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Kingston Mountain mousetail, Kingston Mountains. ivesia

grimy ivesia, grimy mousetail

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

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

± prostrate, (0.1–)0.2–1.5(–2) 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.

tightly cylindric, 2–10 cm; sheathing base densely hairy abaxially;

petiole 0.5–4(–10) cm;

lateral leaflets 4–10(–15) per side, overlapping at least distally, ± flabellate, 0.5–3(–4) mm, incised to base or nearly so into (0–)2–4(–9) elliptic to obovate or orbiculate lobes, apex usually not setose, surfaces densely hirsute, cryptically glandular;

terminal leaflets indistinct.

Cauline leaves

(0–)2;

blade well developed.

(0–)1;

blade vestigial.

Inflorescences

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

5–60(–100)-flowered, congested, 0.5–5(–7) cm diam.

Pedicels

5–20(–30) mm.

1.5–4(–8) 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.

4–8 mm diam.;

epicalyx bractlets 5, linear to elliptic or narrowly ovate, 0.8–1.6(–2.1) mm;

hypanthium patelliform to shallowly cupulate, 1–1.5 × (1.5–)2–3(–3.5) mm;

sepals 1.4–2.5(–2.8) mm, acute;

petals white to pale yellowish, linear to narrowly oblanceolate, 1–1.5 mm;

stamens 5, filaments 0.6–1.8 mm, anthers maroon or yellow with maroon margins, oblong, 0.3–0.6 mm;

carpels 1–2(–4), styles 1–1.5 mm.

Achenes

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

brown, 1.2–1.6(–2) mm, smooth, prominently carunculate.

Ivesia patellifera

Ivesia rhypara

Phenology Flowering summer.
Habitat Dry, rocky outcrops of limestone, usually crevices of more or less vertical protected cliffs or boulders, in conifer woodlands
Elevation 1400–2200 m (4600–7200 ft)
Distribution
from FNA
CA
[BONAP county map]
from FNA
NV; OR
[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.)

Varieties 2 (2 in the flora).

Ivesia rhypara forms densely hairy mats or mounds on isolated edaphic sites in the northern Great Basin. Only one of the widely disjunct population clusters is recognized as a distinct variety; the others have general differences in gestalt, but no significant distinctions have been determined (B. Ertter 1989). Isozyme analysis likewise does not show significant differences (T. Kaye et al., unpubl., BLM and Oregon Dept. of Agriculture, 1991). Reproductive studies by D. Wiens (pers. comm.) show low seed set (ca. 5% in var. rhypara, somewhat higher in var. shellyi), possibly indicating a deleterious genetic load.

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

Key
1. Plants (4–)8–30 cm diam.; inflorescences (1–)2–5(–7) cm diam.; scarcely or cryptically petrophytic in bedrock overlain by rubble and soil.
var. rhypara
1. Plants 2–10(–15) cm diam.; inflorescences 0.5–2(–5) cm diam.; overtly petrophytic in boulders and outcrops.
var. shellyi
Source FNA vol. 9, p. 224. FNA vol. 9, p. 228.
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. sabulosa, I. santolinoides, I. saxosa, I. sericoleuca, I. setosa, I. shockleyi, I. tweedyi, I. unguiculata, I. utahensis, I. webberi
Subordinate taxa
I. rhypara var. rhypara, I. rhypara var. shellyi
Synonyms Potentilla patellifera
Name authority (J. T. Howell) Ertter: Syst. Bot. 14: 232. (1989) Ertter & Reveal: Madroño 24: 224, fig. 1. (1977)
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