I. roussoviana Pitt. Guavito, Cansa boca, Bribri Tree, to 15 m tall; branchlets densely ferruginous-tomentose to glabrous-lenticellate. Petiole and rachis +/- terete, tomentose; leaflets in 3 or 4 pairs, oblanceolate to oblong-obovate, acuminate to obtuse at apex, acute to obtuse at base, puberulent especially on veins, the terminal pair 7-19 cm long, 3-7.5 cm wide. Racemes axillary, solitary (2 to 3 elsewhere); peduncle and floral rachis densely ferruginous-tomentose; peduncles 0.5-2.5 (3.5) cm long; rachis very short, to 5 mm long, giving the inflorescence a capituliform appearance; bracts ca 1 mm long; pedicel and calyx villous; pedicel 3-8 mm long; calyx 3-6 mm long, the lobes to 1 mm long; corolla sericeous, 6-11 mm long, the lobes to 1.5 mm long; stamens and style to 15 mm long. Legumes flat, 3-9 (18) cm long, 1.5-3 cm wide, 1-1.5 cm thick, curved, ferruginous-tomentose when young to glabrate in age, ribbed on margins. Croat 7699, Foster 1013. Common, at least on the shore. The flowers often appear on denuded branchlets or on branchlets with new leaves. Flowers possibly throughout the year, mostly in the late rainy and early dry seasons. Mature-size fruits have been seen from June to September.