Pentagonia donnell-smithii (Standl.) Standl.

Watsonamra donnell-smithii Standley, Contr. U. S Nat. Herb. 17: 442. 1914.
Branchlets succulent, thick, sparsely sericeous or glabrate; stipules ovate, about 5 cm. long and 2.5 cm. wide, acuminate or attenuate, finely sericeous outside, glabrous within; petioles naked, 9-11 cm. long, minutely sericeous; leaf -blades oval, about 45 cm. long and 28 cm. wide, entire, obtuse at the base, membranaceous, glabrous above, paler beneath, sericeous along the veins, the lateral veins prominent, 14 on each side, straight, dichotomous near the margin; cymes dense, the peduncles 1-1.3 cm. long, the pedicels thick, 4-6 mm. long, tuberculate; bracts caducous; hypanthium about 6 mm. long, sericeous; calyx 1.2-1.5 cm. long, 5-7 mm. broad, the lobes oval or oblong, 6-7 mm. long, rounded at the apex, striolate, glabrous within; corolla sericeous outside, densely so above, the tube 2.5 cm. long, 3.5 mm. thick, the lobes lance-oblong, 6-7 mm. long, acute; filaments villous near the base.
Type locality: Near La Emilia, Llanuras de Santa Clara, Costa Rica, altitude 250 meters.
Distribution: Known only from the type locality.