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Vascular Plants of California
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Alyssum alyssoides

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: AlyssumView DescriptionDichotomous Key

Habit: 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)[8].
Species In Genus: +- 170 species: northern North America, Eurasia, northern Africa. Etymology: (Greek: without rabies, supposed cure for hydrophobia and madness) Note: Alyssum strigosum Banks & Sol. reports in California based on misidentified plants of Alyssum simplex.
eFlora Treatment Author: Ihsan A. Al-Shehbaz
Alyssum alyssoides (L.) L.
Habit: Hairs generally stellate, appressed, some spreading and simple. Stem: decumbent to erect, 0.5--3.5(5) dm. Flower: sepals persistent; petals 2--3(4) mm, linear to narrowly oblanceolate, cream, in age +- white; filaments slender, not winged. Fruit: (2)3--4(5) mm, round, bulged over seed, hairy; style 0.3--0.6(1) mm, glabrous to hairy at base; pedicel spreading to ascending, 2--6 mm. Seed: 1--2 mm, oblong to ovate; wing to 0.1 mm. Chromosomes: 2n=32.
Ecology: Disturbed areas, flats, ledges, bluffs; Elevation: < 1800 m. Bioregional Distribution: e KR, n SNH; Distribution Outside California: native to Europe, southwestern Asia, northern Africa. Flowering Time: May--Jul
Jepson eFlora Author: Ihsan A. Al-Shehbaz
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Botanical illustration including Alyssum alyssoides

botanical illustration including Alyssum alyssoides


Citation for this treatment: Ihsan A. Al-Shehbaz 2012, Alyssum alyssoides, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on February 18, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora,, accessed on February 18, 2019.

No expert verified images found for Alyssum alyssoides.

Geographic subdivisions for Alyssum alyssoides:
e KR, n SNH;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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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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.