Erysimum franciscanum
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Erysimum franciscanum, commonly known as the Franciscan wallflower or San Francisco wallflower, is a plant endemic to the northern California coast, from Sonoma to Santa Cruz Counties. It is a member of the genus Erysimum in the mustard family, the Brassicaceae.
The plant is a biennial or short-lived perennial.<ref>Jepson Manual Treatment</ref><ref name=dwyer>Dwyer, D. The Biogeography of the San Francisco Wallflower</ref> The flowers are cream-colored to yellow, with four sepals and four petals arranged in a cross shape, as is characteristic of the Brassicaceae.<ref name=nps>National Park Service: San Francisco Presidio</ref> It flowers from late winter to late spring.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The plant prefers open scrubby areas with a fair amount of sunlight, but can flourish on a range of soils including disintegrating serpentine, gravelly and sandy soils.<ref>The Nature Conservancy</ref> It is fairly easily cultivated in gardens.<ref name=dwyer/>
Although not formally recognized as endangered, the Franciscan wallflower has a limited, discontinuous distribution. It is monitored at the Presidio of San Francisco, which was also its type locality.<ref name=nps/> The plant is propagated in a nursery there and then planted in its native habitat.<ref name=dwyer/>