Duroia costaricensis Standl.

Duroia costaricensis Standley, Contr. U. S. Nat Herb. 20: 208. 1919.
Branchlets stout, hirsute, densely leafy at the ends; leaves opposite, the petioles stout,
7 mm. long or shorter, densely hirsute, the blades oblong-obovate, 10-17.5 cm. long, 3.5-6.5 cm.
wide, cuneately narrowed to the base, obtuse at the apex and abruptly cuspidate-acuminate,
with a narrow falcate acumen, chartaceous, copiously hirsute with slender fulvous hairs,
the venation prominent beneath, the lateral veins slender, 7 or 8 on each side, the margin
plane; staminate flowers fasciculate-cymose at the ends of the branchlets, short-pedicellate;
calyx and hypanthium very densely hirsute with pale brownish hairs; hypanthium 1.5 mm.
long, the calyx 4—4.5 mm. long, densely whitish-sericeous within, the lobes 6 or 7, distant,
linear-subulate, as long as the limb; corolla (in bud) 14 mm. long, densely sericeous outside,
the tube stout, glabrous or nearly so within, the 6 lobes lance-oblong, acutish, longer than the
tube, finely sericeous within; anthers sessile, 4 mm. long.
Type locality: Marais de Sierpe, Costa Rica. Distribution: Known only from the type locality.