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8. Sphaeromeria simplex (A. Nelson) A. Heller, Muhlenbergia. 1: 7. 1900.
Laramie chickensage
Tanacetum simplex A. Nelson, Bull. Torrey Bot. Club 26: 484. 1899
Perennials, 1.5–2.5(–8) cm (cespitose, bases sometimes woody). Stems erect to decumbent, sericeous. Leaves mostly basal; blades (15–30 × 1.5–8 mm) pinnati-palmately lobed (lobes 2–3, linear, 1–2 mm wide) or linear, faces silvery-canescent. Heads borne singly. Involucres 4.5–7 mm. Phyllaries (12–)14–20+, midribs canescent or glabrous. Cypselae (light brown) 1.8–2.5 mm (faces finely striate).
Flowering May–Aug. Dry hills and slopes; of conservation concern; 2200–2700 m; Wyo.
Sphaeromeria simplex is in the Center for Plant Conservation’s National Collection of Endangered Plants.
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