Coreocarpus arizonicus explained

Coreocarpus arizonicus, the little lemonhead, is a North American species of flowering plants in the daisy family native to northwestern Mexico and the southwestern United States. It has been found in southern Arizona (Pima, Santa Cruz, Cochise Counties),^[1] and in the adjacent Mexican States of Sonora, Chihuahua, Sinaloa, and Baja California Sur.^{[2] [3] [4]}

Coreocarpus arizonicus is a branching perennial subshrub up to 120 cm (48 inches) tall. The plant usually produces several flower heads, each head having yellow disc florets and white, purplish, yellow, or orange ray florets. Sometimes the ray florets are missing. The species grows in open sites along streams and in mountain canyons.^[5]

Varieties^{[3] [6]}

• Coreocarpus arizonicus var. arizonicus - Arizona, Sonora, Chihuahua, Baja California Sur
• Coreocarpus arizonicus var. filiformis (Greenm.) S.F.Blake - Sinaloa
• Coreocarpus arizonicus var. macrophyllus Sherff - Chihuahua
• Coreocarpus arizonicus var. pubescens (B.L.Rob. & Fernald) S.F.Blake - Sonora
• Coreocarpus arizonicus var. sanpedroensis (E.B.Sm.) B.L.Turner - Sonora

Notes and References

1. http://bonap.net/MapGallery/County/Coreocarpus%20arizonicus.png Biota of North America Program, 2013 county distribution map
2. Shreve, F. & I. L. Wiggins. 1964. Vegetation and Flora of the Sonoran Desert 2 vols. Stanford University Press, Stanford
3. https://www.biodiversitylibrary.org/page/8772390#page/378/mode/1up Blake, Sydney Fay 1913. Proceedings of the American Academy of Arts and Sciences 49: 344
4. Smith, Edwin Burnell 1985. American Journal of Botany 72(4): 626, as Coreocarpus sanpedroensis
5. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066414 Flora of North America, Coreocarpus arizonicus (A. Gray) S. F. Blake
6. http://swbiodiversity.org/seinet/taxa/index.php?taxon=3594 SEINet Southwest Biodiversity, Arizona Chapter, Coreocarpus arizonicus (A. Gray) Blake