6. Carya laciniosa (F. Michaux) G. Don in J. C. Loudon, Hort. Brit. 384. 1830.
Shellbark hickory, kingnut
Juglans laciniosa F. Michaux, Hist. Arbr. Forest. 1(2): 199, plate 8. 1811; Hicoria laciniosa (F. Michaux) Sargent
Trees , to 41 m. Bark light gray, fissured or exfoliating, separating freely into large, thick, broad plates that persist. Twigs orange-tan, stout, hirsute, scaly. Terminal buds tan, broadly ovoid with apices of outer scales prolonged, 12-20 mm, tomentose; bud scales imbricate; axillary buds protected by bracteoles fused into hood. Leaves 6-9 dm; petiole 6-13 cm, minutely hirsute, becoming glabrous at base. Leaflets (5-)7-9(-11), lateral petiolules 0-1 mm, terminal petiolules 2-14 mm; blades ovate to obovate or elliptic, not falcate, 9-20 × 3-10 cm, margins coarsely serrate, apex narrowly acuminate; surfaces abaxially hirsute with unicellular, 2-6-rayed fasciculate and occasionally multiradiate hairs, scaly with abundant large peltate scales and small round peltate scales, adaxially hirsute along midrib, puberulent throughout. Staminate catkins pedunculate, to 20 cm, stalks and bracts minutely hirsute, capitate-glandular; anthers hirsute. Fruits tan to brown, spheric to ellipsoid, not compressed or slightly so, 4.5-6 × 4-5 cm; husks minutely hirsute, 7-13 mm thick, dehiscing to base, sutures smooth; nuts tan, ellipsoid, compressed, 4-angled, rugulose; shells thick. Seeds sweet.
Flowering spring. Rich bottomlands, along creeks, and in open cedar glades; 20-300 m; Ont.; Ala., Ark., Del., Ga., Ill., Ind., Iowa, Kans., Ky., Md., Mich., Miss., Mo., N.Y., N.C., Ohio, Okla., Pa., Tenn., Tex., Va., W.Va.
The most southern locality of Carya laciniosa is an outlier from Hardin County, Texas. Carya laciniosa hybridizes with C . illinoinensis ( C . × nussbaumeri Sargent) and C . ovata ( C . × dunbarii Sargent), and possibly C . cordiformis .
Cherokee Indians used Carya laciniosa medicinally as an analgesic, a gastrointestinal aid, and a general disease remedy (D. E. Moerman 1986).