''Hymenothrix wislizeni'', the Trans-Pecos thimblehead, is a North American species of flowering plant 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 ...

. It grows in northwestern Mexico (

Baja California Baja California, officially the Free and Sovereign State of Baja California, is a state in Mexico. It is the northwesternmost of the 32 federal entities of Mexico. Before becoming a state in 1952, the area was known as the North Territory of B ...

Sonora Sonora (), officially Estado Libre y Soberano de Sonora (), is one of the 31 states which, along with Mexico City, comprise the Administrative divisions of Mexico, Federal Entities of Mexico. The state is divided into Municipalities of Sonora, 72 ...

, Chihuahua) and the southwestern United States (far western

Texas Texas ( , ; or ) is the most populous U.S. state, state in the South Central United States, South Central region of the United States. It borders Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the we ...

Arizona Arizona is a U.S. state, state in the Southwestern United States, Southwestern region of the United States, sharing the Four Corners region of the western United States with Colorado, New Mexico, and Utah. It also borders Nevada to the nort ...

New Mexico New Mexico is a state in the Southwestern United States, Southwestern region of the United States. It is one of the Mountain States of the southern Rocky Mountains, sharing the Four Corners region with Utah, Colorado, and Arizona. It also ...

). ''Hymenothrix wislizeni'' is an annual herb up to tall. Each head has 15-30 yellow or cream-colored disc flowers surrounded by 8-12 yellow ray flowers.Flora of North America, ''Hymenothrix wislizeni'' A. Gray, 1849.
/ref>Gray, Asa. 1849. Memoirs of the American Academy of Arts and Science, new series 4(1): 102
/ref>

References

External links

Photo of herbarium specimen at Missouri Botanical Garden, collected in Chihuahua in 1846, type specimen for ''Hymenothrix wislizeni''
Bahieae Flora of Arizona Flora of Baja California Flora of Chihuahua (state) Flora of New Mexico Flora of Sonora Flora of Texas Flora of the Chihuahuan Desert Plants described in 1849 Taxa named by Asa Gray {{Asteroideae-stub