Potentilla rhyolitica var. rhyolitica
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.
Phenology: Flowering Apr–Jun.
Habitat: Rhyolite and quartzite outcrops, in open pine forests
Elevation: 2600–2900 m
Of conservation concern.
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).
"dm" is not declared as a valid unit of measurement for this property.