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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

ARABIDOPSIS
Annual [perennial herb]; hairs simple, forked. Stem: 1–few, branched or not, slender. Leaf: basal rosetted, petioled, entire to dentate [lobed]; cauline sessile, entire or toothed, base not lobed. Inflorescence: terminal. Flower: sepal bases not sac-like; petals white [pink or purple]. Fruit: silique, linear, glabrous, dehiscent, unsegmented, cylindric [flat parallel to septum]; pedicel ascending to spreading; stigma entire. Seed: many, 1 row per chamber, plump; wing 0.
10 species: Europe, Asia, North America. (Greek: resembling Arabis)

A. thaliana (L.) Heynh. MOUSE-EAR CRESS, THALE CRESS
NATURALIZED
Branched. Stem: erect, 0.5–3(5) dm; hairs below simple and forked, spreading, above 0. Leaf: basal, 0.8–3.5(4.5) cm, (1)2–10(15) mm wide, oblanceolate, entire or minutely dentate, hairs 2–4-rayed; cauline few, 0.4–1.8(2.5) cm, 1–6(10) mm wide, base tapered. Flower: petals 2–3.5(4) mm, white. Fruit: 1–1.5 cm, 0.5–0.8 mm wide; pedicel spreading, 3–10(15) mm, slender. Seed: 40–70, 0.3–0.5 mm, oblong.
2n=10. Disturbed ground, sandy areas, flats, fields; < 1600 m. Northwestern California, Sacramento Valley, Cascade Range, n Sierra Nevada, San Francisco Bay Area, South Coast, Warner Mountains; to eastern United States where abundant; native to Eurasia. Sp. widely used in experimental biology. Entire genome sequenced in 2000. Feb–May [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Sep 2 2014
Citation for this treatment: [Author of taxon treatment] 2013. Arabidopsis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=13682, accessed on Sep 2 2014

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click for enlargement Arabidopsis thaliana
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© 2003 Jennifer Forman

Geographic subdivisions indicated for the distribution of Arabidopsis thaliana 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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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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Data provided by the participants of the Consortium of California Herbaria.
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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.