(Vahl) Steud., Bot. Nom. Phan. 431.1821
I. gracilipes Standl.
Tree, to 10 m tall; young branches and inflorescences puberulent, otherwise glabrous. Petioles unwinged or winged near apex; rachis winged; leaflets in 2 or 3 pairs, elliptic to oblong-elliptic, acuminate, obtuse to rounded at base, the terminal pair 11-17 cm long, 4-6.5 cm wide. Racemes umbelliform, axillary and solitary (appearing paniculate on new growth); peduncles 2-4 (5) cm long; rachis very short, 3-4 mm long; bracts subulate, ca 4 mm long; flowers long-pedicellate; pedicels slender, 8-12 (15) mm long; calyx 3-5 mm long, the lobes acute, ca 0.5 mm long; corolla 9-14 (17) mm long, the lobes acute, to ca
2 mm long; stamens and style to ca 20 mm long. Legumes flat, 6-18 cm long, l.5-3.5 cm wide, straight or curved, glabrate in age, the marginal ribs prominent. Croat 7877, 11889.
Common, at least on the shore. Flowers from August to May, possibly twice a year. Fruit maturity period uncertain; mature fruits have been seen in the early rainy season.
Inga quaternata, the only other species in the genus with long-pedicellate flowers, is distinguished by its unwinged rachis.
Panama to Peru and Brazil. In Panama, known from tropical moist forest in the Canal Zone and Darien and from premontane wet forest in Colon and Panama. See Fig. 266.