Arachnothryx aspera (Standl.) Borhidi

Rondeletia aspera Standley, sp. nov
Branches stout, brown, pilose when young with short ascending hairs; stipules linear to oblong-lanceolate, 6-9 mm. long, erect, subpersistent, thin, brown, strigose outside; leaves opposite, the petioles stout, 5-10 mm. long, densely short-pilose, the blades oblong-elliptic to lance-oblong, 6-10 cm. long, 2-4.2 cm. wide, acute or acuminate at the base, acute or acutely short-acuminate at the apex, membranaceous, green above, very scabrous with short slender hairs, beneath densely white-tomentose when young, the tomentum deciduous in age, the lower surface then short-pilose, the venation prominent, the lateral veins 8 or 9 on each side, subarcuate, ascending at an acute angle; inflorescence terminal, cymose-paniculate, many-flowered, very dense, hemispheric, 3-4 cm. broad, pedunculate, the flowers sessile or nearly so; bracts and bractlets small; hypanthium densely pilose with short whitish appressed hairs; calyxlobes 4, oval to ovate-deltoid, obtuse or rounded, 1-2 mm. long, erect; corolla arachnoidtomentose outside the tube stout, 8-9 mm. long, the throat naked, the 4 lobes rounded, about 3 mm. long; anthers included.
Type collected at Pont du Rodeo, below Pacaca, Costa Rica. January, 1891, //. Pittier 3243 (U. S. Nat. Herb. no. 94140S).