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rock ivesia, rock mousetail

Habit Plants green, ± tufted, often forming hanging clumps, sometimes rosetted.
Stems

pendent or prostrate to ascending, 0.4–2.6(–3) dm.

Basal leaves

planar, 2–15 cm; sheathing base not strigose abaxially;

petiole 3–9 cm;

lateral leaflets (1–)2–4(–7) per side, separate to slightly overlapping, obovate to orbiculate or flabellate, (3–)5–15(–22) mm, incised 1/4–3/4 to base into 5–15 broadly ovate teeth or oblanceolate lobes, sometimes also medially split to base (Kern Plateau), apex not setose, surfaces ± sparsely short-pilose, prominently glandular;

terminal leaflets ± distinct.

Cauline leaves

1–2(–4);

blade well developed.

Inflorescences

(1–)3–30(–60)-flowered, open, (0.5–)2–8 cm diam.

Pedicels

(5–)10–30 mm.

Flowers

6–12 mm diam.;

epicalyx bractlets 5, broadly lanceolate to oblong, 1–2.5 mm;

hypanthium patelliform, 0.5–1.5 × 2–4(–4.5) mm;

sepals 2–4.5 mm, acute;

petals yellow, oblanceolate to obovate, (1.5–)2–4 mm;

stamens 15–35(–40), filaments 0.3–1 mm, anthers yellow, subrotund, 0.2–0.3(–0.5) mm;

carpels (3–)10–20(–40), styles 1–2 mm.

Achenes

greenish white to light tan, 1–1.8 mm, faintly rugose, ± carunculate.

Ivesia saxosa

Phenology Flowering late spring–summer.
Habitat Dry, rocky outcrops of granitic or volcanic origin, usually crevices of more or less vertical protected cliffs or boulders, mainly in oak and conifer woodlands
Elevation 900–3300 m (3000–10800 ft)
Distribution
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
Discussion

Ivesia saxosa is encountered in the foothills and mountains of southeastern California from the White Mountains and adjacent eastern slopes of the Sierra Nevada of Mono County to the Transverse Ranges (including the Little San Bernardino Mountains) of Kern and San Bernardino counties. Populations on the Kern Plateau tend to have more dissected leaflets and may deserve recognition as a distinct variety. On the Peninsular Ranges, I. saxosa occurs in Riverside and San Diego counties and into northern Baja California, Mexico, as far south as the western slopes of the Sierra Juárez and Sierra San Pedro Mártir.

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

Source FNA vol. 9, p. 223.
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. sericoleuca, I. setosa, I. shockleyi, I. tweedyi, I. unguiculata, I. utahensis, I. webberi
Synonyms Potentilla saxosa, P. acuminata, P. saxosa subsp. sierrae
Name authority (Lemmon ex Greene) Ertter: Syst. Bot. 14: 232. (1989)
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