FNA: Ivesia argyrocoma vs. Ivesia setosa

	Ivesia argyrocoma	Ivesia setosa
	silver-hair ivesia, silverhair mousetail	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 argyrocoma	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	CA; nw Mexico [WildflowerSearch map] [BONAP county map]	NV; UT
Discussion	Varieties 2 (1 in the flora). Plants from the central Sierra San Pedro Mártir in northern Baja California belong to var. moranii Ertter & Reveal, which may be distinguished by its compact stature (to 0.5 dm), densely villous basal stipules 2–4 mm, decumbent stems 2–7 cm that are stipitate-glandular under the villous indumentum, and solitary, loosely congested cyme. The petals are oblanceolate to narrowly obovate and 2.5–3.5 mm. The grayish, faintly mottled achenes are 1.3–2 mm. (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.)
Source	FNA vol. 9, p. 242.	FNA vol. 9, p. 227.
Parent taxa	Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Unguiculatae	Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae
Sibling taxa	I. aperta, 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. setosa, I. shockleyi, I. tweedyi, I. unguiculata, I. utahensis, I. webberi	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
Subordinate taxa	I. argyrocoma var. argyrocoma
Synonyms	Horkelia argyrocoma, Potentilla argyrocoma	I. baileyi var. setosa, Potentilla baileyi var. setosa
Name authority	(Rydberg) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 284. (1908)	(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	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

silver-hair ivesia, silverhair mousetail

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 argyrocoma

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

CA; nw Mexico

[WildflowerSearch map]

[BONAP county map]

NV; UT

Discussion

Varieties 2 (1 in the flora).

Plants from the central Sierra San Pedro Mártir in northern Baja California belong to var. moranii Ertter & Reveal, which may be distinguished by its compact stature (to 0.5 dm), densely villous basal stipules 2–4 mm, decumbent stems 2–7 cm that are stipitate-glandular under the villous indumentum, and solitary, loosely congested cyme. The petals are oblanceolate to narrowly obovate and 2.5–3.5 mm. The grayish, faintly mottled achenes are 1.3–2 mm.

(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.)

Source

FNA vol. 9, p. 242.

FNA vol. 9, p. 227.

Parent taxa

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

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

Sibling taxa

I. aperta, 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. setosa, I. shockleyi, I. tweedyi, I. unguiculata, I. utahensis, I. webberi

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

Subordinate taxa

I. argyrocoma var. argyrocoma

Synonyms

Horkelia argyrocoma, Potentilla argyrocoma

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

Name authority

(Rydberg) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 284. (1908)

(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 argyrocoma

Ivesia setosa

Ivesia argyrocoma

Ivesia setosa