Flora of Barro Colorado Island

Iresine angustifolia

Euphr., Beskr. St. Barth.165.1795

Erect or reclining suffruticose herb, l m tall; stems with several light ridges; young parts strigilose. Leaves oppo­site; petioles 0.5-1.5 cm long; blades lanceolate to linear­-lanceolate in lower part of plant, linear in upper flowering part, acuminate and mucronate at apex, acute to attenuate at base, 5-9 cm long, 1.5-3 cm wide. Inflorescences spicate, ovoid to linear, usually ca 1 cm long and 5 mm wide, pedunculate, alternate, subtended by linear leaves, in panicles merging with vegetative part of plant, the reproductive part to 50 cm long or more; flowers bisexual, subtended by transparent, mucronate bracts to 1 mm long; sepals 5, acute, 1-1.5 mm long, pilose and subtended by dense woolly pubescence; stamens 5; stigmas 2, not much longer than style. Utricles fragile, indehiscent, capped, falling with sepals; seed lens-shaped, ca 0.7 mm diam, reddish-brown to dark brown. Croat 8710.

Infrequent, in the Laboratory Clearing. Flowers and fruits mostly in the dry season (February to May). Baja California and Mexico south to Brazil; West Indies. In Panama, ecologically variable; known from tropical moist forest in the Canal Zone and Darien, from premontane dry forest and tropical dry forest in Coclé, from premontane moist forest in the Canal Zone, from premontane wet forest in Colón and Panama, and from tropical wet forest in Colón.