Ivesia sabulosa |
Ivesia utahensis |
|
---|---|---|
intermountain ivesia, intermountain mousetail, Sevier ivesia, yellow comarella |
Utah ivesia, Utah mousetail |
|
Habit | Plants ± grayish green. | Plants green, rosetted to tufted; taproot proximally enlarged, not fleshy. |
Stems | ascending to erect, (1.8–)2–6(–6.5) dm. |
prostrate to ascending, 0.5–1.5(–2) dm. |
Basal leaves | 7–25(–30) cm; sheathing base usually sparsely strigose abaxially; petiole 1–4(–5) cm; leaflets 15–40 per side, ± flabellate, 3–14 mm, usually incised to base into 2–3 oblanceolate lobes, ± densely short-hirsute to -villous. |
± 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. |
Cauline leaves | (0–)1, not paired. |
|
Inflorescences | 10–60-flowered, 4–15 cm diam. |
(5–)10–30-flowered, 1–2.5(–5) cm diam.; glomerules 1–few. |
Pedicels | (1–)5–20 mm. |
1–7 mm. |
Flowers | 9–14 mm diam.; epicalyx bractlets lanceolate, 1–3(–3.3) mm; hypanthium interior golden, 1–2 × 3–5 mm; sepals (2.5–)3.5–6 mm, base golden adaxially, apex acute to acuminate; petals yellow, linear to narrowly oblanceolate, 2–4 mm; stamens 5, filaments 2–4 mm, anthers yellow, sometimes red-rimmed, oblong, 0.6–1.2 mm; carpels 1–5, styles 2–3 mm. |
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. |
Achenes | brown, 1.7–2.2 mm. |
yellowish green to light tan or gray-brown, 1.7–1.9 mm. |
Ivesia sabulosa |
Ivesia utahensis |
|
Phenology | Flowering summer. | Flowering summer. |
Habitat | Dry flats and slopes, on gravelly volcanic or limestone soil, in sagebrush and other desert shrub communities, montane conifer woodlands | Talus slopes, bare ridges, in high-elevation sagebrush communities, subalpine to alpine conifer woodlands |
Elevation | 1500–2700 m (4900–8900 ft) | 3200–3700 m (10500–12100 ft) |
Distribution |
AZ; NV; UT
|
UT |
Discussion | Of conservation concern. Ivesia sabulosa occurs from central Nevada and southwestern Utah south to Arizona north of the Grand Canyon. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
Source | FNA vol. 9, p. 244. | FNA vol. 9, p. 233. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Comarella | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia |
Sibling taxa | ||
Synonyms | Potentilla sabulosa, Comarella sabulosa | Potentilla utahensis |
Name authority | (M. E. Jones) D. D. Keck: Lloydia 1: 124. (1939) | S. Watson: Proc. Amer. Acad. Arts 17: 371. (1882) |
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