Trees , to 52 m. Bark gray or brownish, smooth or ridged or exfoliating with small platelike scales. Twigs tan, slender, glabrous except scaly near tip. Terminal buds sulfur yellow to tan, oblong, 10(-19) mm, densely scaly with yellow peltate scales, pilose near apex; bud scales valvate; axillary buds protected by pair of valvate bracteoles. Leaves 2-4 dm; petiole 3-7 cm, glabrous near base, hirsute near rachis. Leaflets (5-)7-9(-13), lateral petiolules 0-1 mm, terminal petiolules 2-8 mm; blades ovate-lanceolate, rarely falcate, 3-19 × 1-7 cm, margins finely to coarsely serrate, without tufts of hairs, apex acuminate; surfaces abaxially villous with unicellular and 2-4-rayed fasciculate hairs along midrib and major veins, densely to sparsely pubescent throughout, and with abundant large peltate scales and small round and 2- or 4-lobed peltate scales in spring, still present near margins at base and apex in fall, adaxially villous along midrib near base, sparsely scaly in spring. Staminate catkins pedunculate, to 16 cm, stalks without hairs or hirsute, bracts scaly; anthers hirsute. Fruits brown, cylindric, obovoid, or nearly spheric, not compressed or only slightly compressed, 2-3 × 2-3.2 cm; husks rough, 2-3 mm thick, dehiscing to middle or slightly below, sutures winged; nuts light brown, ellipsoid to ovoid, not compressed or only slightly compressed, not angled, rugulose; shells thin. Seeds bitter. 2 n = 32. Flowering spring. River flood plains, well-drained hillsides, and limestone glades; 0-900 m; Ont., Que.; Ala., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.H., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Vt., Va., W.Va., Wis. Carya cordiformis hybridizes with C . illinoinensis ( C . × brownii Sargent), C . ovata ( C . × laneyi Sargent), and C . laciniosa , and reputedly with the tetraploid C . glabra ( C . × demareei Palmer). The Fox Indians used Carya cordiformis medicinally as a diuretic, a laxative, and a panacea (D. E. Moerman 1986).
Tree 15 - 26 m tall, trunk 30 cm - 0.9 m in diameter Leaves: alternate, odd-pinnately compound, 15 - 40 cm long, with seven to nine leaflets. Flowers: either male or female, found on the same tree (monoecious). Male flowers are borne in clusters of three hanging catkins 8 - 16 cm long. Female flowers form in spikes of two to five about 1.3 cm long. Fruit: a nut surrounded by a husk, 2 - 3 cm long, 2 - 3.2 cm wide. The husk is thin, nearly spherical, covered with short yellow hairs, splitting to the center. The tiny nut is light brown and smooth. Bark: gray to brown, smooth, slowly developing shallow furrows. Twigs: changing from green to brown to gray, sparsely hairy when young. Terminal buds: sulfur-yellow, 1 - 2 cm long, appearing naked but with scales that do not overlap (valvate). Leaflets: bright green above, paler beneath, 7 - 15 cm long, 2 - 6.5 cm wide, lance-shaped, toothed, hairy-veined beneath. Leaves turn golden in fall. Foliage is aromatic when crushed. Lateral buds: smaller and four-angled.
Similar species: Carya glabra can be distinguished from other hickories by its bark that remains tight except for a few shaggy strips, fairly smooth twigs, five to seven leaflets, pear-shaped to elliptical or spherical fruit with a husk that may split to the base, and small dome-shaped terminal buds.Carya laciniosa has shaggy bark, stout orangish tan twigs with orange lenticels, seven leaflets with soft hairs beneath, very large oblong to spherical and four- to six-ridged nuts with husks splitting to the base, and large terminal buds with slightly curling outer scales. Carya ovata differs by its shaggy bark, foliage that smells like apples when crushed, five leaflets fringed with tufts of hair along the margins, nearly spherical husks that separate from a four-ridged nut, and large terminal buds with slightly curling outer scales. Carya tomentosa has fissured bark, densely hairy and reddish brown twigs, seven to nine leaflets with hairs beneath, and husks that split to the middle or base to reveal four-ridged nuts.
Flowering: mid May to early June
Habitat and ecology: Common in mesic woods, along edges of streams, and on lower upland slopes.
Occurence in the Chicago region: native
Notes: Carya cordiformis wood is considered the best wood for making hickory smoked meats. The nuts are so bitter that most animals will not eat them.
Etymology: Carya comes from the Greek name for walnut. Cordiformis comes from the Latin words meaning heart-shaped.
Bark scaly; winter-buds bright orange- yellow; lfls mostly (5)7-9(11), the lateral lanceolate to lance-ovate or elliptic, the terminal commonly long-cuneate at base and sessile or nearly so; staminate catkins clustered just beneath the new growth on the wood of the previous year's twigs; fr obovoid to subglobose, often somewhat flattened, 2.5-3.5 cm, winged chiefly above the middle, splitting to about the middle; nut subglobose to obovoid, 1.5-3 cm, at least two-thirds as thick; obscurely angled, otherwise smooth, tipped with a slender, persistent point; kernel bitter; cotyledons bifid; 2n=32. Woods; s. Me. and sw. Que. to Minn. and e. Neb., s. to Fla. and Tex. C. جaneyi Sarg. is a hybrid with C. ovata.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.