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Utah ivesia, Utah mousetail

Ivesia longibracteata

Castle Crags ivesia, longbract mousetail

Habit Plants green, rosetted to tufted; taproot proximally enlarged, not fleshy. Plants green, ± tufted; taproot ± stout, not fleshy.
Stems

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

ascending to erect, 0.3–1.2 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.

weakly planar to loosely ± cylindric, (0.5–)2–4(–6) cm; sheathing base glandular abaxially, otherwise glabrous;

petiole 0.5–2 cm, hairs 0.2–1 mm;

leaflets 5–6 per side, 2–6 mm, ± short-hirsute, glandular-puberulent, lobes 2–7, oblanceolate to spatulate or obovate, apex not setose.

Cauline leaves

(0–)1, not paired.

1–3, not paired.

Inflorescences

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

glomerules 1–few.

3–14-flowered, 1–2.5 cm diam.;

glomerules 1.

Pedicels

1–7 mm.

1.5–6 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.

8–10 mm diam.;

epicalyx bractlets linear to narrowly lanceolate or elliptic, 2.5–5 mm, longer than sepals;

hypanthium shallowly cupulate, 0.5–1 × 2–3 mm;

sepals 1.5–2.5 mm, ± acute;

petals pale yellow, linear to narrowly oblanceolate, 1.5–2.5 mm;

stamens 5, filaments 0.7–1.3 mm, anthers yellow, 0.5–0.8 mm;

carpels 6–11, styles 1–1.5 mm.

Achenes

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

cream to light tan, 1.2–1.5 mm.

Ivesia utahensis

Ivesia longibracteata

Phenology Flowering summer. Flowering summer.
Habitat Talus slopes, bare ridges, in high-elevation sagebrush communities, subalpine to alpine conifer woodlands Dry crevices of granodioritic igneous rock, in mixed oak-conifer woodlands
Elevation 3200–3700 m (10500–12100 ft) 1200–1400 m (3900–4600 ft)
Distribution
from FNA
UT
[BONAP county map]
from FNA
CA
[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 longibracteata is known only from the Castle Crags area of Shasta County. The epithet alludes to a diagnostic characteristic unique in the genus: the epicalyx bractlets are longer than the sepals. The plants grow on vertical rock faces, a habitat more characteristic of sect. Setosae; however, the stems are ascending to erect and do not form hanging clumps, and the pedicels are not curved in fruit.

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

Source FNA vol. 9, p. 233. FNA vol. 9, p. 236.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia
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. jaegeri, I. kingii, 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
Name authority S. Watson: Proc. Amer. Acad. Arts 17: 371. (1882) Ertter: Syst. Bot. 14: 233, fig. 1. (1989)
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