Glabrous except for young shoots, inflorescences and flowers white to red-brown stellate hairy and sometimes eventually glabrescent. Leaves scattered; lamina elliptic to ovate or obovate, 3-11 by 2-6 cm, thin, attenuate or cuneate at the base to a sometimes obscure petiole (1—)3—10 mm long, acute to rounded at the apex, dull on both sides but slightly darker above; venation pinnate but somewhat curvinerved, with the midrib and main laterals raised below and obscure or visible above. Inflorescences usually several at the nodes, a 2-to 4-flowered raceme, sometimes subumbellate, sometimes prolonged slightly beyond the flower pedicels; axis (0.75-)2-5 mm long; pedicels 0.75-4 mm long. Corolla in mature bud 4-or 5-merous, 11—15(—18) mm long, abruptly inflated 1 mm above the base to 5 mm wide, winged from base to apex, angular towards the apex but finally rounded, yellow below and red above; tube in the open flower 3—4.5(—11) mm long with the lobes reflexed 4 mm higher. Anther 1-3 mm long, obtuse, about 0.5-1.5 times as long as the free part of the filament.
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