Grimy or Grimes’s ivesia

Plants (4–)8–30 cm diam. Stems (0.3–)0.4–1.5(–2) dm, usually exceeding leaves by more than 2 cm. Inflorescences 10–60(–100)-flowered, (1–)2–5(–7) cm diam.

Flowering summer. Scarcely or cryptically petrophytic in ash tuff bedrock overlain by dry soil and pulverized rubble, in sagebrush communities, sometimes juniper woodlands; of conservation concern; 1400–1900 m; Nev., Oreg.

Variety rhypara is known from widely scattered locations in central Malheur and southeastern Lake counties, Oregon, and in northern Washoe, Humboldt, and Elko counties, Nevada. Although not overtly petrophytic, plants are generally associated with crevices in the underlying bedrock (E. M. Clark and W. H. Clark 2003). They might thereby benefit from a more favorable water relationship, allowing them to be in full bloom when most associated species are summer-dormant.