Grindelia hirsutula

Grindelia hirsutula
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Asterids
Order:	Asterales
Family:	Asteraceae
Tribe:	Astereae
Genus:	Grindelia
Species:	G. hirsutula
Binomial name
Grindelia hirsutula Hook. & Arn. 1833
Synonyms[1]
Synonymy Donia glutinosa Hook. Grindelia acutifolia Steyerm. Grindelia arenicola Steyerm. Grindelia blakei Steyerm. Grindelia bracteosa J.T.Howell Grindelia brownii A.Heller Grindelia camporum Greene Grindelia collina J.K.Henry Grindelia columbiana (Piper) Rydb. Grindelia discoidea Nutt. 1840 not Hook. & Arn. 1836 Grindelia fastigiata Greene Grindelia hallii Steyerm. Grindelia hendersonii Greene Grindelia humilis Hook. & Arn. Grindelia inornata Greene Grindelia integerrima Rydb. Grindelia lanata Greene Grindelia latifolia Kellogg Grindelia macrophylla Greene Grindelia maritima (Greene) Steyerm. Grindelia nana Nutt. Grindelia oregana A.Gray Grindelia pacifica M.E.Jones Grindelia paludosa Greene Grindelia patens Greene Grindelia paysonorum H.St.John Grindelia perennis A.Nelson Grindelia procera Greene Grindelia revoluta Steyerm. Grindelia rubricaulis DC. Grindelia stricta DC. Grindelia venulosa Jeps. plus many more names at level of variety or form

Grindelia hirsutula is a North American species of flowering plant in the daisy family known by the common names hairy gumplant and hairy gumweed.^{[2] [3]}

Distribution

Grindelia hirsutula is native to North America, widespread across Canada and in California and Oregon. ^{[4] [5]} 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.^[6]

Description

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.^[6]

Varieties

• Grindelia hirsutula var. maritima — San Francisco Gum Plant, San Francisco gumplant, coastal gumweed; endemic to coastal California in the San Francisco Bay Area.^{[7] [8]}

References

1. The Plant List, Grindelia hirsutula Hook. & Arn.
2. Calflora taxon report, University of California, Grindelia hirsutula Hook. & Arn., Gumweed, hairy gumweed
3. Encyclopedia of Life: Grindelia hirsutula
4. Grindelia hirsutula information from NPGS/GRIN
5. USDA: Grindelia hirsutula distribution map
6. Flora of North America, Grindelia hirsutula Hooker & Arnott, Bot. 1833.
7. Calflora: Grindelia hirsutula var. maritima
8. USDA: Grindelia hirsutula var. maritima

External links

• USDA Plants Profile for Grindelia hirsutula (hairy gumweed)
• CalFlora Database: Grindelia hirsutula (gumweed, hairy gumweed)
• Jepson Manual Treatment of Grindelia hirsutula
• University of California, Calphoto Photos gallery— Grindelia hirsutula