Sidalcea calycosa is a native annual herb in the Malvaceae (Mallow) family that grows in central and northern California from the coast to the central valley and Sierra foothills. It tends to grow in marshes, vernal pools and other wet places, at elevations from sea level to 3,900 feet. There are two recognized subspecies. Ssp. rhizomata (Pt. Reyes Checkerbloom) is a rare plant found only along the coast in Marin, Sonoma and Mendocino counties. Sidalcea calycosa is most often seen as an annual, but if conditions are right it may become a weak perennial growing from a rhizome. In the garden it needs a very wet area and not too much competition. If conditions are good it will spread.
Sidalcea calycosa
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