Erect or straggling shrub or small tree, 0.6-4 m tall. Branchlets glabrous. Leaves linear or narrowly elliptic, 2-8 cm long, 2-7 mm wide, thin, cuneate, entire or 1-5-toothed, acute, glabrous; mucro 1.5-2 mm long. Inflorescence with 16-20 flowers; involucre 5.5-7.5 mm long; rachis glabrous; pedicels 2.5-4.5 mm long, glabrous. Perianth 3-5 mm long, white, glabrous. Fruit obliquely obovate with recurved apex, 1.5-2.5 cm long, 0.7-1 cm wide, finely rugose, sometimes scattered black-pusticulate; horns 2.5-4 mm long. Seed obliquely obovate, c. 12 mm long; wing apical or partly down one side of seed body.
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