(Schlecht.) Dec. in DC., Prodr. 8:603.1844
Slender vine with copious milky sap, glabrous except on corolla and sometimes upper midrib of leaf; stems with nodes somewhat enlarged, with prominent interpetiolar ridge bearing several (usually 3 or 4) glands. Leaves opposite; petioles 1-1.5 cm long; blades ± oblong to elliptic, acuminate and downturned at apex, rounded or obtuse at base, 3-7.5 cm long, 1-2.5 (3) cm wide, bicolorous. Cymes axillary, pedunculate, umbellate, shorter than leaves; peduncles usually shorter than pedicels; pedicels 1-2.5 cm long, slender; flowers 1-1.4 cm wide, 5-parted; calyx lobes oblong-ovate, ca 1.5 mm long, obtuse, glabrous, pale-margined; corolla greenish-white, spreading, deeply lobed, the lobes lanceolate-oblong to triangular, 5-6 mm long, obtuse, densely short-villous inside especially along margin, glabrous outside; gynostegium ca 3 mm long, the corona with 5 semivesicular sacs affixed to staminal tube; anthers terminating in an inflexed membrane; pollinia pendulous, ovoid. Follicles glabrous, fusiform, 7-9 cm long, ca 2 cm wide at widest part, rounded at base, broadest below middle, gradually tapered to narrow, blunt tip; seeds ca 5 mm long, narrowly spatulate, one side prominently papillate, the apical tuft of trichomes ca 4 cm long. Croat 6375,13159.
Seen in Rear # 8 Lighthouse Clearing. Flowers from August to October. The fruits mature in the early dry season (December to March).
Very similar to Sarcostemma clausum, but almost totally glabrous, with interpetiolar ridges and glands, and with fruits rounded at the base and tapered at the apex.
Mexico to South America. In Panama, known from tropical moist forest in the Canal Zone, Veraguas, Panama, and Darién, from premontane moist forest in the Canal Zone and Panama, and from premontane wet forest in Colón, Coclé, and Panama.
See Figs. 466 and 467.