Ceratostema prietoi A. C. Smith, Mem. New York Bot. Gard. 8(1): 63.  1952.  Type.  Ecuador.  Cañar:  Near Corazón, between San Vicente and Rosario, 1065 m, 6-10 Sep 1944 (fl), Prieto CP-13 (holotype, US;  isotype, NY).  Image:  SEM of pollen.

        Epiphyte, totally glabrous except staminal filaments;  stem thin, terete.  Leaves subcoriaceous or papyraceous, elliptic-lanceolate, 10-17 x 3-6 cm, base narrowly rounded, apex gradually acuminate (1-2 cm long), margin entire and narrowly recurved;  5(-7)-plinerved from base or inner laterals arising 1-2 cm above, midrib and lateral nerves slightly impressed above, raised beneath, reticulate veinlets sumimpressed or prominent;  petiole subterete, rugulose, 3-5 mm long.  Inflorescence racemose, 3-12-flowered;  rachis subterete, 0.5-3 cm long, short pedunculate;  floral bract deltate, ca. 1 mm long, caducous or persistent;  pedicel terete, 13-20 mm long;  bracteoles basal, deltate-subulate, ca. 0.7 mm long, caducous.  Calyx 7-9 mm long and apical diam.;  hypanthium cupuliform, ca. 5 mm long, rugulose not angled;  limb suberect, papyraceous;  lobes apiculate 0.5-1 mm long, marginally eglandular;  sinuses flat;  corolla carnose, cylindric, apparently not basally ventricose, 45-53 mm long and 7-9 mm basal diam., pale pink to crimson with green to yellowish-green lobes, the lobes deltate-lanceolate, ca. 15 mm long and 3 mm at base;  stamen 10, equallig corolla;  filaments distinct, 7-9 mm long, puberulent;  anthers ca. 40 mm long;  thecae 9-11 mm long, basally obtuse;  tubules dehiscing through oblique pores ca. 0.5 mm long;  style filiform, slightly exserted;  nectariferous disc carnose, annular-pulvinate.  Berry not seen.

        Distribution.  Endemic to Ecuador, and known only from three collections;  forest at 1065-1829 m altitude. Rare and endangered.