Ivesia cryptocaulis
Ivesia setosa
Charleston Peak ivesia, Charleston Peak mousetail
bristly ivesia
prostrate to decumbent, 0.2–0.6(–1) dm.
± ascending to nearly erect, 0.7–2.5(–2.8) dm.
tightly cylindric, 1–4(–5) cm; sheathing base mostly not strigose abaxially;
petiole 0.3–2 cm, hairs 0.5–1 mm;
lateral leaflets 5–10(–12) per side, ± overlapping, ± flabellate, 1–2.5 mm, incised to base or nearly so into 3–5 obovate to oval lobes, apex sometimes ± setose, surfaces loosely long-strigose, sparsely glandular;
terminal leaflets indistinct.
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.
1(–2);
blade vestigial.
(0–)1;
blade vestigial.
1–10-flowered, ± congested, 0.5–1.5 cm diam.
(1–)5–15(–30)-flowered, ± open, 1–6(–12) cm diam.
3–7(–10) mm.
5–15(–20) mm.
6–9 mm diam.;
epicalyx bractlets 5, lanceolate to narrowly oblong or narrowly ovate, 0.8–1.3 mm;
hypanthium shallowly cupulate, ± 1 × 2–3(–4) mm;
sepals 1.5–2.3 mm, ± acute;
petals yellow, oblanceolate to spatulate, 2–3.2 mm;
stamens 5, filaments 0.9–1.2 mm, anthers yellow, oblong, 0.7–0.9 mm;
carpels 6–10, styles 1–1.5 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.
greenish cream to light brown, 1.4–1.8(–2) mm, smooth, not carunculate.
greenish white to light tan, 1.7–2 mm, smooth, ± carunculate.
Ivesia cryptocaulis
Ivesia setosa
Of conservation concern.
Ivesia cryptocaulis is known only from timberline and above in the Spring Mountains of Clark County. Plants differ from all others of the genus by having slender, elongate, diffuse caudex branches that ramify through its habitat of gravel, scree, and talus. The species is here provisionally included in sect. Setosae as a diffusely matted relative of I. shockleyi (as also suggested by D. D. Keck 1938); the ecarunculate seeds and relatively straight pedicels may indicate a greater similarity to I. pygmaea in sect. Ivesia.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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WildflowerSearch
iNaturalist
USDA Plants Database
