Ivesia campestris
Ivesia callida
field ivesia, field mousetail, Kaweah ivesia
Tahquitz ivesia, Tahquitz mousetail
decumbent to ascending, 1–3.5 dm.
usually pendent or prostrate to ascending, sometimes nearly erect, 0.2–1.5 dm.
(3–)5–15(–18) cm; sheathing base glabrous or sparsely strigose abaxially;
stipules ± lanceolate, 2.5–5 mm;
petiole (0.3–)0.5–6(–8) cm, hairs sparse to abundant, appressed-ascending, 1–2 mm;
leaflets 15–20 per side, loosely overlapping, 2–10 mm, lobes 2–5, oblanceolate, hairs sparse to abundant, spreading to ascending, 1–2 mm.
± 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.
3–4.
(1–)2;
blade reduced.
5–20(–40)-flowered, (1–)1.5–2.5(–4) cm diam., flowers arranged in 1–few ± tight glomerules of 10–15 flowers.
1–10(–15)-flowered, open, (0.5–)2–5 cm diam.
1–4 mm.
5–15 mm.
7–10 mm diam.;
epicalyx bractlets linear to oblong, 1–2(–2.5) mm;
hypanthium campanulate, 1–2 × 2.5–4 mm, ± 1/2 as deep as wide;
sepals green, 2–3(–3.5) mm, acute;
petals 4(–5), light yellow, oblanceolate to spatulate or narrowly obovate, 3–4 mm;
stamens 12–16 (4-merous flowers) or 16–20 (5-merous flowers), filaments filiform, 0.6–1.1 mm, anthers yellowish, 0.3–0.5 mm;
carpels 4–20, styles 1.4–2 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.
light brown, 1–1.5 mm.
greenish white to light tan, 1.5 mm, smooth to lightly rugose, ± carunculate.
Ivesia campestris
Ivesia callida
Ivesia campestris is found in the southern Sierra Nevada south of the Kings River, where it replaces I. unguiculata and often occurs at higher elevations.
Ivesia campestris is the only member of the genus that commonly has 4-merous flowers. It is sometimes misidentified as I. unguiculata, especially when the pale yellow petals have faded to creamy white; the glomerules of the inflorescences tend to be yellowish green to green rather than purplish. Also, the anthers of I. campestris are yellowish, rather than maroon.
(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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