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Utah ivesia, Utah mousetail

Jaeger's ivesia, Jaeger's mousetail

Habit Plants green, rosetted to tufted; taproot proximally enlarged, not fleshy. Plants green, ± tufted to ± matted, often forming hanging clumps, sometimes rosetted.
Stems

prostrate to ascending, 0.5–1.5(–2) dm.

pendent or prostrate to ascending, 0.3–1.5 dm.

Basal leaves

± tightly cylindric, 2–7(–9) cm; sheathing base glabrous abaxially;

petiole 0.5–2 cm, hairs 0.5–1 mm;

leaflets 15–20 per side, 2–4 mm, glabrate or sparsely short-hirsute, sparsely to densely glandular, lobes (2–)3–8, narrowly oblanceolate to obovate, apex not setose.

± 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.

Cauline leaves

(0–)1, not paired.

(1–)2;

blade well developed.

Inflorescences

(5–)10–30-flowered, 1–2.5(–5) cm diam.;

glomerules 1–few.

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

Pedicels

1–7 mm.

5–30 mm.

Flowers

7–9 mm diam.;

epicalyx bractlets narrowly oblong to oval, 0.8–2 mm;

hypanthium shallowly cupulate, (1–)1.5–2 × 2.5–3.5 mm;

sepals (1.8–)2–3 mm, acute;

petals white, sometimes pink-tinged, oblanceolate to spatulate, 1.8–3 mm;

stamens 5, filaments 1.3–1.8 mm, anthers orangish to reddish brown, 0.4–0.6 mm;

carpels (1–)2–4, styles 1.5–2 mm.

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.

Achenes

yellowish green to light tan or gray-brown, 1.7–1.9 mm.

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

Ivesia utahensis

Ivesia jaegeri

Phenology Flowering summer. Flowering summer.
Habitat Talus slopes, bare ridges, in high-elevation sagebrush communities, subalpine to alpine conifer woodlands Dry, rocky outcrops of limestone origin, usually crevices of more or less vertical protected cliffs or boulders, mainly in conifer woodlands
Elevation 3200–3700 m (10500–12100 ft) 1600–3600 m (5200–11800 ft)
Distribution
from FNA
UT
[BONAP county map]
from FNA
CA; NV
[BONAP county map]
Discussion

Of conservation concern.

Ivesia utahensis is known from the Wasatch and adjacent Uinta Mountains in northern Utah. The species stands as the white-petaled counterpart to the yellow-petaled Sierran I. lycopodioides, possibly indicating a common ancestral stock that was once more continuous across the Great Basin.

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

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.)

Source FNA vol. 9, p. 233. FNA vol. 9, p. 223.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia 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. saxosa, I. sericoleuca, I. setosa, I. shockleyi, I. tweedyi, I. unguiculata, I. webberi
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
Synonyms Potentilla utahensis Potentilla jaegeri
Name authority S. Watson: Proc. Amer. Acad. Arts 17: 371. (1882) Munz & I. M. Johnston: Bull. Torrey Bot. Club 56: 165. (1929)
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