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Arenaria paludicola

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About Marsh Sandwort (Arenaria paludicola) Arenaria paludicola is a species of flowering plant in the pink family known by the common names marsh sandwort and swamp sandwort. The plant grows in wet areas, such as marsh and bog. It is native to the west coast of North America in California, where it is known from only a few remaining occurrences in the Central Coast of California region. It is a federally listed endangered species in the United States. It is present in two native locations in San Luis Obispo County, California, and it has been reintroduced nearby in Nipomo and Los Osos. It is known from historical occurrences in Washington, but it may have been extirpated from that state. The plant may still exist in northern Mexico, but these occurrences are unconfirmed. This is a perennial herb which grows erect or trailing and draping over nearby plants and other objects for support. The slender stems are hairless and shiny, sometimes grooved, and approach 90 centimeters in maximum length. The stem has nodes at intervals and the nodes may root. Leaves are very narrow and lance-shaped. The inflorescence is composed of a single white flower. The fruit is a toothed capsule containing up to 20 tiny brown kidney-shaped seeds. Threats to the survival of this species include the destruction and alteration of its wetland habitat, shrinking of the local water table, and human activities such as off-roading.
Plant Description
Plant Type
Perennial herb

Max. Height
3 ft (0.9 m)

Flower Color

Native Status
Natural Setting
Elevation ?
13' - 1687'

Annual Precip. ?
11.6" - 48.0"

Summer Precip. ?
0.19" - 0.76"

Coldest Month ?
41.4° F - 55.8° F

Hottest Month ?
58.9° F - 79.5° F

Humidity ?
0.40 vpd - 26.29 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Swamp Sandwort

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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