Shrub 0.5-6 m tall. Branchlets sericeous or glabrous and glaucous. Leaves dorsiventral or dipleural, 4-22 cm long, entire and linear, or rarely 2-or 3-sect with ascending linear lobes; simple leaves 0.8-2.0 mm wide; ultimate lobes of divided leaves 0.7-1.2 mm wide; margins revolute; lower surface enclosed except for midveins, 2-grooved (grooves lateral in subsp. cullenii ). Conflorescence terminal and axillary, erect, simple or to 6-branched; unit conflorescence narrowly conical to cylindrical, acropetal; ultimate floral rachis 50-100 mm long, glabrous or sparsely silky. Flowers acroscopic. Perianth pilose inside near base. Pistil 5-9.5 mm long; style exserted from late bud; pollen-presenter oblique at c. 45º, truncate-conical with a basal flange. Follicle obloid-ellipsoidal to slightly obovoid, (5-) 7-15 mm long, tuberculate to almost smooth; pericarp usually weakly exfoliating and sometimes faintly viscid.
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