Ceratostema macbrydiorum Luteyn, Fl. Ecuador 54: 242.  1996.  Type.  Ecuador.  Morona-Santiago:  NW range of Cordillera del Cóndor, W side overlooking Río Zamora, 2000 m, 5 Jan 1972  (late fl), MacBryde & Andreetta 1022 (holotype, MO).

        Trailing, epiphytic shrub, reportedly with lignotubers;  stem terete, striate, the bark cracking longitudinally;  twigs terete, striate and ribbed, densely white, short-hirsute.  Leaves coriaceous, broadly ovate to hemispherical, 6-8.5 x 4.8-6.5 cm, base rounded, deeply cordate with the lobes broadly imbricate, apex abruptly and sharply short-acuminate, margin entire, densely pilose above when young then glabrate, densely pilose with white, appressed hairs to somewhat floccose-tomentose beneath;  5-7(-9)-plinerved from near the base, midrib plane to slightly raised above and raised beneath, lateral nerves and reticulate veinlets slightly raised but inconspicuous on both surfaces;  petiole obscure, terete, rugose, 1-2 mm long and in diam., densely hirsute with white hairs.  Inflorescence axillary, solitary, racemose, 1-flowered, surrounded at the base by a series of triangular, acute, pilose bractlets to 2 mm long;  rachis terete, striate, ca. 5 mm long, short-pilose;  floral bract triangular, acute, 2.2 x 1.2 mm, short-pilose, eglandular;  pedicel terete, striate, ca. 9 mm long, short-pilose;  bracteoles basal, similar to floral bract but ca. 1.5 mm long.  Flowers with calyx articulate, 5-lobed, ca. 28 mm long, appressed pilose all over but more dense on hypanthium;  hypanthium cylindric, bluntly 5-winged, ca. 6 mm long and ca. 9 mm diam.;  limb cylindric-spreading, ca. 22 mm long;  lobes ovate to elliptic-ovate, sharply acuminate, ca. 21 x 7-8 mm, margins eglandular;  sinuses acute;  corolla and stamens not seen.  Berry not seen.

        Distribution.  Endemic to Ecuador (Morona-Santiago), and known only from two collections, at 1000 m.