Leaves
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Leaves in whorls of usually 9-15, narrowly sword-shaped, usually 15-50 cm long, 0.4-1.5 cm wide, closely
15-50-nerved, upper surface very sparsely silky, lower surface glabrous to moderately silky, sometimes densely so toward base, both surfaces occasionally minutely glandular and slightly viscid, margins ascending white silky tomentose, basally connate, forming a viscid-glandular, closely sheathing cylinder 1.5-6.5 cm long.
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Flowers
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Heads usually 40-350(-520) arranged in usually 6-20 verticils, each with 7-15 primary branched peduncles, in elongate, lax inflorescences 3-10 dm long, 1.5-4.5 dm in diameter, peduncles capitate-glandular with hairs usually less than 1 mm long; receptacle broadly rounded, false involucre consisting of usually 10-25 bracts 8-15 mm long; florets ca. 30-225 per head, corollas cream-colored, 4.5-6.5 mm long, distal lobes ca. 0.7-1 mm long; pappus of 7-11(-13) rigid, lanceolate scales 1-3.5 mm long.
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