''Calycoseris'' is a small genus of two species of

annual Annual may refer to: *Annual publication, periodical publications appearing regularly once per year **Yearbook **Literary annual *Annual plant *Annual report *Annual giving *Annual, Morocco, a settlement in northeastern Morocco *Annuals (band), a ...

desert wildflowers in the family

Asteraceae Asteraceae () is a large family (biology), family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the Order (biology), order Asterales. The number of species in Asteraceae is rivaled only by the Orchi ...

, 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 list of regions of the United States, region of the United States that includes Arizona and New Mexico, along with adjacen ...

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, associated with a reproductive structure such as a flower, inflorescence axis or cone scale. Bracts are usually different from foliage leaves in size, color, shape or texture. They also loo ...

, 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