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Suisun Gumplant
Grindelia x paludosa
About Suisun Gumplant (Grindelia x paludosa) 0 Nurseries Carry This Plant Suisun Gumplant (grindelia paludosa) is a putative stabilized hybrid between Grindelia camporum and Grindelia stricta var. angustifolia. It is endemic to the Suisun Bay Area, in the Deltaic Great Valley bioregion of California, growing in salt marshes and banks of sloughs. Its flowering time is between July and November.

Some botanists consider grindelia paludosa a synonym for Grindelia hirsutula, a North American species of flowering plant in the daisy family known by the common names hairy gumplant and hairy gumweed. Grindelia hirsutula is native to North America, widespread across Canada and in California and Oregon. The species is highly variable, and many local populations have been named as varieties or as distinct species. All these taxa do, however, intergrade with one another. Grindelia hirsutula is an erect perennial herb or subshrub sometimes as much as 250 cm (100 inches or 8 1/3 feet) tall but usually much shorter. The plant is usually green but the stems are often red or purplish-brown and the leaves can be somewhat yellowish to reddish. The plant can produce numerous flower heads in branching arrays at the top of the plant. Each head is 2 or 3 centimeters (0. 8-1. 2 inches) wide with hemispheric cups of greenish phyllaries around the base, the bracts claw-like and bent away from the flowers. The center of the head is filled with many small yellow disc florets surround by numerous golden ray florets. The head produces a thick white exudate, especially in new flower heads.
Varieties: Grindelia hirsutula var. maritima - San Francisco Gum Plant, San Francisco gumplant, coastal gumweed; is endemic to the the San Francisco Bay Area in coastal northern California.
Plant Description
Plant Type
Plant Type
Perennial herb

8.2 ft tall

Flower Color
Flower Color

Flowering Season
Flowering Season
Summer, Fall

Wildlife Supported
Native bees (pollen / nectar); Common Buckeye & Great Copper butterflies (nectar)

Butterflies & moths hosted ( 4 likely * ) SHOW ALL

Landscaping Information
Natural Setting
Site Type
Site Type
Salt marshes, slough banks

Annual Precipitation: 19.8" - 19.8", Summer Precipitation: 0.23" - 0.23", Coldest Month: 47.8" - 47.8", Hottest Month: 72.5" - 72.5", Humidity: 1.57" - 18.29", Elevation: 16" - 16"

Alternative Names
Botanical Names: Grindelia paludosa, Grindelia hirsutula
Common Names: Hairy Gumplant, Marsh Grindelia Hairy Gumweed

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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