FNA: Ivesia setosa

	Ivesia setosa
	bristly ivesia
Habit	Plants green, tufted to ± densely matted.
Stems	± ascending to nearly erect, 0.7–2.5(–2.8) dm.
Basal leaves	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.
Cauline leaves	(0–)1; blade vestigial.
Inflorescences	(1–)5–15(–30)-flowered, ± open, 1–6(–12) cm diam.
Pedicels	5–15(–20) mm.
Flowers	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.
Achenes	greenish white to light tan, 1.7–2 mm, smooth, ± carunculate.

	Ivesia setosa
Phenology	Flowering summer.
Habitat	Dry, rocky talus slopes, boulders and outcrops, most often but not always of calcareous origin, occasionally away from immediate outcrops, sagebrush communities, conifer woodlands
Elevation	1800–2600(–3100) m (5900–8500(–10200) ft)
Distribution	NV; UT
Discussion	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.)
Source	FNA vol. 9, p. 227.
Parent taxa	Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae
Sibling taxa	I. aperta, I. argyrocoma, I. arizonica, I. baileyi, I. callida, I. campestris, I. cryptocaulis, I. gordonii, I. jaegeri, I. kingii, I. longibracteata, I. lycopodioides, I. muirii, I. multifoliolata, I. paniculata, I. patellifera, I. pickeringii, I. pityocharis, I. pygmaea, I. rhypara, I. sabulosa, I. santolinoides, I. saxosa, I. sericoleuca, I. shockleyi, I. tweedyi, I. unguiculata, I. utahensis, I. webberi
Synonyms	I. baileyi var. setosa, Potentilla baileyi var. setosa
Name authority	(S. Watson) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 290. (1908)
Web links	Local Web sites: CalFlora, CalPhotos WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Ivesia setosa

bristly ivesia

Habit

Plants green, tufted to ± densely matted.

Stems

± ascending to nearly erect, 0.7–2.5(–2.8) dm.

Basal leaves

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.

Cauline leaves

(0–)1;

blade vestigial.

Inflorescences

(1–)5–15(–30)-flowered, ± open, 1–6(–12) cm diam.

Pedicels

5–15(–20) mm.

Flowers

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.

Achenes

greenish white to light tan, 1.7–2 mm, smooth, ± carunculate.

Ivesia setosa

Phenology

Flowering summer.

Habitat

Dry, rocky talus slopes, boulders and outcrops, most often but not always of calcareous origin, occasionally away from immediate outcrops, sagebrush communities, conifer woodlands

Elevation

1800–2600(–3100) m (5900–8500(–10200) ft)

Distribution

NV; UT

Discussion

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.)

Source

FNA vol. 9, p. 227.

Parent taxa

Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae

Sibling taxa

I. aperta, I. argyrocoma, I. arizonica, I. baileyi, I. callida, I. campestris, I. cryptocaulis, I. gordonii, I. jaegeri, I. kingii, I. longibracteata, I. lycopodioides, I. muirii, I. multifoliolata, I. paniculata, I. patellifera, I. pickeringii, I. pityocharis, I. pygmaea, I. rhypara, I. sabulosa, I. santolinoides, I. saxosa, I. sericoleuca, I. shockleyi, I. tweedyi, I. unguiculata, I. utahensis, I. webberi

Synonyms

I. baileyi var. setosa, Potentilla baileyi var. setosa

Name authority

(S. Watson) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 290. (1908)

Web links

Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).

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Ivesia setosa

Ivesia setosa