Diogenesia gracilipes (A. C. Smith) Sleumer, Notes Roy. Bot. Gard. Edinburgh 36(2): 255.  1978.  Eleutherostemon gracilipes A. C. Smith, Mem. New York Bot. Gard. 8(1): 49.  1952.  Type.  Ecuador.  Morona-Santiago:  Valley of Río Negro, junction of the Pailas and Negro rivers, on trail to Méndez, 1830-2290 m, 20-24 Aug 1945 (fl), Camp E-4924 (holotype, US;  isotype, NY, photo NY neg. 9897).

        Shrub to 3 m tall;  stem terete to subterete, obtusely angled, grooved, glabrous;  twigs subterete, complanate, bluntly angled to grooved, glabrous.  Leaves subcoriaceous to chartaceous when dry, lanceolate or ovate-lanceolate, 7-11 x 1.5-5 cm, base broadly obtuse or rounded, apex narrowed and long-acuminate to an obtuse acumen ca. 2 cm long, margin slightly recurved, glabrous but with glandular fimbriae scattered beneath;  5-plinerved from near the base with the inner pair of lateral nerves arising ca. 2 cm above the base, midrib slightly thickened and raised in the proximal 1 cm then impressed distally above, conspicuously raised beneath, lateral nerves impressed above and raised beneath, reticulate veinlets slightly raised to impressed above but obscure, raised beneath;  petiole subterete, rugulose, 1-3 mm long, glabrous.  Inflorescence axillary, with seemingly solitary flowers with several, obscure basal bracts;  floral bract not seen;  pedicel subterete, 20-30 mm long, minutely white puberulent especially near base;  bracteoles nearly basal, minute, ca. 1 x 0.3 mm, weakly puberulent, margin glandular-fimbriate.  Flower with calyx 4.5-5 mm long, weakly white puberulent;  hypanthium campanulate, terete, 2.5-3 mm long, obscurely reddish glandular at base;  limb erect-spreading, ca. 2 mm long;  lobes apiculate, ca. 0.5 mm long;  sinuses flat;  corolla thin carnose, cylindric-campanulate, 18-22 mm long and 7-8 mm diam. at center, the lobes reflexed, deltate, obtuse, 1.5-4 mm long;  stamen 10, equalling the corolla;  filaments distinct, ca. 13 mm long, villous with hairs ca. 0.3 mm long;  anthers 7-7.5 mm long;  thecae smooth, ca. 2.5 mm long;  tubules 5-5.5 mm long, dehiscing through oval clefts 1-1.5 mm long;  style equalling corolla;  nectariferous disc annular-pulvinate, fleshy, glabrous.  Berry not seen.

        Distribution.  Endemic to Ecuador and known only from the type collection;  forest at 1830-2290 m altitude.  Rare and endangered.