''Coreocarpus arizonicus'', the little lemonhead, is a North American species of flowering plants in the

daisy family The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

native to northwestern

Mexico Mexico ( Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guate ...

and the

southwestern United States The Southwestern United States, also known as the American Southwest or simply the Southwest, is a geographic and cultural region of the United States that generally includes Arizona, New Mexico, and adjacent portions of California, Colorado, N ...

. It has been found in southern

Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a U.S. state, state in the Southwestern United States. It is the list of U.S. states and territories by area, 6th largest and the list of U.S. states and territories by population, 14 ...

(

Pima Pima or PIMA may refer to: People * Pima people, the Akimel O'odham, Indigenous peoples in Arizona (U.S.) and Sonora (Mexico) Places * Pima, Arizona, a town in Graham County * Pima County, Arizona * Pima Canyon, in the Santa Catalina Mountains ...

, Santa Cruz, Cochise Counties), and in the adjacent Mexican States of

Sonora Sonora (), officially Estado Libre y Soberano de Sonora ( en, Free and Sovereign State of Sonora), is one of the 31 states which, along with Mexico City, comprise the Federal Entities of Mexico. The state is divided into 72 municipalities; the ...

Chihuahua Chihuahua may refer to: Places *Chihuahua (state), a Mexican state **Chihuahua (dog), a breed of dog named after the state **Chihuahua cheese, a type of cheese originating in the state **Chihuahua City, the capital city of the state **Chihuahua Mun ...

Sinaloa Sinaloa (), officially the Estado Libre y Soberano de Sinaloa ( en, Free and Sovereign State of Sinaloa), is one of the 31 states which, along with Mexico City, comprise the Federal Entities of Mexico. It is divided into 18 municipalities and ...

, and

Baja California Sur Baja California Sur (; 'South Lower California'), officially the Free and Sovereign State of Baja California Sur ( es, Estado Libre y Soberano de Baja California Sur), is the least populated state and the 31st admitted state of the 32 federal ent ...

.Blake, Sydney Fay 1913. Proceedings of the American Academy of Arts and Sciences 49: 344
/ref> ''Coreocarpus arizonicus'' is a branching

perennial A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wide ...

subshrub up to 120 cm (48 inches) tall. The plant usually produces several

flower heads A pseudanthium (Greek for "false flower"; ) 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, compos ...

, each head having yellow

disc floret The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae we ...

s and white, purplish, yellow, or orange

ray florets The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae we ...

. Sometimes the

are missing. The species grows in open sites along streams and in mountain canyons. ;VarietiesSEINet Southwest Biodiversity, Arizona Chapter, ''Coreocarpus arizonicus'' (A. Gray) Blake
/ref> * ''Coreocarpus arizonicus'' var. ''arizonicus'' -

* ''Coreocarpus arizonicus'' var. ''filiformis'' (Greenm.) S.F.Blake -

* ''Coreocarpus arizonicus'' var. ''macrophyllus'' Sherff -

* ''Coreocarpus arizonicus'' var. ''pubescens'' (B.L.Rob. & Fernald) S.F.Blake -

* ''Coreocarpus arizonicus'' var. ''sanpedroensis'' (E.B.Sm.) B.L.Turner -

References

Coreopsideae Plants described in 1882 Flora of Northwestern Mexico Flora of Arizona {{asteroideae-stub