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Vascular Plants of California
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Arabidopsis thaliana

Higher Taxonomy
Family: Brassicaceae (Cruciferae)View DescriptionDichotomous Key
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: ArabidopsisView Description 

Habit: 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.
Species In Genus: 10 species: Europe, Asia, North America. Etymology: (Greek: resembling Arabis)
eFlora Treatment Author: Ihsan A. Al-Shehbaz
Arabidopsis thaliana (L.) Heynh.
Habit: 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. Chromosomes: 2n=10.
Ecology: Disturbed ground, sandy areas, flats, fields; Elevation: < 1600 m. Bioregional Distribution: NW, ScV, CaR, n SN, SnFrB, SCo, Wrn; Distribution Outside California: to eastern United States where abundant; native to Eurasia. Flowering Time: Feb--May Note: Sp. widely used in experimental biology. Entire genome sequenced in 2000.
Jepson eFlora Author: Ihsan A. Al-Shehbaz
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

Previous taxon: Arabidopsis
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Botanical illustration including Arabidopsis thaliana

botanical illustration including Arabidopsis thaliana


Citation for this treatment: Ihsan A. Al-Shehbaz 2012, Arabidopsis thaliana, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on August 10, 2022.

Citation for the whole project: Jepson Flora Project (eds.) 2022, Jepson eFlora,, accessed on August 10, 2022.

Arabidopsis thaliana
click for enlargement
© 2008 Keir Morse
Arabidopsis thaliana
click for enlargement
© 2009 Barry Breckling
Arabidopsis thaliana
click for enlargement
© 2009 Barry Breckling
Arabidopsis thaliana
click for enlargement
© 2009 Barry Breckling
Arabidopsis thaliana
click for enlargement
© 2009 Barry Breckling
Arabidopsis thaliana
click for enlargement
© 2003 Michael Charters

More photos of Arabidopsis thaliana in CalPhotos

Geographic subdivisions for Arabidopsis thaliana:
NW, ScV, CaR, n SN, SnFrB, SCo, Wrn
1. You can change the display of the base map layer control box in the upper right-hand corner.
2. County and Jepson Region polygons can be turned off and on using the check boxes.
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).


Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

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 (fruiting time in some monocot genera).