2-4 ft. high; branches erect, rather straight, when young covered with a floccose pubescence of minutely plumose hairs; leaves 3-nate, mostly erect and closely imbricate, sometimes subspreading, linear to oblong or narrow-elliptic, sulcate, shortly ciliate, glabrous, smooth, shining, the floral often dilated, with a scarious margin, 2-3 lin. long; flowers 3-nate, on short branchlets for some distance along the branches, at length cernuous; pedicels floccose, 1 1/2-2 lin. long; bracts approximate, broad ovate, 4-5 lin. long; sepals erect, oval-oblong, obtuse, glabrous, white, 6-7 lin. long; corolla elongate-ovoid-urceolate, contracted at the throat, glabrous, white, 9-11 lin. long; limb nearly erect, obtuse, about 1/8 of the tube in length; filaments rather broad, red-nerved, 4-5 lin. long; anthers mostly included, linear-cuneate, subacute, smooth, shining, black, 2-2 1/4 lin. long, crested; pore 1/3-1/2 the length of the cell; crests pendulous, lanceolate, acute, serrulate, 1/2 the length of the cells or less; style included; stigma simple; ovary globular, glabrous, small.
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Erect, sparsely branched shrub to 1.5 m. Flowers large, calycine, ovoid-conical, white with conspicuous white leaves below flowers.