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Vascular Plants of California
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Sinapis alba
WHITE MUSTARD


Higher Taxonomy
Family: Brassicaceae (Cruciferae)View DescriptionDichotomous Key
Common Name: MUSTARD FAMILY
Habit: Annual to shrub; sap pungent, watery. Leaf: generally simple, alternate; generally both basal, cauline; stipules 0. Inflorescence: generally raceme, generally not bracted. Flower: bisexual, generally radial; sepals 4, generally free; petals (0)4, forming a cross, generally white or yellow to purple; stamens generally 6 (2 or 4), 4 long, 2 short (3 pairs of unequal length); ovary 1, superior, generally 2-chambered with septum connecting 2 parietal placentas; style 1, stigma entire or 2-lobed. Fruit: capsule, generally 2-valved, "silique" (length >= 3 × width) or "silicle" (length < 3 × width), dehiscent by 2 valves or indehiscent, cylindric or flat parallel or perpendicular to septum, segmented or not. Seed: 1--many, in 1 or 2 rows per chamber, winged or wingless; embryo strongly curved.
Genera In Family: +- 330 genera, 3780 species: worldwide, especially temperate. Note: Highest diversity in Mediterranean area, mountains of southwestern Asia, adjacent central Asia, western North America; some Brassica species are oil or vegetable crops; Arabidopsis thaliana used in experimental molecular biology; many species are ornamentals, weeds. Aurinia saxatilis (L.) Desvaux in cultivation only. Aubrieta occasional waif in central NCoR, Carrichtera annua (L.) DC. in SCo, Iberis sempervirens L., Iberis umbellata L. in PR, Teesdalia coronopifolia (Bergeret) Thell., Teesdalia nudicaulis (L.) W.T. Aiton in southern NCoRO, CCo. Cardaria, Coronopus moved to Lepidium; Caulostramina to Hesperidanthus; Guillenia to Caulanthus; Heterodraba to Athysanus; California taxa of Lesquerella to Physaria; Malcolmia africana to Strigosella.
eFlora Treatment Author: Ihsan A. Al-Shehbaz, except as noted
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: SinapisView DescriptionDichotomous Key


Habit: Annual [perennial herb]; hairs 0 or simple. Leaf: basal not rosetted, petioled, dentate to 1- or 2-pinnately lobed; distal reduced, sessile or short-petioled, base not lobed. Inflorescence: elongated. Flower: sepals oblong to linear, spreading, base not sac-like; petals yellow, obovate, clawed. Fruit: silique, dehiscent, linear to lanceolate, cylindric, +- 4-angled, or flat parallel to septum, generally constricted between seeds, segmented; terminal segment 1- or 2-seeded or seeds 0; proximal segment few- to several-seeded, valves prominently 3--7-veined; stigma 2-lobed. Seed: 4--16(24), in 1 row, spheric, wingless.
Species In Genus: 5 species: Mediterranean, Eurasia. Etymology: (Latin: mustard, from flavor of seeds)
eFlora Treatment Author: Ihsan A. Al-Shehbaz
Sinapis alba L.
NATURALIZED
Habit: Hairy (glabrous). Stem: (1.5)2.5--10(22) dm. Leaf: basal blade (3.5)5--14(20) cm, 2--6(8) cm wide, oblong to ovate or lanceolate in outline, pinnately lobed; lateral lobes 1--3 pairs, dentate (lobed); distal cauline short-petioled, coarsely dentate (entire). Flower: sepals (3.8)4--7(8) mm; petals (0.7)0.8--1.2(1.4) cm, (3)4--6(7) mm wide, pale yellow. Fruit: (1.5)2--4.2(5) cm, (2)3--5.5(6.5) mm wide; proximal segment (0.5)0.7--1.7(2) cm; terminal segment seedless; pedicels spreading, (3)6--12(17) mm. Seed: (1.7)2--3(3.5) mm wide. Chromosomes: 2n=24.
Ecology: Fields, disturbed areas; Elevation: < 1500 m. Bioregional Distribution: NCoRH, CCo, SCo; Distribution Outside California: North America, native to Eurasia. Flowering Time: Mar--Sep
Unabridged Synonyms: Brassica alba (L.) Rabenh.; Brassica hirta Moench.
Jepson eFlora Author: Ihsan A. Al-Shehbaz
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botanical illustration including Sinapis alba

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Citation for this treatment: Ihsan A. Al-Shehbaz 2012, Sinapis alba, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=44608, accessed on December 06, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on December 06, 2019.

No expert verified images found for Sinapis alba.



Geographic subdivisions for Sinapis alba:
NCoRH, CCo, SCo
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).





 

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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.