellipsoid, pointed at apex, rounded at the narrowed base, 4-winged and 

 -keeled along the sutures, 25-65 mm. long, 12-25 mm. thick, dark-brown and 

 more or less thickly covered with yellow scales; husk thin, brittle, at maturity 

 splitting nearly to the base and often persistent on the branch during the winter 

 after dropping the nut; nut usually thin-shelled, pointed at both ends, somewhat 

 bright-reddish-brown, the reddish-brown kernel sweet. Carya Pecan (Marsh.) 

 Engl. & Graebn., Hicoria Pecan (Marsh.) Britt. 



In low rich grounds along streams, bottomlands and moist open woodlands, 

 mostly in Okla. and cen. and n.w. Tex.; from Tex., n. to Ind. and la., e. to Ala. 



774 



