''Flaveria mcdougallii'' is a very rare North American plant species of ''

Flaveria ''Flaveria'' is a genus of plants in the family Asteraceae. They are sometimes called yellowtops. Some are annual or perennial herbs and some are shrubs. They bear yellow flowers in heads, with zero, one, or two ray florets in each head. These pl ...

'' within the family

Asteraceae 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 ...

. It has been found in 4 locations in the

Grand Canyon The Grand Canyon (, yuf-x-yav, Wi:kaʼi:la, , Southern Paiute language: Paxa’uipi, ) is a steep-sided canyon carved by the Colorado River in Arizona, United States. The Grand Canyon is long, up to wide and attains a depth of over a m ...

in northwestern

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 ...

in the southwestern United States, in Mohave County and

Coconino County Coconino County is a county in the north-central part of the U.S. state of Arizona. Its population was 145,101 at the 2020 census. The county seat is Flagstaff. The county takes its name from ''Cohonino'', a name applied to the Havasupai p ...

. Many of the populations lie inside

Grand Canyon National Park Grand Canyon National Park, located in northwestern Arizona, is the 15th site in the United States to have been named as a national park. The park's central feature is the Grand Canyon, a gorge of the Colorado River, which is often consider ...

, others within the

Hualapai Indian Reservation The Hualapai (, , yuf-x-wal, Hwalbáy) is a federally recognized Native American tribe in Arizona with about 2300 enrolled members. Approximately 1353 enrolled members reside on the Hualapai Reservation, which spans over three counties in Nort ...

. ''Flaveria mcdougallii'' grows primarily near alkaline springs and springs along the

Colorado River The Colorado River ( es, Río Colorado) is one of the principal rivers (along with the Rio Grande) in the Southwestern United States and northern Mexico. The river drains an expansive, arid drainage basin, watershed that encompasses parts of ...

. It is a hairless subshrub up to tall. One plant can sometimes produce 200 or more small yellow flower heads in a flat-topped cluster. Each head contains 2–6 disc flowers but no ray flowers.Powell, Albert Michael. 1979. Annals of the Missouri Botanical Garden 65(2): 633–634
description and commentary in English, distribution map on page 610Michael E. Theroux, Donald J. Pinkava and David J. Keil. 1977. A new species of ''Flaveria'' (compositae: flaveriinae) from Grand Canyon, Arizona. Madroño 24:13–17
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References

{{Taxonbar, from=Q15597112 mcdougallii Flora of Arizona Endemic flora of the United States Grand Canyon National Park Hualapai Plants described in 1977