Arachnothryx villosa (Hemsl.) Borhidi

Rondeletia villosa Hemsl. Diag. PI. Nov. 27. 1879
Shrub, the young branchlets more or less villous; stipules ovate-lanceolate, acute, 1-2 cm. long; leaves opposite, the petioles 4-15 mm. long, densely pilose, the blades oblong-elliptic or ovate, 10-25 cm. long, 4—9 cm. wide, acute at the base, acuminate or abruptly acuminate at the apex, green and sparsely pilose above, beneath long-pilose along the veins, arachnoid-tomentose between the veins with white hairs; inflorescence terminal and lateral, the flowers sessile or subsessile in dense few-flowered cymes, these arranged in narrow elongate spike-like panicles 15-24 cm. long; hypanthium densely tomentose; calyx-lobes 4, oblong, obtuse, unequal, longer than the hypanthium; corolla white, white-lanate outside, naked in the throat, the tube slender, 8-10 mm. long, the 4 lobes small, rounded, undulate; capsule subglobose, about 4 mm. in diameter, glabrate; seeds minute, angulate, punctulate.
Type locality: San Pedro No'.asco, Oaxaca. Distribution: Oaxaca, Chiapas, and Tabasco.

Arachnothryx villosa là một loài thực vật có hoa trong họ Thiến thảo. Loài này được (Hemsl.) Borhidi mô tả khoa học đầu tiên năm 1982.