Guettarda spinifera Urb.

Guettarda spinifera Urban, Repert. Sp. Nov. 18: 197. 1922
A densely branched shrub 1 meter high, the branches terete, grayish or blackish, the young branchlets minutely pilosulous; stipules lanceolate, acuminate, small, soon deciduous; petioles stout, 2-4 mm. long; leaf-blades obovate, 1.5-2.5 cm. long, 0.7-1.5 cm. wide, rounded or acute at the apex and produced into a stiff spine 2-3 mm. long, gradually narrowed to the acute base. rigid-coriaceous, the costa and lateral nerves prominent on both surfaces, the lateral nerves 6 or 7 on each side, the veins pale and closely reticulate, glabrate on the upper surface, minutely pilose beneath, the margins conspicuously, coarsely, and irregularly crenate; peduncles axillary, 2-7 mm. long, bearing 1-3 sessile flowers, the bracts lanceolate; calyx cylindraceous, 1.3 mm. long, obscurely denticulate; corolla greenish-purple, 11-12 mm. long, the tube slightly ampliate above, minutely, densely, and retrorsely appressed-pilose, glabrous within, the 4 or 5 lobes ovate or oval, less than half as long as the tube; anthers linear, 2.5 mm. long; style glabrous, 3.5 mm. long; ovary 3or 4-celled; fruit black, obovoid, 3-4 mm. long, 2-2.5 mm. thick.
Type localitv': Petite Gonave Island, Haiti, on coral rock. Distribution: In calcareous soil, Haiti.

Guettarda spinifera là một loài thực vật có hoa trong họ Thiến thảo. Loài này được Urb. mô tả khoa học đầu tiên năm 1922.