| Holozonia | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Holozonia |
| Species: | H. filipes |
| Binomial name | |
| Holozonia filipes (Hook. & Arn.) Greene |
|
Holozonia is a monotypic genus of flowering plants in the daisy family containing the single species Holozonia filipes, which is known by the common name whitecrown. It is endemic to California, where it grows in a variety of habitats in the central part of the state. This is a scraggly rhizomatous perennial herb growing a hairy, glandular, branching stem 30 centimeters to 1.5 meters long. The lower stem is gray-green and the upper stem branches are green to red in color. The lance-shaped leaves are up to 9 or 10 centimeters long and covered in resin glands. They are arranged oppositely on the lower part of the stem. The flower heads appear at the ends of the stem branches in a loose inflorescence. Each has layers of sticky, hairy phyllaries. The ray florets are each divided into long lobes and are white in color. The disc florets are white with large purple anthers.