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BRASSICACEAE (Cruciferae) MUSTARD FAMILY

Ihsan A. Al-Shehbaz, except as noted

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.
± 330 genera, 3780 species: worldwide, especially temperate. [Al-Shehbaz et al. 2006 Plant Syst Evol 259:89–120] 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 North Coast Ranges, Carrichtera annua (L.) DC. in South Coast, Iberis sempervirens L., Iberis umbellata L. in Peninsular Ranges, Teesdalia coronopifolia (Bergeret) Thell., Teesdalia nudicaulis (L.) W.T. Aiton in southern Outer North Coast Ranges, Central Coast. Cardaria, Coronopus moved to Lepidium; Caulostramina to Hesperidanthus; Guillenia to Caulanthus; Heterodraba to Athysanus; California taxa of Lesquerella to Physaria; Malcolmia africana to Strigosella. —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.

Key to Brassicaceae

ERYSIMUM WALLFLOWER
Annual to subshrub [shrub]; hairs sessile, appressed, 2–5(8)-rayed. Leaf: basal rosetted, petioled, entire, dentate, or pinnately lobed; cauline sessile or petioled, bases not lobed. Inflorescence: elongated. Flower: sepals oblong to linear, erect, base of lateral pair sac-like or not; petals clawed, yellow or orange (white, purple, or brown). Fruit: silique, dehiscent, linear, cylindric, 4-sided, or flat parallel or perpendicular to septum, unsegmented; stigma entire or 2-lobed. Seed: 15–100, in 1 or 2 rows, plump or flattened, oblong, winged or not.
± 150 species: North America, Eurasia, northern Africa. (Greek: to help or save, from alleged medicinal properties of some species) [Rossbach 1958 Madroño 14:261–267] Fls, fruit, basal leaves needed for identification. All native California taxa related to Erysimum capitatum; hybridization blurs limits of some species.
Unabridged references: [Rollins 1993 Cruciferae of continental North America. Stanford Univ Press.]

Key to Erysimum

E. cheiranthoides L. WORMSEED MUSTARD
NATURALIZED
Annual. Stem: (0.7)1.5–10(15) dm. Leaf: basal, proximal cauline (0.2)0.5–1.2(2.3) cm wide, lanceolate or oblong, hairs 3–4(5)-rayed, margin entire to dentate. Flower: sepals 1.8–3.2 mm; petals 3–5.5 mm, 1.5–2 mm wide, yellow. Fruit: (1)1.5–2.5(4) cm, 1–1.3 mm wide, ± 4-angled, ± constricted between seeds; valves outside, inside with dense, 3–5-rayed hairs, midvein distinct; style 0.5–1.5 mm; pedicels spreading to ascending, 5–13(16) mm. Seed: (20)30–55, 1–1.4 mm, oblong; wing 0.
2n=16. Uncommon. Disturbed areas, fields, pastures; < 3000 m. Sierra Nevada, Great Central Valley; to eastern North America; circumboreal, native to Eurasia. Jun–Aug [Online Interchange]

Previous taxon: Erysimum capitatum var. purshii
Next taxon: Erysimum cheiri

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Jul 22 2014
Citation for this treatment: [Author of taxon treatment] 2013. Erysimum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=25126, accessed on Jul 22 2014

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Bioregions in which Erysimum cheiranthoides occurs Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.