Gutierrezia sphaerocephala

A. Gray

Mem. Amer. Acad. Arts, n. s. 4: 73. 1849.

Common names: Round-leaf snakeweed
Synonyms: Gutierrezia eriocarpa A. GrayXanthocephalum sphaerocephalum (A. Gray) ShinnersXanthocephalum sphaerocephalum var. eriocarpum (A. Gray) Shinners
Treatment appears in FNA Volume 20. Treatment on page 92. Mentioned on page 89.
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Annuals, 20–50 cm. Stems minutely, prominently, often sparsely, papillate-scabrous (hairs triangular or deltate to lanceolate, less than 0.1 mm). Leaves: proximal usually absent at flowering; cauline blades 1-nerved, linear, 0.5–1.2 mm wide, little reduced distally. Heads in loose arrays. Involucres campanulate, 2.5–5 mm diam. Phyllary apices flat. Ray florets 10–15; corollas yellow, 3–5.5 mm. Disc florets 18–37. Cypselae 0.9–1.2(–1.4) mm, faces without oil cavities, densely strigoso-sericeous in rows (hairs appressed to spreading, apices clavate); pappi of 1 series of narrowly triangular or narrowly oblong scales 0.2–1 mm (distinct or basally connate 1/4–3/4 their lengths, usually shorter in rays). 2n = 8 (10).


Phenology: Flowering (Feb–)May–Dec.
Habitat: Grasslands, roadsides, lake edges, alkaline flats with Atriplex, oak-pine-juniper woodlands, often over gypsum or limestone
Elevation: (200–)1300–2000 m

Distribution

V20-176-distribution-map.gif

Ariz., N.Mex., Tex., Mexico (Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Tamaulipas, Zacatecas).

Discussion

Selected References

None.

Lower Taxa

None.
Guy L. Nesom +
A. Gray +
Round-leaf snakeweed +
Ariz. +, N.Mex. +, Tex. +, Mexico (Chihuahua +, Coahuila +, Durango +, Nuevo León +, San Luis Potosí +, Tamaulipas +  and Zacatecas). +
(200–)1300–2000 m +
Grasslands, roadsides, lake edges, alkaline flats with Atriplex, oak-pine-juniper woodlands, often over gypsum or limestone +
Flowering (Feb–)May–Dec. +
Mem. Amer. Acad. Arts, n. s. +
Gutierrezia eriocarpa +, Xanthocephalum sphaerocephalum +  and Xanthocephalum sphaerocephalum var. eriocarpum +
Gutierrezia sphaerocephala +
Gutierrezia +
species +