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FNA | Family List | FNA Vol. 9 | Rosaceae | Potentilla

58b. Potentilla rhyolitica Ertter var. chiricahuensis Ertter, J. Bot. Res. Inst. Texas. 1: 52, fig. 1H. 2007.

Chiricahua cinquefoil

Stems 0.2–1(–1.5) dm. Leaves green; long hairs of petioles 1–2(–3) mm; leaflets: hairs common, rarely dense. Flowers 1–5; filaments 2–3 mm; carpels 5–10, styles (2–)2.5–3 mm. Achenes 2 mm, smooth.

Flowering May–Jun. Rocky openings, in mixed conifer forests; of conservation concern; 2700–2900 m; Ariz.

Variety chiricahuensis is known only from the Chiricahua Mountains (Cochise County). It differs from the typical variety in being less densely hairy, with somewhat longer and coarser hairs and larger achenes. It is also less likely to be found rooted in outcrops, favoring rocky flats.


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