Bouvardia xestosperma (B. L. Rob. & Greenm.) Terrell & S. D. Koch

Oldenlandia xestosperma Rob. & Greenm. Proc. Am. Acad. 32:
41. 1896.
Erect perennial, 2-6 dm. high, slightly puberulent on the stems but elsewhere glabrous, the stems few, from a suffrutescent base, sparsely branched above, the branches slender, terete, the internodes shorter than the leaves; stipules 1-2 mm. long, triangular, cuspidate or laciniatelobate, the lobes gland-tipped; leaves sessile, erect or ascending, linear, 1.5-4.5 cm. long, 1-2.5 mm. wide, attenuate at each end; flowers cymose, the cymes terminal, long-pedunculate, few-flowered, the pedicels slender, 2-7 mm. long; hypanthium about 1 mm. long, the calyxlobes longer, lance-subulate, attenuate; corolla funnelform, about 8 mm. long, purplish, the tube narrowly obconic, several times as long as the calyx-lobes, the lobes oblong-ovate or ovatetriangular, obtuse, about one third as long as the tube; capsule obovoid, 4 mm. long; seeds minute, subangulate, yellowish-brown, lustrous.
Type locality: Open glades, Sierra de San Felipe, Oaxaca, at an altitude of 2400 meters. Distribution: Oaxaca.