Flaveria mcdougallii explained

Flaveria mcdougallii is a very rare North American plant species of Flaveria within the family Asteraceae. It has been found in 4 locations in the Grand Canyon in northwestern Arizona in the southwestern United States, in Mohave County and Coconino County. Many of the populations lie inside Grand Canyon National Park, others within the Hualapai Indian Reservation.^{[1] [2] [3]}

Flaveria mcdougallii grows primarily near alkaline springs and springs along the Colorado River. It is a hairless subshrub up to 50cm (20inches) 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.^{[4] [5] [6]}

Notes and References

1. http://bonap.net/MapGallery/County/Flaveria%20mcdougallii.png Biota of North America Program 2014 county distribution map
2. http://swbiodiversity.org/seinet/taxa/index.php?taxon=16273 SEINet, Southwestern Biodiversity, Arizona chapter, Flaveria mcdougallii Theroux, Pinkava & D.J. Keil
3. http://www.nps.gov/grca/learn/nature/upload/plant_guide_2.pdf A Field Guide to the Special Status Plants of Grand Canyon National Park
4. https://www.biodiversitylibrary.org/page/28003104#page/642/mode/1up Powell, Albert Michael. 1979. Annals of the Missouri Botanical Garden 65(2): 633–634
5. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066776 Flora of North America, Flaveria mcdougallii M. E. Theroux, Pinkava & D. J. Keil, 1977.
6. https://www.jstor.org/stable/41426106?seq=1#page_scan_tab_contents Michael 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