''Calycoseris'' is a small genus of two species of annual desert wildflowers in the family

Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

, native to western North America in the

southwestern United States The Southwestern United States, also known as the American Southwest or simply the Southwest, is a geographic and cultural region of the United States that generally includes Arizona, New Mexico, and adjacent portions of California, Colorado, Ne ...

and Northwestern Mexico. They are characterized by the tack-shaped gland hairs on their upper stems and

bracts In botany, a bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis or cone scale. Bracts are usually different from foliage leaves. They may be smaller, larger, or of ...

, the trait which gives them the common name tackstem. The two species of tackstem are the yellow tackstem, '' Calycoseris parryi'' and the white tackstem, '' Calycoseris wrightii''.

References

External links

Jepson Manual Treatment of ''Calycoseris''USDA Plants Profile for ''Calycoseris''
Asteraceae genera Flora of Northwestern Mexico Flora of the Southwestern United States Flora of California Taxa named by Asa Gray {{Cichorieae-stub