Smithsonian Contr. Knowl. 5(6): 73. 1853.
Perennials, 100–200 cm (bases woody). Stems branched, stipitate-glandular. Leaves alternate; petioles 20–35 mm; blades 3-nerved from bases, deltate-ovate or rhombic-ovate, 20–140 × 10–100 mm, bases truncate to cordate, margins irregularly dentate, apices acute, faces glanddotted or glandular-pubescent. Heads in paniculiform arrays. Peduncles 3–18 mm, stipitate-glandular. Involucres cylindric to campanulate, 7.5–8.5 mm. Phyllaries 22–26 in 5–6 series, greenish, often purple-tinged, 3–4-striate, unequal, margins narrowly scarious (apices obtuse to acute); outer ovate to lanceolate (glandular-hirtellous, shorter than inner), inner linear-lanceolate (glabrous). Florets 15–24; corollas pale yellow-green or greenish white, 5–6.5 mm. Cypselae 2–3 mm, strigose; pappi of 30–35 white, barbellulate bristles. 2n = 18.
Phenology: Flowering Aug–Oct.
Habitat: Near streams, canyon bottoms
Elevation: 1100–1800 m
Ariz., N.Mex., Mexico
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