Ivesia setosa
Ivesia pityocharis
bristly ivesia
pine nut mountain mousetail, pine nut mountains ivesia
± ascending to nearly erect, 0.7–2.5(–2.8) dm.
prostrate-decumbent to ascending, 0.5–2(–3) dm.
weakly planar to loosely cylindric, 5–9(–12) cm; sheathing base ± strigose abaxially;
petiole 1–8 cm;
lateral leaflets 5–10 per side, separate to overlapping distally, ± flabellate, 2–8 mm, incised ± 3/4 to base, sometimes nearly to base, into (3–)7–11 ovate teeth to narrowly obovate lobes, apex usually ± setose, surfaces ± sparsely hirsute, conspicuously glandular;
terminal leaflets ± indistinct.
6–12(–15) cm; sheathing base weakly strigose abaxially;
stipules absent;
petiole (1–)1.5–2.5(–3) cm, hairs abundant, ascending to spreading, 1–4 mm;
leaflets 15–25 per side, loosely overlapping, (1.5–)2–7 mm, lobes 0–4(–6), lanceolate or oblanceolate to elliptic, hairs abundant, spreading to ascending, 1–3 mm.
(0–)1;
blade vestigial.
2–5.
(1–)5–15(–30)-flowered, ± open, 1–6(–12) cm diam.
(7–)15–50-flowered, 2–8 cm diam., flowers arranged individually and/or in several to many loose few-flowered glomerules.
5–15(–20) mm.
(3–)6–15(–22) mm.
7–10 mm diam.;
epicalyx bractlets 5, lanceolate, 1.3–2.5(–3) mm;
hypanthium patelliform, (1–)1.5–2 × 2–3.5(–4) mm;
sepals (1.5–)2–3.5 mm, ± acute;
petals yellow, oblanceolate to narrowly spatulate, 1.5–2.5 mm;
stamens 5, filaments 0.8–1.5 mm, anthers yellow, oblong, 0.4–0.7 mm;
carpels 2–8, styles 1.2–2 mm.
8–13 mm diam.;
epicalyx bractlets lanceolate to elliptic, 2–3 mm;
hypanthium patelliform to shallowly cupulate, 1.5–2.5 × 3–4.5 mm, ± 1/2 as deep as wide;
sepals often purple-suffused, 2.3–4(–5) mm, acute;
petals white, broadly spatulate or obovate to orbiculate, (2.8–)3–5(–6) mm;
stamens 20, filaments filiform, (1–)1.5–3 mm, anthers light pink, 0.3–0.5 mm;
carpels 8–20, styles 2.2–3 mm.
greenish white to light tan, 1.7–2 mm, smooth, ± carunculate.
light brown, 1.2–1.3 mm.
Ivesia setosa
Ivesia pityocharis
Ivesia setosa occurs mostly to the east and south of I. baileyi, from southeastern Humboldt and Churchill counties to Elko, White Pine, and northern Nye counties, Nevada, and in the Deep Creek Range of western Utah. It represents a transition between the planar-leaved, chasmophytic members of sect. Setosae and the cylindric-leaved, matted species of flatter sites. Stems of I. setosa are more generally erect than in other species in the section, and the usually calcareous substrate is noteworthy. The deeply incised (usually not quite to base) leaflets are somewhat intermediate between the toothed leaflets of I. baileyi and the leaflets of I. shockleyi that are incised to the base into separate lobes. The individual leaflets of both I. baileyi and I. setosa are more or less flat and distichously paired; in I. shockleyi, groups of leaflet lobes are folded over onto each other, giving a verticillate appearance to the leaflet arrangement.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Ivesia pityocharis is known only from the Pine Nut Mountains, Douglas County. Plants are somewhat intermediate between those of I. kingii and I. sericoleuca in having relatively shallow hypanthia and loosely sericeous vestiture. Hairs on petioles and stem bases of I. pityocharis are to 4 mm; those of I. kingii are 1 mm and generally appressed-ascending.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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USDA Plants Database
