Ivesia cryptocaulis |
Ivesia utahensis |
|
---|---|---|
Charleston Peak ivesia, Charleston Peak mousetail |
Utah ivesia, Utah mousetail |
|
Habit | Plants green, diffusely matted. | Plants green, rosetted to tufted; taproot proximally enlarged, not fleshy. |
Stems | prostrate to decumbent, 0.2–0.6(–1) dm. |
prostrate to ascending, 0.5–1.5(–2) dm. |
Basal leaves | tightly cylindric, 1–4(–5) cm; sheathing base mostly not strigose abaxially; petiole 0.3–2 cm, hairs 0.5–1 mm; lateral leaflets 5–10(–12) per side, ± overlapping, ± flabellate, 1–2.5 mm, incised to base or nearly so into 3–5 obovate to oval lobes, apex sometimes ± setose, surfaces loosely long-strigose, sparsely glandular; terminal leaflets indistinct. |
± 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 | 1(–2); blade vestigial. |
(0–)1, not paired. |
Inflorescences | 1–10-flowered, ± congested, 0.5–1.5 cm diam. |
(5–)10–30-flowered, 1–2.5(–5) cm diam.; glomerules 1–few. |
Pedicels | 3–7(–10) mm. |
1–7 mm. |
Flowers | 6–9 mm diam.; epicalyx bractlets 5, lanceolate to narrowly oblong or narrowly ovate, 0.8–1.3 mm; hypanthium shallowly cupulate, ± 1 × 2–3(–4) mm; sepals 1.5–2.3 mm, ± acute; petals yellow, oblanceolate to spatulate, 2–3.2 mm; stamens 5, filaments 0.9–1.2 mm, anthers yellow, oblong, 0.7–0.9 mm; carpels 6–10, styles 1–1.5 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 | greenish cream to light brown, 1.4–1.8(–2) mm, smooth, not carunculate. |
yellowish green to light tan or gray-brown, 1.7–1.9 mm. |
Ivesia cryptocaulis |
Ivesia utahensis |
|
Phenology | Flowering summer. | Flowering summer. |
Habitat | Dry to moist limestone gravel, scree, or talus slopes and outcrops, subalpine conifer woodlands, alpine tundra communities | Talus slopes, bare ridges, in high-elevation sagebrush communities, subalpine to alpine conifer woodlands |
Elevation | 2500–3700 m (8200–12100 ft) | 3200–3700 m (10500–12100 ft) |
Distribution |
NV |
UT |
Discussion | Of conservation concern. Ivesia cryptocaulis is known only from timberline and above in the Spring Mountains of Clark County. Plants differ from all others of the genus by having slender, elongate, diffuse caudex branches that ramify through its habitat of gravel, scree, and talus. The species is here provisionally included in sect. Setosae as a diffusely matted relative of I. shockleyi (as also suggested by D. D. Keck 1938); the ecarunculate seeds and relatively straight pedicels may indicate a greater similarity to I. pygmaea in sect. Ivesia. (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. 228. | FNA vol. 9, p. 233. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Potentilla cryptocaulis | Potentilla utahensis |
Name authority | (Clokey) D. D. Keck: Lloydia 1: 130. (1939) | S. Watson: Proc. Amer. Acad. Arts 17: 371. (1882) |
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