Ivesia utahensis
Ivesia callida
Utah ivesia, Utah mousetail
Tahquitz ivesia, Tahquitz mousetail
prostrate to ascending, 0.5–1.5(–2) dm.
usually pendent or prostrate to ascending, sometimes nearly erect, 0.2–1.5 dm.
± 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, 1–7 cm; sheathing base sparsely strigose abaxially;
petiole 0.3–3 cm;
lateral leaflets (1–)5–8 per side, slightly overlapping, elliptic to flabellate, 2–6(–7) mm, incised nearly to base into (0–)2–4 oblanceolate to elliptic lobes, apex sometimes ± setose, surfaces loosely long-strigose, sparsely glandular;
terminal leaflets indistinct.
(0–)1, not paired.
(1–)2;
blade reduced.
(5–)10–30-flowered, 1–2.5(–5) cm diam.;
glomerules 1–few.
1–10(–15)-flowered, open, (0.5–)2–5 cm diam.
1–7 mm.
5–15 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.
7–10 mm diam.;
epicalyx bractlets 5, narrowly lanceolate, 1.5–3 mm;
hypanthium patelliform, 0.5–1 × 2–3 mm;
sepals 2–3.5 mm, acute;
petals white, obovate, 2–3.5 mm;
stamens 20, filaments 1.5–3 mm, anthers maroon, subrotund, 0.2–0.3 mm;
carpels 4–8, styles 1.5–1.8 mm.
yellowish green to light tan or gray-brown, 1.7–1.9 mm.
greenish white to light tan, 1.5 mm, smooth to lightly rugose, ± carunculate.
Ivesia utahensis
Ivesia callida
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 callida occurs in the Tahquitz Peak area of the San Jacinto Wilderness Area, San Jacinto Mountains, Riverside County, where two populations are known (K. Berg 1983). Plants form tight mats in horizontal crevices and loose pendent clumps on vertical rock faces.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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