Lepidium pinnatifidum |
Lepidium eastwoodiae |
|
---|---|---|
feather-leaf pepper-weed, wayside pepper grass |
mesa pepperwort |
|
Habit | Annuals; puberulent. | Annuals, biennials, or perennials; (base woody); glabrous or pubescent. |
Stems | simple from base, erect, (paniculately) branched beyond base or distally, 2–6 dm. |
simple from base, erect, branched distally, (3.5–)4.5–16(–18) dm. |
Basal leaves | (soon withered, often before anthesis); not rosulate; blade dentate to pinnatifid. |
(soon deciduous), not rosulate; petiole (1–)2–5.5(–7.5) cm; blade pinnatifid, (2–)3–6.8(–9) cm × 10–30 mm, margins (of lobes) dentate to serrate. |
Cauline leaves | shortly petiolate to subsessile; blade narrowly oblanceolate to linear, 1–3.3 cm × 1–4 mm, base attenuate, not auriculate, margins entire. |
shortly petiolate or sessile; blade narrowly lanceolate or oblanceolate to linear, 3–7 cm × (2.5–)4–10mm (smaller distally), base attenuate to cuneate, not auriculate, margins usually entire, rarely dentate. |
Racemes | (often paniculate), considerably elongated in fruit; rachis glabrous or puberulent, trichomes straight, cylindrical. |
elongated in fruit; rachis puberulent, trichomes straight or curved. |
Flowers | sepals oblong, 0.7–0.8 × 0.3–0.4 mm; petals (rudimentary), white, linear, 0.4–0.6 × 0.05–0.1 mm, claw absent; stamens 4, median and lateral; filaments 0.6–0.8 mm; anthers ca. 0.2 mm. |
sepals suborbicular to oblong, 0.8–1.5 × 0.7–1.2 mm; petals white, suborbicular, 2.2–3.5(4) × 1.5–2.5 mm, claw 0.7–1.5 mm; stamens 6; filaments 1.5–2.5 mm, (glabrous); anthers 0.3–0.4 mm. |
Fruiting pedicels | divaricate-ascending to horizontal, straight, (terete), 2–3.5 × 0.1–0.15 mm, puberulent adaxially. |
divaricate-ascending to horizontal, usually slightly recurved or somewhat sigmoid, rarely straight, (not winged), (3–)3.5–7.5(–8) × 0.2–0.3 mm, puberulent adaxially. |
Fruits | orbicular to broadly elliptic, 1.8–2 × 1.7–1.8 mm, apically not winged, apical notch 0.05–0.1 mm deep; valves thin, smooth, not veined, sparsely pilose; style ca. 0.1 mm, equaling apical notch. |
broadly ovate, 2–3.5(–4) × 1.8–2.6(–3) mm, apically winged, apical notch 0.1–0.2mm deep; valves thin, smooth, not veined, glabrous; style (0.2–)0.3–0.6(–0.7) mm, exserted beyond apical notch. |
Seeds | oblong, 1–1.2 × 0.7–0.8 mm. |
(dark brown), ovate, 1.4–1.8 × 0.8–1.1 mm. |
Lepidium pinnatifidum |
Lepidium eastwoodiae |
|
Phenology | Flowering May–Jun. | Flowering Jul–Sep. |
Habitat | Waste places, disturbed sites | Pinyon-juniper, sagebrush, or mixed desert shrub communities |
Elevation | 0-600 m (0-2000 ft) | 900-2200 m (3000-7200 ft) |
Distribution |
e Europe; w Asia [Introduced, Calif.]
|
AZ; CO; NM; UT
|
Discussion | Lepidium pinnatifidum apparently has not become a serious weed of the Californian flora. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
C. L. Hitchcock (1936) and R. C. Rollins (1993) reduced Lepidium eastwoodiae to a variety of L. montanum and L. alyssoides, respectively. However, the differences in morphology and flowering periods support its recognition as an independent species. We have not examined the holotype of Lepidium moabense and follow N. H. Holmgren (2005b) in reducing it to synonymy of L. eastwoodiae. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 591. | FNA vol. 7, p. 581. |
Parent taxa | Brassicaceae > tribe Lepidieae > Lepidium | Brassicaceae > tribe Lepidieae > Lepidium |
Sibling taxa | ||
Synonyms | L. alyssoides var. eastwoodiae, L. moabense, L. montanum var. eastwoodiae | |
Name authority | Ledebour: Fl. Ross. 1: 206. (1841) | Wooton: Bull. Torrey Bot. Club 25: 258. (1898) |
Web links |