Thibaudia pachyantha A. C. Smith, Contr. U.S. Natl. Herb. 28(2): 415.  1932.  Type.  Colombia.  Nariño:  Road from Tuquerres, 900 m, 1851-1857, Triana 2689 (holotype, K;  isotypes, BM, P).  Images:  Habit.  Flowers.

        Terrestrial or epiphytic shrub with branches to 2.5 m long;  stem and twigs terete to subterete, bluntly angled, striate, violet or reddish, nitid, glabrous.  Leaves coriaceous, ovate, (6.5-)12-20 x (4-)6.5-9.5, base rounded to rarely subcordate, apex acute to short-acuminate, margin entire, glabrous but densely glandular-fimbriate with dark hairs to 0.2 mm long especially beneath;  pinnately nerved with 4-6(-9) pairs of lateral nerves per side, midrib (sometimes conspicuously thickened and raised in the proximal 1-2 cm) and lateral nerves conspicuously impressed above and raised beneath, reticulate veinlets conspicuously raised on both surfaces;  petiole terete, rugose, very stout, 2.5-3 mm long, glabrous.  Inflorescence axillary, racemose, 4-13-flowered;  rachis terete to bluntly angled, congested distally with proximal 2-3 nodes not developing, striate, thick, 1-4 cm long and to 4 mm diam., glabrous;  floral bract ovate to oblong, acute to rounded, 2-3 x 2-3 mm, glabrous;  pedicel subterete, hypercrateriform (very suddenly expanded at apex and broader in diam. than hypanthium), striate, 35-37 mm long, elongating to 55 mm post anthesis, glabrous;  bracteoles basal, similar to floral bract in size, sometimes the margin with minute glandular fimbriae.  Flowers with calyx articulate, 12-14 mm long, white, glabrous;  hypanthium cylindric but broadest at middle, 4-6 mm long, the base rounded;  limb cylindric but gradually spreading distally, 7-9 mm long;  lobes broadly ovate, apiculate, ca. 1-1.5 mm long;  sinuses acute or flat;  corolla thick-carnose, hard, cylindric, ca. 27 mm long and 9 mm diam., white to pinkish, the lobes 2-3 mm long, pinkish;  stamens equal, ca. 24 mm long;  filaments distinct, ca. 4 mm long, short-pilose along margins in distal one-third;  anthers ca. 21 mm long;  thecae ca. 11-12 mm long;  tubules laterally connate but distinct only in distal ca. 4 mm, ca. 9-10 mm long, dehiscing by clefts ca. 9 mm long.  Berry not seen.

        Distribution.  Colombia and Ecuador;  tropical moist, wet, and rainforest, to premontane rainforest, at 500-1300 m altitude.  Rare.