Osage Orange

In Pakistan, it is reported to be cultivated in gardens at Quetta, Peshawar, Wah and Lehtrar (near Rawalpindi), Abbotabad, Lahore etc. by R.R. Stewart (l.c. 194), but no specimens have been seen by the author.

Maclura pomifera is native to southwestern Arkansas, southeastern Oklahoma, and Texas; it is introduced and naturalized elsewhere in the United States. Collections in California, Connecticut, Massachusetts, Rhode Island, and Washington appear to represent isolated escapes.

Maclura pomifera has been widely used in fencerows on farms and along roadways in the midwest and eastern states as windbreaks and wildlife shelter.

The Comanches used Maclura pomifera as an eye medication (D. E. Moerman 1986).

Tree, or rarely a large shrub, upto 15 (-20) m tall. Trunk 2.5-3 m in circumference with longitudinally deep fissured dark orange-brown bark. Young shoots olive green, pubescent to glabrous with 10-25 nun long axillary spines, rarely spineless. leaves with (1.5-) 2.5 an long petiole; lamina ovate to lanceolate-oblong, 5-12 (-16) cm long, (2-) 3-8 (-10) cm broad, entire, 5-costate from the cuneate to ± cordate base, shining above, finely pubescent to eventually glabrescent, apex acute-acuminate or rarely obtuse; stipules subulate, c. 2.5-3.5 mm long, acuminate, brownish-membranous, caducous. Male inflorescence a subglobose, 2.5-3.5 cm long, pseudoracemose clusters on slender, 1-2 cm long peduncles. Male flowers: pedicels 2-5 mm long, filiform; sepals basally connate, oval-oblong, c. 1.5 mm long, lanate hairy outside; staminal filaments longer than sepals with oval, exserted anthers. Female inflorescence a dense, axillary, subsessile to short peduncled globose head, c. 2 cm in diameter. Female flowers: subsessile; sepals united at the base, oblong c. 4 mm long, thick, lanate hairy at the apex; ovary with filiform, c. 20-25 mm long, hairy styles. Fruit large, sub-globose, 10-15 cm in diameter, orange-like but wrinkled and rough, yellowish-green. Seeds c. 1 cm long.

Trees , to 20 m. Bark dark orange-brown, shallowly furrowed, ridges flat, often peeling into long, thin strips. Branchlets greenish yellow, becoming orange-brown; thorns stout, straight, to 1.5 cm, usually lateral to spur branch, spur branches often paired. Buds often paired, larger one red-brown, globose, 1.5-2 mm; scales ciliate; leaf scars half round, bundle scars arranged in oval. Leaves: stipules lanceolate, 1.5-2 mm, pubescent and long-ciliate; petiole 1-2.5 cm, pubescent. Leaf blade 4-12 × 2-6 cm, base rounded, apex acuminate; surfaces abaxially pale, glabrate, midrib and veins pubescent, adaxially lustrous, glabrous, midrib somewhat pubescent. Staminate inflorescences clustered on lateral spur branches; peduncle 1-1.5 cm, pubescent; heads globose or cylindric, 1.3-2.3 cm; pedicels 2-10 mm, glabrate. Pistillate inflorescences: peduncle 2-2.5 mm, glabrous or pubescent; heads globose, sessile on obconic receptacle, to 1.5 cm diam. Staminate flowers: sepals distinct, yellow-green, ca. 1 mm, apex acute, pubescent; filaments ca. 2 mm, closely appressed to sepals, flattened. Pistillate flowers: sepals green, obovate, 3 mm, enclosing and closely appressed to ovary, hoodlike, ciliate near tip; ovary ovoid, compressed, ca. 1 mm; style base green, ca. 3 mm, branches 4-6 mm, glabrous; stigma yellowish, papillose. Syncarps yellow-green to green, spheric, surface irregular, exuding milky sap when broken, peduncle short, glabrous or pubescent; achenes completely covered by accescent, thickened calyx lobes and deeply embedded in receptacle. Seeds cream colored, oval to oblong, 8-12 × 5-6 mm, base truncate or rounded with 1-3 minute points, margins with narrow groove, apex rounded, mucronate; surfaces minutely striated or pitted.

Distribution: A native of N. America, introduced and cultivated in many parts of the world.

Ala., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Md., Mass., Mich., Miss., Mo., Nebr., N.J., N.Mex., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., S.Dak., Tenn., Tex., Va., W.Va., Wis.

Fl. Per.: May-July.

Flowering spring.

Thickets; 0-1500m.

Ioxylon pomiferum Rafinesque, Amer. Monthly Mag. & Crit. Rev. 2: 118. 1817; I. aurantiacum (Nuttall) Rafinesque; Maclura aurantiaca Nuttall