Macropharynx isthmica (Woodson) J. F. Morales, M. E. Endress & Liede

Peltastes isthmicus Woodson, Ann. Mo. Bot
Card. 23: 187. 1936.
Stout fruticose liana; leaves peltate, firmly membranaceous, broadly ovate, 10-30 cm, long, 8-20 cm. broad, very abruptly and shortly acuminate, broadly rounded at the base, sparsely and inconspicuously puberulent-papillate to glabrate above, densely ferruginouslanulose to glabrate beneath, the petioles 5-12 cm. long, densely ferruginoustomentulose to glabrate; inflorescence about equaling the leaves, bearing 10-15 handsome yellowish flowers; pedicels 18-20 mm. long, densely and minutely f erruginous-lanulose ; bracts foliaceous, oblongspathiform, 8-17 mm. long; calyx-lobes oblong-obovate, shortly subcaudate-acuminate, 2830 mm. long, inconspicuously ferruginous-puberulent at the base; corolla broadly infundibuliform, glabrous externally, the tube proper 23-25 mm. long, about 5 mm. in diameter at the base, the throat broadly campanulate, 20-23 mm. long, about 20 mm. in diameter at the orifice, the lobes obliquely obovate, 30-35 mm. long, spreading; anthers 12 mm. long, hirtellous dorsally; ovary glabrous, scarcely surpassing the nectaries; follicles stout, falcate, 22-25 cm. long, irregularly ferruginous-papillate.
Type locauty: Near San Felix, Chiriqui, Panama. Distribution: Costa Rica and Panama.