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Ruppia maritima
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Beaked Tasselweed
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Ruppia maritima

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About Beaked Tasselweed (Ruppia maritima) Ruppia maritima is a species of aquatic plant known by the common names beaked tasselweed, widgeongrass, ditch-grass and tassel pondweed. Despite its Latin name, it is not a marine plant; is perhaps best described as a salt-tolerant freshwater species. The generic name Ruppia was dedicated by Linnaeus to the German botanist Heinrich Bernhard Ruppius (1689-1719) and the specific name (maritima) translates to "of the sea". It can be found throughout the world, most often in coastal areas, where it grows in brackish water bodies, such as marshes. It is a dominant plant in a great many shoreline regions. It does not grow well in turbid water or low-oxygen substrates.
Plant Description
Plant Type
Perennial herb

Max. Height
2.4 in (6.1 cm)


Growth Rate

Flower Color

Flowering Season

Native Status

Natural Setting
Elevation ?
-280' - 5198'

Annual Precip. ?
2.0" - 57.8"

Summer Precip. ?
0.15" - 1.61"

Coldest Month ?
42.9° F - 61.4° F

Hottest Month ?
58.7° F - 91.0° F

Humidity ?
0.32 vpd - 49.17 vpd

Soil Description
Prefers loamy or clay soils. Grows poorly in sandy soils.

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Widgeongrass, Tassel Pondweed, Ditch-grass

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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