Ivesia muirii
Ivesia campestris
granite mousetail, Muir's ivesia
field ivesia, field mousetail, Kaweah ivesia
usually ± erect, sometimes nearly prostrate, 0.5–1.5(–2) dm.
decumbent to ascending, 1–3.5 dm.
very tightly cylindric (mousetail-like, with individual leaflets scarcely distinguishable), 2–5(–10) cm; sheathing base densely strigose abaxially;
petiole 0.2–0.8(–1) cm, hairs 0.5–1.5 mm;
leaflets 25–40 per side, 0.4–1 mm, densely sericeous, glands obscured, lobes 2–5, obovate or oval to orbiculate, apex not setose.
(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.
(0–)1–2, paired if 2.
3–4.
10–30-flowered, 1–2(–3.5) cm diam.;
glomerules usually 1.
5–20(–40)-flowered, (1–)1.5–2.5(–4) cm diam., flowers arranged in 1–few ± tight glomerules of 10–15 flowers.
0.3–2(–3.5) mm.
1–4 mm.
5–6 mm diam.;
epicalyx bractlets oblong to obovate, 0.5–1 mm;
hypanthium shallowly cupulate, 0.5–1(–1.5) × 1.5–2.5 mm;
sepals (1–)1.5–2.5 mm, acute;
petals yellow, linear to oblanceolate or narrowly oblong, 1–2 mm;
stamens 5, filaments 0.3–0.6 mm, anthers yellow, 0.4–0.6 mm;
carpels 1–4, styles 0.7–1.2 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.
grayish brown, mottled with red, 1.6–2 mm.
light brown, 1–1.5 mm.
Ivesia muirii
Ivesia campestris
Ivesia muirii is known from alpine areas in the Sierra Nevada. It is one of the more distinctive species of the genus, in its silvery mousetail-like leaves and usually tightly capitate inflorescences. Putative hybrids are known with I. lycopodioides (D. D. Keck 1938) and I. pygmaea (Center Basin area of Tulare County).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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