Flora of North America species comparison

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Ivesia argyrocoma

Ivesia webberi

silver-hair ivesia, silverhair mousetail

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

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

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

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

glomerules 1.
Pedicels

(0.5–)1–8(–13) mm.
Flowers

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

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

Ivesia argyrocoma

Ivesia webberi
Phenology Flowering late spring–early summer.
Habitat Dry flats and slopes, in sagebrush communities, conifer woodlands
Elevation (1300–)1500–1900 m ((4300–)4900–6200 ft)
Distribution
from FNA
CA; nw Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; NV
[BONAP county map]
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.)

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. 242. FNA vol. 9, p. 236.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Unguiculatae Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia
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. setosa, I. shockleyi, I. tweedyi, I. unguiculata, I. utahensis
Subordinate taxa
I. argyrocoma var. argyrocoma
Synonyms Horkelia argyrocoma, Potentilla argyrocoma Potentilla webberi
Name authority (Rydberg) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 284. (1908) 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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