Ivesia paniculata
Ivesia campestris
Ash Creek ivesia, Ash Creek mousetail
field ivesia, field mousetail, Kaweah ivesia
± prostrate, 0.4–1.5(–2) dm.
decumbent to ascending, 1–3.5 dm.
tightly cylindric, (1.5–)2–5(–7) cm; sheathing base densely hairy abaxially;
petiole 0.5–4 cm;
lateral leaflets (5–)8–15 per side, overlapping at least distally, ± flabellate, 0.5–2 mm, incised to base or nearly so into (0–)3–8(–15) elliptic to narrowly obovate lobes, apex not or obscurely setose, surfaces densely hirsute, cryptically glandular;
terminal leaflets indistinct.
(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;
blade reduced.
3–4.
20–200-flowered, congested, (1–)1.5–6(–10) cm diam.
5–20(–40)-flowered, (1–)1.5–2.5(–4) cm diam., flowers arranged in 1–few ± tight glomerules of 10–15 flowers.
1.5–6 mm.
1–4 mm.
4–6 mm diam.;
epicalyx bractlets 5, lanceolate to elliptic, 0.6–1.5(–2) mm;
hypanthium shallowly cupulate, 1 × 2–3 mm;
sepals (1–)1.5–2.5(–3) mm, acute;
petals white to pale yellowish, linear, 1 mm;
stamens 5, filaments 0.3–1 mm, anthers yellow with maroon margins, ovate, 0.3–0.5 mm;
carpels 1–2(–3), styles 0.7–1.8 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.
brown, 0.8–1.5 mm, smooth, prominently carunculate.
light brown, 1–1.5 mm.
Ivesia paniculata
Ivesia campestris
Of conservation concern.
Ivesia paniculata is known only from the Ash Valley area of Lassen County. The distinctions between I. paniculata and I. rhypara are perhaps on the same scale as variation among disjunct population clusters of I. rhypara, but no taxonomic adjustments are proposed at this time.
(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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