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1b. Sphaeromeria potentilloides (A. Gray) A. Heller var. nitrophila (Cronquist) A. H. Holmgren, L. M. Shultz & Lowrey, Brittonia. 28: 261. 1976.
Tanacetum potentilloides (A. Gray) A. Gray var. nitrophilum Cronquist, Leafl. W. Bot. 6: 49. 1950; Vesicarpa potentilloides (A. Gray) Rydberg var. nitrophilum (Cronquist) Kartesz
Plants 3–15 cm. Leaves mostly basal; basal mostly 1-pinnately lobed; cauline (2–)3-fid or entire. Heads 1–3(–4). Involucres 4–5.1 mm. 2n = 18.
Flowering May–Jul. Highly alkaline sites; 1600–2200 m; Calif., Idaho, Nev.
Variety nitrophila grows in northern and central Nevada and in the hills north of Snake River Plains in Idaho.
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