| 词条 | Flaveria mcdougallii |
| 释义 |
| image = | image_caption = | regnum = Plantae | unranked_divisio = Angiosperms | unranked_classis = Eudicots | unranked_ordo = Asterids | ordo = Asterales | familia = Asteraceae | genus = Flaveria | species = F. mcdougallii | binomial = Flaveria mcdougallii | binomial_authority = M.E.Theroux, Pinkava & D.J.Keil 1977 }}Flaveria mcdougallii is a very rare North American plant species of yellowtops within the sunflower family. 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][2][3]Flaveria mcdougallii grows primarily near alkaline springs and springs along the Colorado River. It is a hairless subshrub up to {{convert|50|cm|in|abbr=on}} 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] References1. ^Biota of North America Program 2014 county distribution map {{Taxonbar|from=Q15597112}}{{Asteroideae-stub}}2. ^SEINet, Southwestern Biodiversity, Arizona chapter, Flaveria mcdougallii Theroux, Pinkava & D.J. Keil description, photos of herbarium specimens, distribution map 3. ^A Field Guide to the Special Status Plants of Grand Canyon National Park 4. ^1 [https://www.biodiversitylibrary.org/page/28003104#page/642/mode/1up Powell, Albert Michael. 1979. Annals of the Missouri Botanical Garden 65(2): 633-634] description and commentary in English, distribution map on page 610 5. ^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] 6 : Flaveria|Flora of Arizona|Endemic flora of the United States|Grand Canyon National Park|Hualapai|Plants described in 1977 |
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