Lepidium alyssoides
Lepidium ostleri
mesa pepperwort
Ostler's pepperweed
few to several from base, erect to ascending, branched throughout, (0.7–)1–4.8(–6.1) dm.
simple from base (caudex branch), erect to ascending, unbranched distally, (0.1–)0.3–0.8 dm.
often not rosulate;
petiole 1–6 cm;
blade pinnately lobed, (1–)1.5–8(–11) cm × (5–)10–35 mm, margins (of lobes) entire or denticulate.
not rosulate;
petiole often undifferentiated, (expanded base to 2 mm);
blade (somewhat fleshy), linear to linear-oblanceolate (when margins entire), or spatulate in outline (when apically 3–5-lobed, lobes obovate to oblong), 3–12(–15) cm × 5–15 mm, margins entire.
sessile;
blade linear, (0.8–)1.3–7(–9.5) cm × (0.7–)1–2(–3) mm, base attenuate, not auriculate, margins entire.
sessile;
similar to basal, smaller, base not auriculate.
elongated in fruit;
rachis puberulent or glabrous.
slightly elongated in fruit;
rachis puberulent, trichomes straight or curved, cylindrical.
sepals ovate to oblong, 1–2 × 0.8–1 mm;
petals white, suborbicular, 2–3 × 1–2 mm, claw 0.5–1.5 mm;
stamens 6;
filaments 1.5–2 mm, (glabrous);
anthers 0.2–0.4 mm.
sepals orbicular to broadly obovate, 1.5–2(–2.5) × 1–1.5(–2) mm;
petals white to pale purple, suborbicular to obovate, 2–3.5 × 1.5–2.5(–2.8) mm, claw to 0.5 mm;
stamens 6;
filaments 1.5–1.8 mm, (glabrous);
anthers 0.3–0.5 mm.
divaricate to horizontal, straight or recurved to somewhat sigmoid, (terete), 3.5–8(–11) × 0.2 mm, glabrous or puberulent adaxially.
divaricate-ascending to subhorizontal, straight or slightly curved, (not winged), (2.5–)3–5(–6.5) × 04–0.5 mm, densely puberulent throughout.
broadly ovate, 2–3.7(–4.3) × (1.5–)1.8–2.9(–3.4) mm, apically winged, apical notch 0.1–0.3(–0.4) mm deep;
valves thin, smooth, not veined, glabrous;
style 0.2–0.6 mm, exserted beyond apical notch.
ovate, 2.5–3.5(–4) × 2–2.5(–3) mm, apically winged, apical notch 0.05–0.2 mm deep;
valves thin, smooth, not veined, glabrous;
style 0.3–0.6 mm, exserted beyond apical notch.
ovate, 1.5–1.8(–2) × 0.9–1.2(–1.5) mm.
ovate, 1.2–1.5 × 0.9–1.1 mm.
= 32.
Lepidium alyssoides
Lepidium ostleri
Of the five varieties of Lepidium alyssoides recognized by R. C. Rollins (1993), one (var. mexicanum Rollins) is a short-tufted form of the species restricted to Mexico that does not seem to merit recognition, another (var. junceum) is a glabrescent form of the type variety, a third (var. eastwoodiae) is treated below as a distinct species, and the fourth (var. angustifolium) is included here within L. alyssoides.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Lepidium ostleri is known only from the San Francisco Mountains in Beaver County.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CalFlora
WildflowerSearch
iNaturalist
USDA Plants Database
