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Gutierrezia species [Asteraceae]

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Scientific Name Gutierrezia microcephala (Xanthocephalum microcephalum) USDA PLANTS Symbol GUMI
Common Name Threadleaf Snakeweed, Smallhead Snakeweed ITIS Taxonomic Serial No. 37482
Family Asteraceae (Sunflower) SEINet
Reference
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Description Habitat: Dry, gravelly or rocky limestone or gypsum soils in grasslands, brushlands or woodlands, often in disturbed or overgrazed areas; from 1,000 to 7,000 ft.
Plant: Perennial subshrub 12 to 40 inches tall, leafy, much-branched stems from a woody base.
Leaves: Alternate, primary leaves linear to linear-oblanceolate, 3/4 to 2 inches long and about 3/16-inch or less wide; often deciduous by flowering; clusters of shorter and narrower secondary leaves in axils of primary leaves; surfaces usually smooth and sticky.
Inflorescence: Many small composite yellow flower heads usually in clusters of 3 or more in corymbs atop the stems; each small blossom with 1 or 2 ray florets about 3/16-inch long and usually just one disk floret; phyllaries whitish or yellowish with green tips.
Bloom Period: June to October.
References: "Manual of the Vascular Plants of Texas" by Correll and Johnston, Flora of North America and SEINet.
BONAP Distribution Map

Texas Status:
Native
Scientific Name Gutierrezia sarothrae (Xanthocephalum sarothrae) USDA PLANTS Symbol GUSA2
Common Name Broom Snakeweed ITIS Taxonomic Serial No. 37483
Family Asteraceae (Sunflower) SEINet
Reference
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Description Habitat: Dry soils in open areas; common in sagebrush-grassland, pinyon-juniper, and desert shrub communities; 3000 to 7000 ft.
Plant: Perennial subshrub, 6 to 36 inches tall; multiple, leaning stems giving a rounded symmetrical crown densely covered with small bright yellow flowers.
Leaves: Alternate stem leaves, linear to lanceolate, sometimes filiform, less than 1.2 inches long and 0.1-inch wide; lower leaves absent at flowering.
Inflorescence: Dense, flat-topped panicles of small composite flowers about 0.5-inch across; 3 to 8 yellow ray florets and 3 to 9 yellow disk florets in the center; involucres are cylindrical to bell-shaped with whitish overlapping phyllaries with green tips.
Bloom Period: May to October.
References: "Manual of the Vascular Plants of Texas" by Correll and Johnston, "Flora of Colorado" by Jennifer Ackerfield, SW Colorado Wildflowers and SEINet
BONAP Distribution Map


Map Color Key
Texas Status:
Native

© Tom Lebsack 2022