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Sweet Marsh Ragwort
Senecio hydrophiloides
About Sweet Marsh Ragwort (Senecio hydrophiloides) 0 Nurseries Carry This Plant Senecio hydrophiloides is a species of flowering plant in the aster family known by the common names tall groundsel and sweet marsh ragwort. It is native to western North America from British Columbia and Alberta to northern California to Utah, where it grows in wet meadows and similar habitat. It is a biennial or perennial herb producing a single erect stem or a cluster of a few stems which may exceed one meter in maximum height. The plants are green to red in color and usually without hairs, but new growth can be woolly. The leaves are lance-shaped to oval with toothed edges, the blades up to 25 centimeters long and borne on long winged petioles. The leaves are firm and sometimes a bit fleshy. The inflorescence is a loose or dense cluster of up to 30 or more flower heads lined with black-tipped phyllaries. They contain many yellowish disc florets at the center and often have some yellow ray florets, though these are sometimes absent.
Plant Description
Plant Type
Plant Type
Perennial herb

0.8 - 3.3 ft tall


Growth Rate
Growth Rate

Flower Color
Flower Color

Flowering Season
Flowering Season

Wildlife Supported

Landscaping Information
Soil Description
Soil Description
Adaptable, tolerant of sand, loam and clay

Natural Setting
Annual Precipitation: 9.8" - 78.2", Summer Precipitation: 0.71" - 2.78", Coldest Month: 25.2" - 48.6", Hottest Month: 50.0" - 70.9", Humidity: 0.84" - 20.56", Elevation: 2184" - 9074"

Alternative Names
Common Names: Tall Groundsel, Tall Groundwel

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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