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Calycoseris wrightii, commonly known as white tackstem, is an annual spring wildflower, one of two species in the genus Calycoseris; the other species is C. parryi, the yellow tackstem. They are part of the family Asteraceae.

Calycoseris wrightii
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Calycoseris
Species:	C. wrightii
Binomial name
Calycoseris wrightii A.Gray

White tackstem is found in the southwestern United States and northwestern Mexico in California, Nevada, southwestern Utah (Washington County), New Mexico, Arizona, northern Baja California, Sonora, western Texas (El Paso County).United States Department of Agriculture .[1][2]

Calycoseris wrightii is a white daisy-like flower up to more than 2.0 inches (5 cm) across; when it grows supported amongst other plants it can be more than 45 cm (18 inches) tall. It has one easy distinguishing feature: the closed outside of the ray florets contain two linear purple stripes (fine reddish veins abaxially – 2 to 3 cm (1 in)). It is a spring wildflower found in the desert regions and is plentiful after winter rains. It grows up to 4000 ft (1,220 m) elevation.[3]

References

External links

• USDA Plants Profile for Calycoseris wrightii (white tackstem)
• Calflora Database: Calycoseris wrightii (White tackstem)
• Jepson Manual eFlora (TJM2) treatment of Calycoseris wrightii
• Calycoseris wrightii in the CalPhotos photo database, University of California, Berkeley
  • UC Calphotos gallery: Image of closed flower with stripes
• Cycloseris wrightii at Lady Bird Johnson Wildflower Center-NPIN: Calycoseris wrightii
• "Death Valley National Park: White Blossoms". National Park Service. Archived from the original on 2008-02-24. — Close-up of flower-head (High Res photo)^{[dead link]}

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