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FNA | Family List | FNA Vol. 20 | Asteraceae | Pyrrocoma

9. Pyrrocoma liatriformis Greene, Leafl. Bot. Observ. Crit. 2: 17. 1909.

Palouse goldenweed

Haplopappus integrifolius Porter ex A. Gray subsp. liatriformis (Greene) H. M. Hall; H. integrifolius subsp. scaberulus (Greene) H. M. Hall; H. liatriformis (Greene) H. St. John; H. racemosus (Nuttall) Torrey subsp. liatriformis (Greene) D. D. Keck

Plants 25–70 cm. Stems 1–3, erect, sometimes curved-ascending, sparsely villous to tomentose, eglandular. Leaves: basal blades lanceolate to oblanceolate, 80–310 × 9–30 mm, margins entire or undulate, ciliate; cauline sessile, blades lanceolate, 30–120 × 5–20 mm; faces sparsely tomentose, eglandular. Heads 4–12 in open, racemiform arrays. Peduncles 0–3 cm. Involucres campanulate, 10–23 × 12–20 mm (in axils of leafy bract). Phyllaries in 4–5 series, green, lanceolate, 5–12 mm, unequal, margins entire, ciliate, apices acute, faces villous. Ray florets 17–25; corollas 6–14.5 mm. Disc florets 35–60; corollas 7–11 mm. Cypselae narrowly oblong, 4.5–6.5 mm, 4-angled, faces striate, villous; pappi tawny, 5.8–8 mm. 2n = 36.

Flowering Jul–Aug. Prairies, roadsides; of conservation concern; 700–1100 m; Idaho, Wash.

Pyrrocoma liatriformis is one of the dominants of virgin Palouse prairies and appears to be threatened. It is recognized by its hirsute stems, leaves, and phyllaries, and the small, pedunculate heads.


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