Willd. subsp. spuria (Willd.) J. León, Ann. Missouri Bot. Gard. 53:339.1966
Tree, to 12 (20) m tall, ca 30 cm dbh; branchlets sometimes ribbed below petioles, tomentose when young, glabrate in age, lenticellate. Petiole and rachis tomentose; petioles winged or not, 8-40 mm long; rachis winged; leaflets in 4-8 pairs (rarely 9 or 10), oblong-elliptic to lanceolate, acuminate, obtuse to rounded at base, tomentose to sparsely pubescent, more densely on veins, the terminal pair 4.5-12 (17) cm long, 2.5-5.5 cm wide. Spikes axillary or terminal, in groups of 1 to many; peduncles 3-5 (7) cm long, tomentose; rachis 1-3 (5) cm long, tomentose; bracts ca 3 mm long; calyx densely villous, 11-19 mm long, sometimes striate or minutely ribbed, the lobes acute, ca 3 mm long; corolla lanate, 15-20 mm long, the lobes acute, ca 4 mm long; stamens and style to 80 mm long. Legumes terete, densely tomentose, usually less than 15 cm long (to 30 cm), to 2 cm wide, usually curved, the base blunt, the apex pointed, the margins prominently raised, the lateral margins rounded and narrowly ribbed, the intervening area of the valve minutely transversely ribbed. Zetek 3464.
Though several old collections were made by Zetek, the species has been collected only once in recent years, along the shore of Gigante Bay. Flowers throughout the dry season (January to June), rarely in the rainy season; an individual plant may flower twice a year. Synchronous bursts of flowering have been observed in April. The fruits may be of mature size by June, with seed dispersal in the rainy season.
Mexico to northern South America; Greater Antilles. In Panama, known from tropical moist forest in the Canal Zone, Bocas del Toro, Veraguas, Los Santos, Herrera, Coclé, Panama, and Darien, from tropical dry forest in Coclé, from premontane moist forest in Los Santos, and from premontane wet forest in Chiriquí (Boquete).