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Kingston Mountain mousetail, Kingston Mountains. ivesia

rock ivesia, rock mousetail

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

pendent or prostrate to ascending, (0.5–)1–2 dm.

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

Basal leaves

planar, (2–)5–15 cm; sheathing base not strigose abaxially;

petiole 1–5 cm;

lateral leaflets (1–)2–3(–4) per side, separate, obovate to orbiculate, 5–20 mm, incised 1/4–1/2 to base into 5–9 broadly ovate teeth, apex not setose, surfaces short-pilose, ± glandular;

terminal leaflets distinct.

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

(0–)2;

blade well developed.

1–2(–4);

blade well developed.

Inflorescences

(1–)3–20(–35)-flowered, open, (0.5–)1.5–4(–6) cm diam.

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

Pedicels

5–20(–30) mm.

(5–)10–30 mm.

Flowers

7–10 cm diam.;

epicalyx bractlets 0;

hypanthium patelliform, 0.5(–1) × 2–3 mm;

sepals 2–4 mm, broadly acute;

petals yellow, narrowly oblanceolate, 2–3 mm;

stamens 5–10, filaments 0.6–1.2(–1.5) mm, anthers yellow, oblong, 0.8–1 mm;

carpels 4–10, 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

greenish white to light tan, 1.5–2 mm, faintly rugose, ± carunculate.

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

Ivesia patellifera

Ivesia saxosa

Phenology Flowering summer. Flowering late spring–summer.
Habitat Dry, rocky outcrops of limestone, usually crevices of more or less vertical protected cliffs or boulders, 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 1400–2200 m (4600–7200 ft) 900–3300 m (3000–10800 ft)
Distribution
from FNA
CA
[BONAP county map]
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Ivesia patellifera is confined to crevices in steep wash and canyon walls in the Kingston Mountains of San Bernardino County.

(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. 224. 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. jaegeri, I. kingii, I. longibracteata, I. lycopodioides, I. muirii, I. multifoliolata, I. paniculata, 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 patellifera Potentilla saxosa, P. acuminata, P. saxosa subsp. sierrae
Name authority (J. T. Howell) Ertter: Syst. Bot. 14: 232. (1989) (Lemmon ex Greene) Ertter: Syst. Bot. 14: 232. (1989)
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