Sidalcea calycosa

Sidalcea calycosa is a species of flowering plant in the mallow family known by the common names annual checkerbloom, checker mallow, and vernal pool checkerbloom.[1][2]

Sidalcea calycosa
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malvales
Family: Malvaceae
Genus: Sidalcea
Species:
S. calycosa
Binomial name
Sidalcea calycosa

Distribution

The plant is endemic to California, along the North Coast and adjacent Northern California Coast Ranges from Mendocino County to Marin County in the northern San Francisco Bay Area, and in sections of the western Sierra Nevada foothills from Butte County south into Tulare County.[1]

It grows in wetland habitats, including marshes and vernal pools, in oak woodland and chaparral openings, grasslands, and coastal salt marsh plant communities.[1]

Description

Sidalcea calycosa is a rhizomatous herb growing 30 centimetres (12 in) to nearly 1 metre (3.3 ft) tall. Despite its common name it may be annual or perennial, depending on the subspecies. The leaves have blades deeply divided into narrow linear lobes, almost divided into leaflets.

The inflorescence is a dense, showy panicle of several flowers each with five pink, purplish, or white petals up to 2.5 centimeters long. The bloom period is April through September.[1]

Subspecies

The two subspecies are:

  • Sidalcea calycosa ssp. calycosa — annual, blooms March to June, below 1,200 metres (3,900 ft).[3]
  • Sidalcea calycosa ssp. rhizomata — Point Reyes checkerbloom, the perennial subspecies, rare and known only from a few swampy areas of the coastline below 30 metres (98 ft) in Mendocino, Sonoma, and Marin Counties.[4][5]
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References
  1. Calflora Database: Sidalcea calycosa
  2. "Sidalcea calycosa". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 12 November 2015.
  3. Calflora: Sidalcea calycosa ssp. calycosa
  4. California Native Plant Society Rare Plant Profile
  5. Calflora: Sidalcea calycosa ssp. rhizomata (Point Reyes checkerbloom)


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