Small, glabrous and glaucous tree ( "woody herb") 2-4 m. tall from a stout taproot; leaves ovate-deltoid, the blade 3-4 dm. long, the leaflets lanceolate, 2-6 cm. long, spinulose-serrate and laciniately lobed, paler beneath, the petiolules with a membranaceous stipular ring, the petiole with a conspicuous, inflated sheath; cauline leaves reduced upward, sometimes bladeless; peduncles 3-8 cm. long, glandular-puberulent above; involucre of 1-3 linear bracts to 2.5 cm. long, the involucel of several entire to cleft bractlets 5-10 mm. long and exceeding the flowers; fruiting rays unequal, 3-6 cm. long, glandular-puberulent on the angles, the pedicels 7-9 mm. long, glandular-puberulent; fruit linear, 15-20 mm. long.
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