Ivesia utahensis
Ivesia webberi
Utah ivesia, Utah mousetail
Webber's ivesia, wire ivesia, wire mousetail
prostrate to ascending, 0.5–1.5(–2) dm.
decumbent to ascending, 0.5–1.5(–1.8) 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, 3–7(–10) cm; sheathing base ± strigose abaxially;
petiole 0.5–5(–6) cm, hairs 2–4 mm;
leaflets 4–8(–10) per side, (0.5–)3–8(–10) mm, loosely long-strigose or -villous and short-hirsute, ± glandular, lobes 2–5(–12), linear to lanceolate, apex not setose.
(0–)1, not paired.
2, paired.
(5–)10–30-flowered, 1–2.5(–5) cm diam.;
glomerules 1–few.
5–15(–25)-flowered, 1.5–3(–6) cm diam.;
glomerules 1.
1–7 mm.
(0.5–)1–8(–13) 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.
9–12 mm diam.;
epicalyx bractlets linear, 1.2–3 mm;
hypanthium cupulate, 1–2(–2.5) × 2.5–5 mm;
sepals 2.5–4.5(–5.5) mm, acute;
petals yellow, narrowly oblanceolate, 2–3(–4) mm;
stamens 5, filaments 1.8–2.5(–3) mm, anthers yellow, (0.8–)1–1.6 mm;
carpels 3–8, styles 1.8–2.2 mm.
yellowish green to light tan or gray-brown, 1.7–1.9 mm.
light brown, often mottled darker brown, 1.9–2.5 mm.
Ivesia utahensis
Ivesia webberi
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 webberi is known only from the eastern foothills of the northern Sierra Nevada and scattered ranges to the east in California and adjacent Nevada. It is among the more distinctive species in the genus and is only tentatively placed in sect. Ivesia. The leaflets are loosely incised into slender, sparsely villous segments, and the two cauline leaves are paired with dissected stipules. Previous reports of the stems and inflorescence branches being glandular-puberulent are due to a misinterpretation of the minute pustulose bases associated with the villous indumentum as being enlarged glands.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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USDA Plants Database
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