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

58a. Potentilla rhyolitica Ertter var. rhyolitica

Huachuca cinquefoil

Stems 0.3–2 dm. Leaves gray-green; long hairs of petioles 1(–2) mm; leaflets: hairs usually dense, sometimes common. Flowers 2–10; filaments 1.5–2.5 mm; carpels 5–15, styles 2–2.5 mm. Achenes 1.5 mm, smooth to lightly rugose.

Flowering Apr–Jun. Rhyolite and quartzite outcrops, in open pine forests; of conservation concern; 2600–2900 m; Ariz.

Variety rhyolitica forms dense tufts in outcrops near the summits of the Huachuca and Santa Rita ranges (Cochise and Santa Cruz counties). The name Potentilla viscidula (Rydberg) Rydberg (= P. wheeleri var. viscidula Rydberg) was misapplied to these plants by T. H. Kearney and R. H. Peebles (1951); that name has been lectotypified on the hybrid of P. rhyolitica and P. subviscosa (B. Ertter 2007c).


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