''Hymenoxys ambigens'' is a species of flowering plant 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 ...

known by the common name Pinaleño Mountains rubberweed. It is native to the states of

Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...

and

New Mexico ) , population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano) , seat = Santa Fe , LargestCity = Albuquerque , LargestMetro = Tiguex , OfficialLang = None , Languages = English, Spanish ( New Mexican), Navajo, Ker ...

in the southwestern United States. ''Hymenoxys ambigens'' is a perennial herb up to 150 cm (5 feet) tall. Leaves have very narrow lobes resembling branching threads. One plant can produce an array of 25–400 small yellow flower heads, each head with 3-5 ray flowers and 6–15 disc flowers.Flora of North America, ''Hymenoxys ambigens'' (S. F. Blake) Bierner, 1994. Pinaleño Mountains rubberweed
/ref> ;Varieties *''Hymenoxys ambigens'' var. ''ambigens'' - Mescal, Pinaleño, and

Santa Teresa Mountains The Santa Teresa Mountains are a mountain range located within the Coronado National Forest and partly within the San Carlos Apache Indian Reservation, in western Graham County, Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣona ...

*''Hymenoxys ambigens'' var. ''floribunda'' (A.Gray) W.L.Wagner -

Chiricahua Chiricahua ( ) is a band of Apache Native Americans. Based in the Southern Plains and Southwestern United States, the Chiricahua (Tsokanende ) are related to other Apache groups: Ndendahe (Mogollon, Carrizaleño), Tchihende (Mimbreño), Sehende ...

, Dos Cabezas,

Dragoon Dragoons were originally a class of mounted infantry, who used horses for mobility, but dismounted to fight on foot. From the early 17th century onward, dragoons were increasingly also employed as conventional cavalry and trained for combat w ...

, Little Dragoon, and

Mule Mountains The Mule Mountains are a north/south running mountain range located in the south-central area of Cochise County, Arizona. The highest peak, Mount Ballard, rises to . Prior to mining operations commencing there, the mountains were heavily fo ...

*''Hymenoxys ambigens'' var. ''neomexicana'' W. L. Wagner - Animas + Peloncillo Mountains in

History

In 1882, Sarah Plummer Lemmon discovered the species. Harvard University botanist,

Asa Gray Asa Gray (November 18, 1810 – January 30, 1888) is considered the most important American botanist of the 19th century. His ''Darwiniana'' was considered an important explanation of how religion and science were not necessarily mutually excl ...

, first described the species, naming it ''Plummera floribund''a in her honor. ''Plummera'' was redefined as a subgenus of ''Hymenoxys'' in 1994.Bierner, Mark W 199
SUBMERSION OF DUGALDIA AND PLUMMERA IN HYMENOXYS (ASTERACEAE: HELIANTHEAE: GAILLARDIINAE)
''Sida, Contributions To Botany'' Volume: 16:1-8

References

External links

ambigens Flora of Arizona Flora of New Mexico ~ Plants described in 1929 {{Asteroideae-stub