Flora of North America species comparison

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Ivesia santolinoides

Ivesia webberi

mouse tail ivesia, Sierra mousetail, silver mousetail, stellariopsis

Webber's ivesia, wire ivesia, wire mousetail
Habit Plants ± grayish to silvery. Plants ± green, ± rosetted; taproot slender to ± stout, not fleshy.
Stems

ascending to erect, (1–)1.5–4 dm.

decumbent to ascending, 0.5–1.5(–1.8) dm.
Basal leaves

mousetail-like (individual leaflets scarcely distinguishable), 3–10 cm; sheathing base densely strigose abaxially;

petiole 0.5–1.5 cm;

leaflets 60–80 per side, 0.6–1.5 mm, lobes (0–)3–5, obovate to oval, densely villous.

loosely ± cylindric, 3–7(–10) cm; sheathing base ± strigose abaxially;

petiole 0.5–5(–6) cm, hairs 2–4 mm;

leaflets 4–8(–10) per side, (0.5–)3–8(–10) mm, loosely long-strigose or -villous and short-hirsute, ± glandular, lobes 2–5(–12), linear to lanceolate, apex not setose.
Cauline leaves

2, paired.
Inflorescences

(10–)30–200-flowered, 3–8(–30) cm diam.

5–15(–25)-flowered, 1.5–3(–6) cm diam.;

glomerules 1.
Pedicels

5–30 mm.

(0.5–)1–8(–13) mm.
Flowers

5–8 mm diam.;

epicalyx bractlets oblong to broadly ovate or orbiculate, 0.2–0.5 mm;

hypanthium 0.5–1.5 × 2–3 mm;

sepals 1–2 mm, apex obtuse to acute;

petals white, broadly obovate to orbiculate, 2–2.5 mm;

stamens 15, filaments 1.2–1.8 mm, anthers purple, broadly obcordate to pouch-shaped, 0.3–0.4 mm;

carpels 1, styles 2–3 mm.

9–12 mm diam.;

epicalyx bractlets linear, 1.2–3 mm;

hypanthium cupulate, 1–2(–2.5) × 2.5–5 mm;

sepals 2.5–4.5(–5.5) mm, acute;

petals yellow, narrowly oblanceolate, 2–3(–4) mm;

stamens 5, filaments 1.8–2.5(–3) mm, anthers yellow, (0.8–)1–1.6 mm;

carpels 3–8, styles 1.8–2.2 mm.
Achenes

mottled grayish brown, 1.7–2 mm.

light brown, often mottled darker brown, 1.9–2.5 mm.
2n

= 28.

Ivesia santolinoides

Ivesia webberi
Phenology Flowering summer. Flowering late spring–early summer.
Habitat Dry sandy granitic soil, decomposed granite accumulations, ledges and outcrops, in montane and subalpine conifer woodlands Dry flats and slopes, in sagebrush communities, conifer woodlands
Elevation 1500–3600 m (4900–11800 ft) (1300–)1500–1900 m ((4300–)4900–6200 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; NV
[BONAP county map]
Discussion

Ivesia santolinoides is found on loose granitic substrates in the Sierra Nevada, Transverse Ranges, and San Jacinto Mountains from El Dorado to Riverside counties. The species is easily recognized by its silvery mousetail-like leaves and erect, diffuse inflorescences with small, plumlike flowers.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Of conservation concern.

Ivesia webberi is known only from the eastern foothills of the northern Sierra Nevada and scattered ranges to the east in California and adjacent Nevada. It is among the more distinctive species in the genus and is only tentatively placed in sect. Ivesia. The leaflets are loosely incised into slender, sparsely villous segments, and the two cauline leaves are paired with dissected stipules. Previous reports of the stems and inflorescence branches being glandular-puberulent are due to a misinterpretation of the minute pustulose bases associated with the villous indumentum as being enlarged glands.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 246. FNA vol. 9, p. 236.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Stellariopsis Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia
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. 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. setosa, I. shockleyi, I. tweedyi, I. unguiculata, I. utahensis
Synonyms Potentilla santolinoides, Stellariopsis santolinoides Potentilla webberi
Name authority A. Gray: Proc. Amer. Acad. Arts 6: 531. (1865) A. Gray: Proc. Amer. Acad. Arts 10: 71. (1874)
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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