Erect, 1-1 1/2 ft. high; branches numerous, subvirgate, the younger pubescent with short subplumose or barbellate hairs, glabresccnt; leaves opposite, erect, linear, acuminate, keeled, glabrous, 4-7 lin. long; inflorescence terminal; flowers solitary, or 2-nate, calycine; pedicels tomentose, 2 lin. long; bracts approximate, ovate-lanceolate, acuminate, concave, rigid, glumaceous, whitish, shorter than the sepals; sepals like the bracts, hut larger and somewhat spreading, the keel produced into a stout cuspidate point, the whole 2 1/2-3 lin. long, reaching to below the apex of the corolla-segments; corolla ovoid-urceolate, white, 3 1/2-4 lin. long; segments spreading, ovate-cordate, nearly as long as the tube; anthers lateral, affixed well above the base of the cells, oblong, subobtuse, 3/5 lin. long, crested; pore under 1/2 the length of the cell; crests ovate, acute, serrulate, nearly the length of the cell; ovary glabrous; ovules subovate, membrane-margined.
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Erect shrublet to 70 cm. Flowers medium, calycine, white sometimes with red stripes.