Halenia rhyacophila C.K.Allen

Herb, perennial, to 18 cm tall (Panama); the stems single or several-branched at the base, terete, inconspicuously winged, the internodes very short. Leaves basal and cauline, the basal leaves often in a dense rosette, narrowly deltoid, apically acute to short-apiculate, basally long-attenuate, sessile to subsessile, 3.5-5.2 cm long and 0.3-0.5 cm broad, trinervate, ? undulate, the cauline leaves linear-ovate, acute at the apex, long-attenuate into a short petiole, 1-3.5 cm long and 2-3 mm broad, trinervate. Inflorescences terminal or axillary, appearing cy-mose or racemose, ? compact, several-to many-flowered, the flowers often ap-pearing congested; the pedicel 1-2.5 cm long, strongly ascending. Flowers white; calyx lobes narrowly ovate to narrowly oblong-ovate, acute at the apex, 5-7 mm long and 1-1.5 mm broad, trinervate, ? papillate; corolla lobes ovate to elliptic, obtuse, acute to short acuminate at the apex, the margin minutely erose, 5-10 mm long and 3.5-5 mm broad, ? papillate, the spurs 2.5-4 mm long, descending to strongly descending, 0.3-0.7 mm in diameter; stamens 4-4.7 mm long, the filaments 2.5-3 mm long, linear, flattened, the anthers 1.5-1.7 mm long, the thecae free and slightly spreading at the base; pistil ca. 5.2 mm long, the ovary ellipsoid, ca. 3 mm long, evanescing into the style, the stigmatic lobes ca. 0.5 mm long, truncate at the apex. Capsules ellipsoid, 10-12 mm long, ? lustrous,