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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

ARABIS ROCKCRESS
Annual, biennial, perennial herb; base not woody; hairs simple, forked, or stellate; caudex branched or not. Stem: branched or not, leafy. Leaf: basal rosetted, petioled, entire or dentate; cauline sessile, entire or dentate, base lobed or not. Flower: sepals erect or ascending, base of lateral pair sac-like or not; petals spoon-shaped to oblong, oblanceolate, or obovate, white to pink or deep purple. Fruit: silique, erect to spreading, linear, dehiscent, unsegmented, straight, flat parallel to septum, glabrous. Seed: 12–110, 1 row per chamber, flat, winged or margined.
< 70 species: temperate North America, Eurasia, northern Africa. (Latin: of Arabia) Most species of Arabis in TJM (1993) moved to Boechera; Arabis glabra to Turritis. California record of Arabis aculeolata Greene not confirmed.

Key to Arabis

A. eschscholtziana Ledeb.
NATIVE
Biennial or perennial herb; caudex branches 0–few; hairs simple to forked or 0. Stem: 1–few, generally branched distally, 2–7(10) dm, hairy (glabrous). Leaf: basal 2–13 cm, narrowly oblanceolate to spoon-shaped, entire or dentate, hairy to glabrous; cauline (2)4–12(18), generally well spaced, basally lobed. Flower: sepals 3.5–5 mm, base of lateral pair sac-like; petals (5.5)6.5–9(10) mm, 1.5–3 mm wide, narrowly spoon-shaped to linear-oblanceolate, white (pink). Fruit: erect to ascending, 3.5–6.5 cm, 1.2–2 mm wide; style (0.1)0.3–1 mm; pedicel erect to ascending, 3.5–10(15) mm, slender, glabrous or sparsely hairy. Seed: 54–80, 1–1.8 mm, oblong; wing to 0.2 mm wide, or 0.
2n=32,64. Gravelly soils, swales, open woodland, meadows, rock crevices, ledges; < 2800 m. Klamath Ranges, Outer North Coast Ranges, Cascade Range, Sierra Nevada, San Bernardino Mountains, White and Inyo Mountains; to Alaska, Yukon Territory, Wyoming, Nevada. [Arabis hirsuta (L.) Scop. var. glabrata Torr. & A. Gray] May–Jul [Online Interchange]
Unabridged synonyms: [Arabis hirsuta (L.) Scop. var. eschscholtziana (Andrz. ex Ledeb.) Rollins]
Unabridged note: Expanded author citation: Arabis eschscholtziana Andrz. ex Ledeb.

Previous taxon: Arabis blepharophylla
Next taxon: Arabis mcdonaldiana

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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 25 2014
Citation for this treatment: [Author of taxon treatment] 2013. Arabis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=91726, accessed on Jul 25 2014

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Bioregions in which Arabis eschscholtziana 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.