Grindelia squarrosa var. squarrosa

(Curlycup Gumweed)

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Grindelia squarrosa var. squarrosa, Newcastle-Buford Rd., Garfield Co. 6253

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Grindelia squarrosa var. squarrosa, Newcastle-Buford Rd., Garfield Co. 6265

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Grindelia squarrosa var. squarrosa, Newcastle-Buford Rd., Garfield Co. 6270

Scientific Name Grindelia squarrosa var. squarrosa USDA PLANTS Symbol GRSQ
Common Name Curlycup Gumweed ITIS Taxonomic Serial No. 37472
Family Asteraceae (Sunflower) SEINet
Reference
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Description Life zones and habitat: Plains and foothills (3500 to 8500 ft.); dry soils in open areas, roadsides, disturbed sites.
Plant: Perennial or biennial, 4 to 40 inches tall; stems erect or occasionally lying on the ground; usually whitish-green, sometimes reddish or grayish, and smooth.
Leaves: Alternate, oblong to oblanceolate, clasping, glandular surfaces, 5/8 to 2-3/4 inches long; teeth along margins are rather evenly-spaced, crenulate-serrate, short, rounded and gland-tipped.
Inflorescence: Composite flower heads in clusters, 1 to 2+ inches across with 25 to 40 yellow rays (or sometimes, none) surrounding the center of 25 to 40 yellow disk florets; 5 to 6 layers of sticky phyllaries below are fleshy with tips usually strongly recurved or hooked to nearly straight.
Bloom Period: June to October.
References: "Flora of Colorado" by Jennifer Ackerfield, American Southwest and SEINet.
BONAP Distribution Map


Map Color Key
Colorado Status:
Native

© Tom Lebsack 2024

Banner photo: Castilleja rhexifolia and a brewing storm over the San Juan Mountains