Machaonia pringlei A. Gray

Machaonia pringlei A. Gray, Proc. Am. Acad. 21: 380. 1886 A shrub 1-2 meters high, unarmed, the branches reddish-brown, very sparsely lenticellate, the branchlets glabrous, the internodes short or elongate; stipules 3 mm. long, deltoid-acuminate, glandular-dentate; leaves opposite, short-petiolate, the petioles marginate to the base, the blades linear-lanceolate, 3-6 cm. long, 4-8 mm. wide, long-attenuate to each end, chartaceous, glabrous, the costa stout and very prominent beneath, the lateral nerves mostly obsolete, the margin often obscurely crispate; inflorescence many-flow r ered, 3-6.5 cm. broad, the branches sparsely puberulent, the flowers partly sessile and partly pedicellate, the bracts linear, often elongate and foliaceous; hypanthium turbinate, densely covered with short white subappressed hairs, the 4 or 5 calyx-lobes broadly cuneate, usually truncate at the apex, green, glabrous, nearly as long as the hypanthium; corolla 4 mm. long, glabrous outside, the lobes oval-obovate, longer than the tube, the margins undulate; anthers exserted.
Type locality: Limestone ledges of the mountains near Jimulco, Coahuila. Distribution: Known only from the type locality.

Machaonia pringlei là một loài thực vật có hoa trong họ Thiến thảo. Loài này được A.Gray mô tả khoa học đầu tiên năm 1886.