Fournerve Daisies

Tetraneuris, commonly known as four-nerve daisy or bitterweed, is a genus of North American plants in the sneezeweed tribe within the daisy family.

The genus includes one annual species, Tetraneuris linearifolia, with all the other species being perennials.

The name is of Greek origin, deriving from tetra, meaning "four", and neuron, meaning "nerve", which refers to the venation of the rays: three-lobed with the outer lobes themselves having an apparent vein down the middle.

Species

Tetraneuris acaulis – western Canada, western USA, northern Mexico

Tetraneuris argentea – Arizona, New Mexico

Tetraneuris herbacea – Ontario, Michigan, Ohio, Illinois

Tetraneuris ivesiana – Utah, Colorado, New Mexico, Arizona

Tetraneuris linearifolia - Tamaulipas, Coahuila, Nuevo León, Kansas, Oklahoma, Texas, New Mexico

Tetraneuris scaposa – Chihuahua, Tamaulipas, Coahuila, Nuevo León, San Luis Potosí, Zacatecas, Nebraska, Kansas, Oklahoma, Texas, Colorado, New Mexico

Tetraneuris torreyana – Arizona, New Mexico, Utah, Colorado, Wyoming, Montana

Tetraneuris turneri – Coahuila, Texas

Tetraneuris verdiensis – Arizona

formerly included

see Hymenoxys

Tetraneuris brandegeei - Hymenoxys brandegeei

Tetraneuris grandiflora - Hymenoxys grandiflora