Flora of North America species comparison

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Ivesia shockleyi

Ivesia shockleyi var. shockleyi

Shockley's ivesia, sky mousetail
Photo is of parent taxon

Shockley's ivesia, sky mousetail
Habit Plants green to grayish green, ± densely matted.
Stems

prostrate to ascending, 0.2–1.5 dm.

0.2–0.7(–1.1) dm.
Basal leaves

tightly to loosely cylindric, (1–)2–12(–14) cm; sheathing base strigose to hirsute abaxially;

petiole 0.5–4 cm;

lateral leaflets (3–)5–15(–18) per side, separate to overlapping at least distally, ± flabellate, 1–4(–6) mm, incised to base or nearly so into 2–10(–12) oblanceolate to obovate or elliptic lobes, apex sometimes setose, surfaces ± sparsely hirsute, ± glandular;

terminal leaflets indistinct.

(1–)2–8(–10) cm;

lateral leaflets (3–)5–10 per side, lobes 2–5(–7), oblanceolate to obovate.
Cauline leaves

(0–)1;

blade vestigial or reduced.

0.3–1 cm, blade vestigial, leaflets usually 0.
Inflorescences

2–20-flowered, ± open, 0.5–4(–6) cm diam.

2–10-flowered, 0.5–3 cm diam.
Pedicels

3–10(–12) mm.

Flowers

5–10 mm diam.;

epicalyx bractlets 5, elliptic or narrowly oblong to ovate, 0.7–2(–3) mm;

hypanthium patelliform, 1–2 × 2.5–4.5(–5) mm;

sepals 1.5–3.5(–4) mm, acute to obtuse;

petals ± yellow, oblanceolate to spatulate or narrowly obovate, 1–3 mm;

stamens 5, filaments 0.8–1.8 mm, anthers yellow, oblong, 0.4–0.9 mm;

carpels 2–5(–6), styles 1.8–2.5 mm.

Achenes

greenish cream to light brown, 1.5–2.2(–2.5) mm, smooth, prominently carunculate.

Ivesia shockleyi

Ivesia shockleyi var. shockleyi
Phenology Flowering spring–early summer.
Habitat Gravelly to rocky slopes and ridges, mainly in high-elevation sagebrush communities, subalpine or alpine conifer woodlands, alpine tundra communities
Elevation 1700–4000 m (5600–13100 ft)
Distribution
from FNA
CA; NV; OR; UT
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; NV; OR
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

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

Of conservation concern.

Variety shockleyi occurs mainly on rocky slopes and talus near and above timberline from the crest of the northern and central Sierra Nevada in California and adjacent Nevada, to Lake and Malheur counties, Oregon, and on scattered sky islands as far as the Toquima Range (Nye County) and Jarbidge Mountains (Elko County) of Nevada. These isolated populations have developed variation that merits further analysis: plants from the northern Intermountain Region tend to have flowers and leaflets larger than those in the Sierra Nevada; central Nevada populations approach var. ostleri in leaflet number and inflorescence size. The Malheur County plants are unusual in occurring on canyon rimrock (West Little Owyhee River) 1000 m lower than any other known population, near I. baileyi var. beneolens on adjacent canyon walls.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Lateral leaflets: lobes 2–5(–7); inflorescences 2–10-flowered, 0.5–3 cm diam.; e California, c, se Oregon, c, n Nevada.
var. shockleyi
1. Lateral leaflets: lobes (4–)6–10(–12); inflorescences 5–20-flowered, (1–)3–4(–6) cm diam.; wc Utah.
var. ostleri
Source FNA vol. 9, p. 227. FNA vol. 9, p. 228.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae > Ivesia shockleyi
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. tweedyi, I. unguiculata, I. utahensis, I. webberi
I. shockleyi var. ostleri
Subordinate taxa
I. shockleyi var. ostleri, I. shockleyi var. shockleyi
Synonyms Potentilla shockleyi
Name authority S. Watson: Proc. Amer. Acad. Arts 23: 263. (1888) unknown
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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