Machaeranthera
Encyclopedia
Machaeranthera is a genus of flowering plants in the daisy family
which are known by the common name tansyaster. Tansyasters are variable in appearance. Some are small singular wildflowers while others are sprawling shrubs. Several species easily hybridize with each other as well, making identification difficult. In general, members of the genus may be identified by the sharp-pointed, dagger-shaped anthers
in the disc florets
at the center of the flower. The flower heads are usually daisylike and are usually a shade of purple or blue, but may be pink, yellow, or white. Tansyasters are native to western North America.
Species include:
Asteraceae
The Asteraceae or Compositae , is an exceedingly large and widespread family of vascular plants. The group has more than 22,750 currently accepted species, spread across 1620 genera and 12 subfamilies...
which are known by the common name tansyaster. Tansyasters are variable in appearance. Some are small singular wildflowers while others are sprawling shrubs. Several species easily hybridize with each other as well, making identification difficult. In general, members of the genus may be identified by the sharp-pointed, dagger-shaped anthers
Stamen
The stamen is the pollen producing reproductive organ of a flower...
in the disc florets
Head (botany)
The capitulum is considered the most derived form of inflorescence. Flower heads found outside Asteraceae show lesser degrees of specialization....
at the center of the flower. The flower heads are usually daisylike and are usually a shade of purple or blue, but may be pink, yellow, or white. Tansyasters are native to western North America.
Species include:
- Machaeranthera aridaMachaeranthera aridaMachaeranthera arida is a species of flowering plant in the aster family known by the common names arid tansyaster, desert tansyaster, and Silver Lake daisy. It is native to the deserts of northern Mexico and the southwestern United States, where it is widespread throughout desert habitat,...
- arid tansyaster - Machaeranthera asteroides - fall tansyaster
- Machaeranthera canescensMachaeranthera canescensMachaeranthera canescens is a species of flowering plant in the aster family known by the common names hoary tansyaster and hoary-aster. It is native to western and central North America, where it is a common plant in many regions and habitat types...
- hoary tansyaster - Machaeranthera carnosa - shrubby alkali aster
- Machaeranthera gracilisMachaeranthera gracilisMachaeranthera gracilis is a species of flowering plant in the aster family known by the common names slender goldenweed and annual bristleweed. It is native the southwestern United States and northern Mexico, where it grows in the deserts and plateaus. It is a bristly annual herb growing erect up...
- slender goldenweed - Machaeranthera grindelioides - rayless tansyaster
- Machaeranthera gypsophila - gypsum tansyaster
- Machaeranthera junceaMachaeranthera junceaMachaeranthera juncea is a species of flowering plant in the aster family known by the common name rushlike bristleweed. It is native to northern Mexico and it occurs in the United States only as far north as San Diego County, California. It grows in coastal and inland slopes and canyons. It is a...
- rush bristleweed - Machaeranthera pinnatifida - lacy tansyaster
- Machaeranthera tagetina - mesa tansyaster
- Machaeranthera tanacetifoliaMachaeranthera tanacetifoliaMachaeranthera tanacetifolia is a species of flowering plant in the aster family known by the common names tansyleaf tansyaster and Tahoka daisy. It is native to northern Mexico and the southwestern and central United States, where it grows in several types of habitat...
- tansyleaf tansyaster - Machaeranthera viscida - sticky tansyaster