Ivesia pityocharis
Ivesia campestris
pine nut mountain mousetail, pine nut mountains ivesia
field ivesia, field mousetail, Kaweah ivesia
prostrate-decumbent to ascending, 0.5–2(–3) dm.
decumbent to ascending, 1–3.5 dm.
6–12(–15) cm; sheathing base weakly strigose abaxially;
stipules absent;
petiole (1–)1.5–2.5(–3) cm, hairs abundant, ascending to spreading, 1–4 mm;
leaflets 15–25 per side, loosely overlapping, (1.5–)2–7 mm, lobes 0–4(–6), lanceolate or oblanceolate to elliptic, hairs abundant, spreading to ascending, 1–3 mm.
(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.
2–5.
3–4.
(7–)15–50-flowered, 2–8 cm diam., flowers arranged individually and/or in several to many loose few-flowered glomerules.
5–20(–40)-flowered, (1–)1.5–2.5(–4) cm diam., flowers arranged in 1–few ± tight glomerules of 10–15 flowers.
(3–)6–15(–22) mm.
1–4 mm.
8–13 mm diam.;
epicalyx bractlets lanceolate to elliptic, 2–3 mm;
hypanthium patelliform to shallowly cupulate, 1.5–2.5 × 3–4.5 mm, ± 1/2 as deep as wide;
sepals often purple-suffused, 2.3–4(–5) mm, acute;
petals white, broadly spatulate or obovate to orbiculate, (2.8–)3–5(–6) mm;
stamens 20, filaments filiform, (1–)1.5–3 mm, anthers light pink, 0.3–0.5 mm;
carpels 8–20, styles 2.2–3 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.
light brown, 1.2–1.3 mm.
light brown, 1–1.5 mm.
Ivesia pityocharis
Ivesia campestris
Of conservation concern.
Ivesia pityocharis is known only from the Pine Nut Mountains, Douglas County. Plants are somewhat intermediate between those of I. kingii and I. sericoleuca in having relatively shallow hypanthia and loosely sericeous vestiture. Hairs on petioles and stem bases of I. pityocharis are to 4 mm; those of I. kingii are 1 mm and generally appressed-ascending.
(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.)
CalFlora
WildflowerSearch
iNaturalist
USDA Plants Database
