Erithalis quadrangularis Krug & Urb.

Erithalis quadrangularis Krug & Urban (; Urban, Ber. Deuts. Bot
Ges. 15: 270, hyponym. My 1897), Notizbl. Bot. Gart. Berlin
1: 320. S 1897.
A tree about 7 meters high, glabrous except the inflorescence, the branchlets very stout, quadrangular, the internodes elongate; stipule-sheath about 5 mm. long, truncate; petioles ver>' stout, 0.6-2 cm. long; leaf-blades mostly oval, sometimes ovate-elliptic, 8-12.5 cm. long, 3.5-8 cm. wide, rounded or very obtuse at the apex, rounded at the base and abruptly short-decurrent, • subcoriaceous, green above, the costa prominent, sulcate, the lateral nerves prominulous or plane, paler and brownish beneath, the costa stout, prominent, the lateral nerves verslender, scarcely prominulous, the margin revolute; inflorescence cymose-corymbose, many-flowered, about 6 cm. broad, the branches puberulent or glabrate, the j^edicels stout, 5-12 mm. long, the bracts mostly about 1 mm. long; calyx and hypanthium about 4 mm. long, puberulent or glabrate, the calyx shallowly 5or 6-dentate, the teeth rounded or obtuse; corolla 10-13 mm. long, puberulent or glabrate outside, the tube 1-2 mm. long, the lobes usually 6, linear, obtuse, recurved in anthesis; anthers linear, 5 mm. long; ovary 2-celled, each cell 81 0-loculate ; fruit subglobose, 8-10 mm. in diameter.
Type locality: New Green, Jamaica, altitude 700 meters. Distribution: Mountains of Jamaica.

Erithalis quadrangularis is a species of plant in the family Rubiaceae. It is endemic to Jamaica.