Ivesia setosa
Ivesia baileyi
bristly ivesia
Bailey's ivesia, Owyhee ivesia
± ascending to nearly erect, 0.7–2.5(–2.8) dm.
pendent or prostrate to ascending, 0.5–2(–2.5) 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.
planar, 3–12(–18) cm; sheathing base not or sparsely strigose abaxially;
petiole 1–8 cm;
lateral leaflets 2–6(–10) per side, separate to slightly overlapping distally, ovate or obovate to flabellate, 4–15(–25) mm, incised 1/4–3/4 to base into 3–11(–15) ovate to oblanceolate teeth or lobes, apex not setose, surfaces ± sparsely short-pilose or hirsute, ± glandular;
terminal leaflets ± distinct.
(0–)1;
blade vestigial.
1–2;
blade reduced.
(1–)5–15(–30)-flowered, ± open, 1–6(–12) cm diam.
(1–)5–40-flowered, open, (1–)1.5–8(–10) cm diam.
5–15(–20) mm.
2–15(–30) 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.
4–10 mm diam.;
epicalyx bractlets 5, narrowly lanceolate to ovate, 0.8–2.5 mm;
hypanthium patelliform, 0.5–2 × 2–4 mm;
sepals (1.2–)1.5–4 mm, acute;
petals white or pale yellow, oblanceolate to narrowly spatulate, 1.5–2.5 mm;
stamens 5, filaments 0.5–1.1 mm, anthers yellow, sometimes with reddish margins, oblong, 0.4–0.7 mm;
carpels (1–)3–8, styles 0.9–1.8 mm.
greenish white to light tan, 1.7–2 mm, smooth, ± carunculate.
greenish white to light tan, 1.5–2 mm, smooth or rugose, ± carunculate.
Ivesia setosa
Ivesia baileyi
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.)
Varieties 2 (2 in the flora).
The two varieties accepted here were not recognized by D. D. Keck (1938), who instead treated Ivesia setosa as a variety of I. baileyi. Field investigations confirm that the three entities are reasonably distinct morphologically, with intergradation where their otherwise distinct ranges overlap in central Nevada.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Petals pale yellow; hypanthium interior yellow to golden; epicalyx bractlets ± 3/4 to as long as sepals; achenes smooth. | var. baileyi |
1. Petals white; hypanthium interior pale green or cream to maroon; epicalyx bractlets usually less than 1/2 as long as sepals; achenes rugose. | var. beneolens |
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