Arachnothryx stachyoidea (Donn. Sm.) Borhidi

Rondeletia stachyoidea Donn. Smith, Bot. Gaz. 43: 298. 1906
Shrub or small tree, 4.5 meters high or less, the branches slender, terete, grayish-brown, pilose-strigose when young, glabrate in age; stipules triangular-lanceolate, 6-10 mm. long, attenuate, appressed, persistent, brown, glabrate; leaves opposite, the petioles stout, 3-18 mm. long, the blades ovate-lanceolate to narrowly elliptic-lanceolate, 6-17.5 cm. long, 1.2-3.8 cm. wide, attenuate or abruptly acuminate at the base, long-attenuate at the apex, thin, brightgreen and lustrous on the upper surface, glabrous, or strigose along the veins, densely sericeous beneath with long lustrous fulvous hairs, glabrate in age, the costa slender, prominent, the lateral veins slender, about 8 on each side, arcuate, ascending at an acute angle; inflorescence terminal, shortpedunculate, the flowers sessile or subsessile in few-flowered cymes, these spicate, the spikes 7-12 cm. long; bracts linear-subulate; hypanthium sericeous-strigose ; calyxlobes 4, lance-oblong, 3-4 mm. long, attenuate, spreading; corolla white, the tube slender, 7-8 mm. long, glabrous except at the top, there densely setose-pilose, naked in the throat, the 4 lobes rounded, 1.5 mm. long, spreading; anthers and style included; capsule subglobose, 2.5 mm. long, costate, glabrate.
Type locality: Semicoch, Alta Verapaz, Guatemala, at an altitude of 600 to 900 meters. Distribution: Guatemala to Costa Rica.