''Trichoptilium'' is a
monotypic
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unisp ...
genus in the
daisy family
Asteraceae () is a large family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the order Asterales. The number of species in Asteraceae is rivaled only by the Orchidaceae, and which is the larger fam ...
containing the single species ''Trichoptilium incisum'', which is known by the common names yellowdome
and yellowhead.
Description
''Trichoptilium incisum'' grows up to tall.
It sends up stems from a basal rosette of sharply toothed leaves which are up to long
and covered in curly hairs and oil glands. Atop each stem is a rounded bright yellow
flower head
A pseudanthium (; : pseudanthia) is an inflorescence that resembles a flower. The word is sometimes used for other structures that are neither a true flower nor a true inflorescence. Examples of pseudanthia include flower heads, composite flowers ...
about wide
with only disc florets. Each head is a hemispherical button about 1 cm in diameter. The fruit is bristly with
pappus.
Distribution and habitat
The plant is native to the
Mojave and
Sonoran Desert
The Sonoran Desert () is a hot desert and ecoregion in North America that covers the northwestern Mexican states of Sonora, Baja California, and Baja California Sur, as well as part of the Southwestern United States (in Arizona and California). It ...
regions of the United States and Mexico.
It appears in late winter, and depending on rain, sometimes in autumn.
References
External links
*
Jepson Manual Treatment - ''Trichoptilium incisum''''Trichoptilium incisum'' - Photo gallery
Helenieae
Monotypic Asteraceae genera
Flora of the California desert regions
Flora of Nevada
Flora of Arizona
Flora of the Sonoran Deserts
Natural history of the Mojave Desert
Taxa named by Asa Gray
{{Helenieae-stub