Ivesia paniculata
Ivesia setosa
Ash Creek ivesia, Ash Creek mousetail
bristly ivesia
± prostrate, 0.4–1.5(–2) dm.
± ascending to nearly erect, 0.7–2.5(–2.8) dm.
tightly cylindric, (1.5–)2–5(–7) cm; sheathing base densely hairy abaxially;
petiole 0.5–4 cm;
lateral leaflets (5–)8–15 per side, overlapping at least distally, ± flabellate, 0.5–2 mm, incised to base or nearly so into (0–)3–8(–15) elliptic to narrowly obovate lobes, apex not or obscurely setose, surfaces densely hirsute, cryptically 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.
(0–)1;
blade reduced.
(0–)1;
blade vestigial.
20–200-flowered, congested, (1–)1.5–6(–10) cm diam.
(1–)5–15(–30)-flowered, ± open, 1–6(–12) cm diam.
1.5–6 mm.
5–15(–20) mm.
4–6 mm diam.;
epicalyx bractlets 5, lanceolate to elliptic, 0.6–1.5(–2) mm;
hypanthium shallowly cupulate, 1 × 2–3 mm;
sepals (1–)1.5–2.5(–3) mm, acute;
petals white to pale yellowish, linear, 1 mm;
stamens 5, filaments 0.3–1 mm, anthers yellow with maroon margins, ovate, 0.3–0.5 mm;
carpels 1–2(–3), styles 0.7–1.8 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.
brown, 0.8–1.5 mm, smooth, prominently carunculate.
greenish white to light tan, 1.7–2 mm, smooth, ± carunculate.
Ivesia paniculata
Ivesia setosa
Of conservation concern.
Ivesia paniculata is known only from the Ash Valley area of Lassen County. The distinctions between I. paniculata and I. rhypara are perhaps on the same scale as variation among disjunct population clusters of I. rhypara, but no taxonomic adjustments are proposed at this time.
(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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