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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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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
Annual [perennial herb]; hairs stellate, occasionally also simple. Stem: 1–several. Leaf: entire. Flower: sepals erect to spreading, bases not sac-like; petals yellow to cream, occasionally white in age; filaments slender or winged, toothed or not. Fruit: silicle, round (oblong), dehiscent, unsegmented, flat parallel to septum, glabrous or hairy; stigma entire. Seed: 1–2(4).Key to Alyssum
± 170 species: northern North America, Eurasia, northern Africa. (Greek: without rabies, supposed cure for hydrophobia and madness) Alyssum strigosum Banks & Sol. reports in California based on misidentified plants of Alyssum simplex.
Hairs stellate, coarse, appressed or not. Stem: erect (decumbent), (0.3)0.7–3(4) dm. Flower: sepals early-deciduous; petals 2–3.5 mm, light yellow; filaments winged, toothed. Fruit: (3.5)4–6.5(7) mm, round; hairs coarsely stellate, rays spreading; style 0.7–1.6 mm, hairy; pedicel spreading, 2–5(6) mm. Seed: 1.6–2 mm, ovate, margined or not.
2n=16. Roadsides, foothills, open rangeland; 1000–1500 m. Inner North Coast Ranges, Inner South Coast Ranges, Modoc Plateau; to Montana, Wyoming, northern Mexico; native to Europe, central and southwestern Asia, northern Africa. [Alyssum minus (L.) Rothm. var. micranthum (C.A. Mey.) T.R. Dudley; Alyssum minus subsp. micranthum (C.A. Mey.) Breistr.] Apr–Jul [Online Interchange]
Previous taxon: Alyssum desertorum
Next taxon: Anelsonia
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 15 2014
Citation for this treatment: [Author of taxon treatment] 2012. Alyssum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=80700, accessed on Apr 15 2014
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