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Jaeger's ivesia, Jaeger's mousetail

rock ivesia, rock mousetail

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

pendent or prostrate to ascending, 0.3–1.5 dm.

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

Basal leaves

± loosely cylindric to weakly planar, 2–8(–10) cm; sheathing base not or sparsely strigose abaxially;

petiole 0.5–4 cm;

lateral leaflets (1–)4–6(–8) per side, ± overlapping at least distally, ± flabellate, 2–6(–7) mm, incised nearly to base into 3–6 oblanceolate to narrowly obovate lobes, apex not or scarcely setose, surfaces ± sparsely short-pilose, ± glandular;

terminal leaflets indistinct.

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;

blade well developed.

1–2(–4);

blade well developed.

Inflorescences

(1–)3–15-flowered, open, (0.5–)1.5–4(–7) cm diam.

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

Pedicels

5–30 mm.

(5–)10–30 mm.

Flowers

5–11 mm diam.;

epicalyx bractlets 5, lanceolate, 1–2 mm;

hypanthium patelliform, 1 × 2–4 mm;

sepals 2–3 mm, ± acute;

petals yellow, narrowly oblanceolate, 1.5–2 mm;

stamens 20, filaments 1–1.5(–1.8) mm, anthers yellow, subrotund, 0.2–0.3 mm;

carpels 3–8, styles 1.5–2 mm.

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

tan to light brown, 1–2 mm, ± rugose, ± carunculate.

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

Ivesia jaegeri

Ivesia saxosa

Phenology Flowering summer. Flowering late spring–summer.
Habitat Dry, rocky outcrops of limestone origin, usually crevices of more or less vertical protected cliffs or boulders, mainly in conifer woodlands 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 1600–3600 m (5200–11800 ft) 900–3300 m (3000–10800 ft)
Distribution
from FNA
CA; NV
[BONAP county map]
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Ivesia jaegeri is known only from the Spring Mountains, Clark County, Nevada, and the Clark Mountains, San Bernardino County, California.

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

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. FNA vol. 9, p. 223.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae 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. 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. sericoleuca, I. setosa, I. shockleyi, I. tweedyi, I. unguiculata, I. utahensis, I. webberi
Synonyms Potentilla jaegeri Potentilla saxosa, P. acuminata, P. saxosa subsp. sierrae
Name authority Munz & I. M. Johnston: Bull. Torrey Bot. Club 56: 165. (1929) (Lemmon ex Greene) Ertter: Syst. Bot. 14: 232. (1989)
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