Colors

Data mode

Account

Login
Sign up

Copy permalink to share

Grindelia Willdenow. Gum-plant, Tarweed, Rosinweed, Gumweed.

Key to Grindelia

A genus of about 55 species, herbs and shrubs, of w. North America and South America.

ID notes:Grindelia fits poorly into finite morphological boxes due to the wide variability in almost all of its major character states within species and the genus as a whole (hence, why it is keyed in multiple locations in the Asteraceae key to genera; some of these perhaps truly "fail-safe").

Ultimately the pappus of Grindelia (even when setiform scales are trending barbellate) is markedly different than the truly barbellate-barbellulate (and often much more numerous) bristles of other yellow-flowered, radiate composites with basal/alternate leaves (Key K).

Nonetheless, some of the general characters distinguishing this genus include cauline leaves often toothed with faces gland-dotted, phyllaries gummy and usually with apices curved or hooked, large globular heads, and a pappus of a few falling scales (but, see both Prionopsis and Grindelia in Asteraceae key).

Ref: Bartoli & Tortosa (2012); Cronquist (1980); Nesom (2019d); Strother & Wetter (2006a) In Flora of North America Editorial Committee (2006b). Show full citations.

Show in key(s)

Show parent family

Show species in Grindelia

Your browser does not support SVGs

Hover over a shape, letter, icon, or arrow on the map for definition or see the legend. Data for arrows not developed for genera and families which may have species only occurring outside the flora area.

image of plant© Jonathan Eisen, some rights reserved (CC BY), uploaded by Jonathan Eisen | Grindelia camporum source | Original Image ⭷ Warning: was NOT research grade.
image of plant© Michael Warner, some rights reserved (CC BY), uploaded by Michael Warner | Grindelia camporum source | Original Image ⭷ Warning: was NOT research grade.

Feedback

See something wrong or missing on about Grindelia? Let us know here:


Cite as...