LEAVES basal and stem, alternate, simple, deeply lobed to toothed to entire, clasping at least below, sessile, 3.5–25 cm long by 1–20 cm wide, reduced above, often with axillary growth; lower stem leaves with a partial twist near the stem exposing the dorsal (lower) side of the blade and the midrib with one row of prickles 1–5 mm long (not hurtful) along most of its length, prickles absent on smaller leaves and near the blades’ apices, glabrous above, the margins irregular with short prickles; upper stem blades mostly entire and with fewer prickles; subtending leaves (bracts) of floral branches 0.4–20 cm long by 0.3–9.5 cm wide; auricles pointed, toothed.
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