Didonica subsessilis Luteyn, Syst. Bot. 16: 594, fig. 5.  1991.  Type.  Panama.  Veraguas: Top of Cerro Arizona, above Santa Fé, 1400 m, 22 Apr 1980 (fl), Hammell & Kress 8546 (holotype: DUKE, photo NY neg. 12661).  Images:  Habit. Flower.  Line-drawing.

         Epiphytic shrub, vegetatively glabrous.  Mature stem terete to subterete, striate;  bark reddish-brown when dry;  twigs subterete, complanate to bluntly angled, striate, reddish-brown when dry;  bud scales 2, broadly ovate, mucronate, ca. 3 mm long.  Leaves thick coriaceous, imbricate, subsessile, flat to apparently involute (especially when young), clasping the stem, ovate to ovate-elliptic, 3.2-6 x 2-3.5 cm;  base rounded and deeply cordate;  apex shortly and bluntly acuminate; margin weakly and remotely crenate, slightly revolute;  7-9-plinerved from near or just above the base, midrib and lateral veins plane to slightly raised on both surfaces, reticulate veinlets raised on both surfaces but inconspicuous beneath;  petiole subterete, broadly canaliculate above, 2-5 x 2-2.2 mm.  Inflorescence with flowers solitary and somewhat concealed by the involute leaves, surrounded at the base by the 2 persistent bud scales plus several tiny, ovate, obtuse bracts less than 1 mm long;  floral bract ovate, acute, ca. 2 mm long, the margin glandular-fimbriate;  pedicel subterete, broadening distally, 1.5-2 x 1.5 mm, bearing numerous glandular fimbriae at articulation with calyx;  bracteoles located near base, striate, nearly concealing calyx, elliptic to ± oblanceolate, apically rounded, 7-8 mm long.  Flowers 5-merous;  hypanthium cylindric-campanulate, apparently bluntly angled opposite the sinuses, 3-3.5 x 2.5-3 mm;  calyx glabrous, 6-7 mm long, the limb campanulate, ± striate, ca. 5 mm long including the lobes, ca. 7 mm in diam. at the distal tip;  lobes triangular, acute, conspicuous, 2-2.5 x ca. 2.8 mm; sinuses obtuse to narrowly rounded;  corolla succulent, bistratose, coriaceous when dry, ca. 7 mm long but still in bud, glabrous without but moderately short-pilose on lobes within, "buds green";  stamens 10, immature;  filaments glabrous, ca. 1.2 mm broad at base but immature;  anthers ca. 6 mm long;  thecae ca. 5 mm long;  tubules ca. 1 mm long;  style glabrous.  Berry not seen.

         Distribution (Map).  Known only from the type location and three collections.  Rare and endangered.