The Schomburgk specimen indicates “Guiana” on the US sheet, and “Rio Branco” on the Kew specimen. The Kew isotype shows a corolla 2.8-3 mm long with a tube 2-2.1 mm long, 0.3-0.4 mm broad at the base, 0.5 mm broad at the orifice, and densely papillate-puberulous externally in the upper half; the corolla lobes are 0.9 mm long by 0.5 mm broad, obtuse, oblong, and papillate without; the leaves are densely scabridulous on both sides, linear, and 1-2 mm wide; the stems are 12-23 cm tall, with subappressed or ascending dense puberulence; the hypanthium has a few short aculeate or papillate hairs around the uppermost part, elsewhere glabrous; the two larger calyx lobes are 1.2 mm long, the smaller ones 0.6 mm long.
Mounted on the Kew sheet with the Schomburgk 856 specimen are the collections of Traill 442 and Appun 2403. All three specimens show the elongate salverform corollas densely papillate-puberulent without on the tube and lobes and the corollas varying from 2-3 mm in length. All show linear leaves which are densely scabrid-hispidulous on both sides and only 1.2-2 mm wide.