Exostema longiflorum (Lamb.) Schult.

Exostema longiflorum (Lamb.) R. & S. Syst. Veg. 5: 18
1819.
Cinchona longiflora Lamb. Descr. Cinchona 38. 1797.
Shrub, 1-2 meters high, the branches stout or slender, gray or brownish, puberulent or
villosulous when young, usually densely leafy; stipules oblong or lanceolate, 2.5-6 mm. long,
acuminate or attenuate, thin, green, puberulent; petioles slender or stout, 3-12 mm. long,
rarely wanting; leaf-blades linear-lanceolate, very narrowly lance-elliptic, or oblanceolate,
5-11 cm. long, 0.8-2.5 cm. wide, long-attenuate at the base, usually long-attenuate to the
acutish apex, membranaceous, bright-green, sparsely white-pilose beneath in the axils of the
chief veins, elsewhere glabrous, the costa impressed above, prominent beneath, the lateral
veins evident, few, distant, ascending, the margin usually plane; flowers axillary and solitary
or 1-3 at the ends of the branches, the pedicels stout, shorter than the calyx; hypanthium
cylindric, 6-8 mm. long, glabrous; calyx-lobes 5, linear-subulate, 3-6 mm. long; corolla white
or pink, glabrous, the tube 12-14 cm. long, 2-2.5 mm. thick, curved, the 5 lobes linear, 4-5 cm.
long, recurved; stamens exserted, the anthers linear, about 2 cm. long; capsule oval-ellipsoid,
about 1.5 cm. long, coarsely costate, the valves about 8 mm. wide after dehiscence.
Type locality: Given as Guiana [an error for Santo Domingo]. Distribution: Along streams, Cuba and Hispaniola.

Exostema longiflorum là một loài thực vật có hoa trong họ Thiến thảo. Loài này được (Lamb.) Schult. mô tả khoa học đầu tiên năm 1819.