Hirschfeldia incana

(Linnaeus) Lagrèze-Fossat

Fl. Tarn Garonne, 19. 1847.

Common names: Mediterranean mustard summer- or hoary-mustard
Basionym: Sinapis incana Linnaeus Cent. Pl. I, 19. 1755
Synonyms: Brassica adpressa (Moench) Boissier Brassica geniculata (Desfontaines) Ball Hirschfeldia adpressa Moench Sinapis geniculata Desfontaines
Treatment appears in FNA Volume 7. Treatment on page 437.

Stems (2–)4–15(–20) dm, densely pubescent proximally, trichomes retrorse. Basal leaves: petiole 1–4(–10) cm; blade (3–)4–22(–35) cm × 15–60(–80) mm, lobes 1–6(–9) each side, ovate or lanceolate, (smaller than terminal), terminal lobe broadly ovate, surfaces densely pubescent. Cauline leaves (distal) ± sessile; blade oblong to lanceolate, similar to basal, (smaller distally). Fruiting pedicels (appressed to rachis, almost as thick as fruit), 2–4(–5) mm. Flowers: sepals 3–5 × 1.2–2 mm; petals 5–10 × 2.5–4.5 mm; filaments 3–5 mm;anthers 1–1.5 mm. Fruits 0.7–1.5(–1.7) cm × 1–1.7 mm; valves 6–10 mm; terminal segment 3–6 mm. Seeds 0.9–1.5 mm diam. 2n = 14.

Phenology: Flowering Apr–Nov.
Habitat: Roadsides, waste places, disturbed areas, canyons, creek bottoms, dry fields, open desert
Elevation: 100-1600 m


V7 658-distribution-map.gif

Introduced; Calif., Nev., Oreg., Eurasia, nw Africa, introduced also in South America, s Africa, Atlantic Islands, Pacific Islands (Hawaii), Australia.


Hirschfeldia incana was first collected in North America in 1895 in the San Bernardino region, and by 1936 it was described as “already a serious agricultural pest, spreading freely over dry, unbroken ground and flourishing chiefly during the arid summer season” (W. L. Jepson 1909–1943, vol. 2).

Hirschfeldia incana can be confused with Brassica nigra because both have fruits appressed to the rachis. The former is distinguished from the latter by its distinctly shorter fruit, seeded and often swollen beak, and smaller petals.

Selected References


Lower Taxa

... more about "Hirschfeldia incana"
Suzanne I. Warwick +
(Linnaeus) Lagrèze-Fossat +
Sinapis incana +
Mediterranean mustard +  and summer- or hoary-mustard +
Calif. +, Nev. +, Oreg. +, Eurasia +, nw Africa +, introduced also in South America +, s Africa +, Atlantic Islands +, Pacific Islands (Hawaii) +  and Australia. +
100-1600 m +
Roadsides, waste places, disturbed areas, canyons, creek bottoms, dry fields, open desert +
Flowering Apr–Nov. +
Fl. Tarn Garonne, +
Weedy +, Introduced +  and Illustrated +
Brassica adpressa +, Brassica geniculata +, Hirschfeldia adpressa +  and Sinapis geniculata +
Hirschfeldia incana +
Hirschfeldia +
species +