Weak diffuse shrub to 50 cm high, glabrous except woolly in leaf axils. Branches slender, striate. Leaves subterete to narrowly fusiform, 10–20 mm long, acute. Flowers solitary but clustered in terminal spike-like groups, bisexual, glabrous. Fruiting perianth glabrous, pale green to gold or pale red when fresh, black when dry; tube convex, smooth, thick-walled with a thick hard base; wing horizontal, simple, 12–16 mm diam., without a radial slit; upper perianth prominently convex, hard, covered with numerous erect hair-like processes up to 6 mm long.
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