Ivesia rhypara var. shellyi
Ivesia rhypara
Shelly's ivesia, Shelly's mousetail
grimy ivesia, grimy mousetail
(0.1–)0.2–0.5(–0.9) dm, equal to or exceeding leaves by no more than 2(–7) cm.
± prostrate, (0.1–)0.2–1.5(–2) dm.
tightly cylindric, 2–10 cm; sheathing base densely hairy abaxially;
petiole 0.5–4(–10) cm;
lateral leaflets 4–10(–15) per side, overlapping at least distally, ± flabellate, 0.5–3(–4) mm, incised to base or nearly so into (0–)2–4(–9) elliptic to obovate or orbiculate lobes, apex usually not setose, surfaces densely hirsute, cryptically glandular;
terminal leaflets indistinct.
(0–)1;
blade vestigial.
5–30(–60)-flowered, 0.5–2(–5) cm diam. 2n = 28.
5–60(–100)-flowered, congested, 0.5–5(–7) cm diam.
1.5–4(–8) mm.
4–8 mm diam.;
epicalyx bractlets 5, linear to elliptic or narrowly ovate, 0.8–1.6(–2.1) mm;
hypanthium patelliform to shallowly cupulate, 1–1.5 × (1.5–)2–3(–3.5) mm;
sepals 1.4–2.5(–2.8) mm, acute;
petals white to pale yellowish, linear to narrowly oblanceolate, 1–1.5 mm;
stamens 5, filaments 0.6–1.8 mm, anthers maroon or yellow with maroon margins, oblong, 0.3–0.6 mm;
carpels 1–2(–4), styles 1–1.5 mm.
brown, 1.2–1.6(–2) mm, smooth, prominently carunculate.
Ivesia rhypara var. shellyi
Ivesia rhypara
Of conservation concern.
In addition to their more overtly petrophytic habit, plants of var. shellyi are generally smaller and more compact than those of var. rhypara. It is known only from the Rehart and Venator canyons area along the border of Harney and Lake counties in southeastern Oregon.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Varieties 2 (2 in the flora).
Ivesia rhypara forms densely hairy mats or mounds on isolated edaphic sites in the northern Great Basin. Only one of the widely disjunct population clusters is recognized as a distinct variety; the others have general differences in gestalt, but no significant distinctions have been determined (B. Ertter 1989). Isozyme analysis likewise does not show significant differences (T. Kaye et al., unpubl., BLM and Oregon Dept. of Agriculture, 1991). Reproductive studies by D. Wiens (pers. comm.) show low seed set (ca. 5% in var. rhypara, somewhat higher in var. shellyi), possibly indicating a deleterious genetic load.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Plants (4–)8–30 cm diam.; inflorescences (1–)2–5(–7) cm diam.; scarcely or cryptically petrophytic in bedrock overlain by rubble and soil. | var. rhypara |
1. Plants 2–10(–15) cm diam.; inflorescences 0.5–2(–5) cm diam.; overtly petrophytic in boulders and outcrops. | var. shellyi |
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
CalFlora
