Stems at first villous, finally glabrous; leaves imbricate, ovate-lanceolate, subacute, rounded at the base, at first silky-villous especially on the margin, 6 lin. long, 2 lin. wide; flowers in the axils of the upper leaves; bracteoles 2 lin. long, oblong, ciliate; calyx-tube pubescent outside, 9 lin. long, slender, cylindrical; lobes 2 lin. long, 3/4 lin. wide, ovate, subacute; petals 12, conical, pale yellow, 1/2 lin. long, surrounded by hairs slightly shorter than themselves; anthers 1 lin. long, apiculate; ovary oblong, 1 lin. long, glabrous; style filiform.
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