Macrosolen bibracteolatus Danser

Glabrous. Leaves opposite; lamina narrowly ovate to ovate, mostly 8-12 cm long, 2-6 cm wide, cuneate at the base to a petiole 1-3 mm long, acuminate and acute or obtuse at the apex, glossy above, dull below; venation pinnate with the midrib and the main laterals distinct above and the midrib prominent below. Inflorescences at the nodes, an umbel of 1 opposite pair of flowers; axis 1-4 mm long; pedicels 1-4 mm long; bracts 0.8-1.5 mm long, concave, somewhat appressed at the bud stage, the laterals ones connate. Corolla in mature bud 6-merous, 25-35 mm long, often curved near the base, gradually widened upwards, winged in the upper part, clavate and obtuse at the apex, pink or red, sometimes yellow or green above; tube in the open flower 16-24 mm long with the lobes reflexed or twisted slightly higher. Anther c. 4 mm long, obtuse, equal to or shorter than the free part of the filament.