Glabrous. Leaves opposite; lamina oblong to elliptic or spathulate, 1.8-4(-6) by 1.5-3 cm, cuneate at the base to a petiole 4-7 mm long, mostly rounded (rarely acuminate and acute) at the apex, dull on both sides or somewhat lustrous above, recurved at the margins; venation pinnate with the midrib usually visible and the main laterals diverging near the base. Inflorescencess at the nodes, a single pedicellate flower on a slender ebracteate peduncule 2-4(-6) mm long ( I.c., a flower on a jointed 'pedicel'); pedicel 1.5-3 mm long, slender, wider at the apex, usually with a single bract. Corolla in mature bud 4-merous, (13-)20-35 mm long, quadrangular, sometimes winged, acute or obtuse at the apex, mostly dark pink, red or purple, often paler or shading to yellow or green above. Anther 2-3 mm long, about half as long as the free part of the filament. Fig. 6c.
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