Grindelia camporum is a species of flowering plant in the daisy family known by the common names Great Valley gumplant and Great Valley gumweed. The plant is native to California and Baja California, where it can be found in a number of habitats including chaparral and woodlands. Its range may extend into Nevada. It is hardy plant that also readily grows in disturbed and altered areas such as ditches and roadsides. Grindelia camporum is a gangly perennial up to 2 m (6 ft. ) in maximum height but usually less. Its erect, branching stems are lined with many stiff, wavy-edged, serrated leaves 2 to 3 cm long. Atop the stem branches are inflorescences of a single large flower head up to 3 cm wide. The head is a vaguely thistlelike cup of green clawlike phyllaries that bend downward. The centre of the head is filled with yellow disc florets and there are usually many yellow ray florets around the circumference. The flower head fills with a copious white exudate, especially during the early stages of blooming. It is a traditional Native American medicinal plant, used by the Indigenous peoples of California and also a major pollinator attractant.

Grindelia fraxinipratensis, Ash Meadows gumweed, is a North American species of flowering plants in the daisy family. It is native to the southwestern United States, in Mojave Desert regions in Nye County in Nevada and Inyo County in California. Some of the Nevada populations (including the type locality) lie inside the Nevada Test Site of the United States Atomic Energy CommissionSome sources spell the name as G. fraxino-pratensis. Grindelia fraxinipratensis is the accepted spelling according to the International Code of Nomenclature.

Grindelia hirsutula is 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; endemic to coastal California in the San Francisco Bay Area.

Grindelia hirsutula is 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; endemic to coastal California in the San Francisco Bay Area.

Tolerant of recycled water.

Grindelia nana is a species of flowering plant in the daisy family known by the common names Idaho gumplant and Idaho gumweed. It is native to western North America, especially the western United States, where it can be found in a number of dry habitats. This is a weedlike perennial herb growing mainly erect to heights between 20 centimeters and one meter. Its stems and foliage are mostly green with some reddish coloration. Leaves are up to 9 centimeters long. The tops of the stem branches bear flower heads one or two centimeters wide, which are bell-shaped with rounded bases. The head is a cup of green clawlike, curling or erect phyllaries. The center of the head is filled with many disc florets and the circumference is lined with golden yellow ray florets.

Grindelia stricta is a species of flowering plant in the Asteraceae (Sunflower) family known by the common names Coastal Gumweed and Oregon Gumweed. It is native to the west coast of North America from California to Alaska, where it is a resident of coastal plant communities such as those in marshes and beaches. In California it is found from the Channel Islands northwards, typically in close proximity to the coast. There are three recognized Varieties: This plant is variable in appearance, taking the form of a weedlike perennial herb forming low clumps to a sprawling subshrub growing erect to heights exceeding one meter. Its foliage and stems are green to rusty red or purplish and the plant may be hairy to hairless. The fleshy leaves are green, often with red edges and veining, and are up to 15 centimeters in length on large plants. The flower cluster holds one or more flower heads each up to 5 centimeters wide. The flower head is a cup of thick erect or recurved green phyllaries. Yellow disc florets fill the center of the flower head and there is a fringe of yellow ray florets around the circumference. The head produces copious white exudate, especially in the early stages of blooming. This exudate was used by native people as an adhesive.

Marsh Gumplant (Grindelia stricta var. angustifolia) is a native perennial herb that grows in northern, southern and central California. It tends to grow in tidal flats, at elevations from 0-1600 feet.

Gumweed (Grindelia stricta var. platyphylla) is a native perennial herb that grows in Southern and Central California, primarily in the Central Coast region. It is a member of the Asteraceae and has typical sunflower floral structure with yellow disk flowers and ray flowers. It tends to grow in tidal flats, coastal strand, and coastal sage scrub typically very near the ocean, at elevations from 0-700 feet. There are three recognized varieties of Grindelia stricta; var. platyphylla is broadly distributed along the coast from Del Norte County to Los Angeles County and the northern Channel Islands. The flower bud is distinctive in having large amount of sticky white sap which native people use as an adhesive. The plant has a prostrate, sprawling habit and roots as it spreads. It performs best in coastal gardens with sandy soil.

Oregon Gumweed (Grindelia stricta var. stricta) is a native perennial herb that grows in northern, southern and central California. It tends to grow in tidal flats, at elevations from 0-700 feet.

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.