Monographs Details: Tetragonanthus whitei Rusby
Authority: Rusby, Henry H. 1927. Descriptions of New Genera and Species of Plants Collected on the Mulford Biological Exploration of the Amazon Valley 1921-1922. Mem. New York Bot. Gard. 7: 205-387.
Description:Distribution and Ecology - (Fruiting specimens). Glabrous. Stems tufted, 5 to 10 cm. tall, erect, rather stout, branching only at the summit, sometimes reddish below, more or less winged above, the wings green. Koot-leaves to 2 or 3 cm. long, including the long petiole, widelyspreading, prostrate or ascending, the blade 4 to 10 mm. or more long, the base tapering into the petiole, thickish, entire, obtuse. Stem-leaves few or none, sessile, lanceolate, to 1.5 or 2 cm. long, yellowish-green, with a stout green midrib. Flowers solitary at the ends of the stout branchlets, all parts persistent. Calyxlobes.") mm. long, nearly 2 mm. wide, oblanceolate or spatulate with rounded summit, erect. Corolla-tubes 5 mm. long, erect, lanceolate, acutish, the spur of equal length, completely reflexed. Stamens nearly 2 mm. long, erect, filament and anther about equal, or the filament longer, the filament slender, somewhat flattened, the anther oval, extrorse, attached at about the middle. Pod nearly 1 cm. long, 4 mm. broad, ovoid, acute, 2-valved.

Distribution and Ecology - Pongo de Quime, 11,500 feet, 0. E. White, July 11, 1921 (no. 178). "Herb 4 to 6 inches high, in sandy loam, by water edge, in boggy ground. Flowers greenish to yellowish. Rare."