Hymenoxys ambigens explained

Hymenoxys ambigens is a species of flowering plant in the daisy family known by the common name Pinaleño Mountains rubberweed. It is native to the states of Arizona and New Mexico in the southwestern United States.^{[1] [2]}

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.^{[3] [4]}

Varieties^[3]

• Hymenoxys ambigens var. ambigens - Mescal, Pinaleño, and Santa Teresa Mountains in Arizona
• Hymenoxys ambigens var. floribunda (A.Gray) W.L.Wagner - Chiricahua, Dos Cabezas, Dragoon, Little Dragoon, and Mule Mountains in Arizona
• Hymenoxys ambigens var. neomexicana W. L. Wagner - Animas + Peloncillo Mountains in New Mexico

History

In 1882, Sarah Plummer Lemmon discovered the species. Harvard University botanist, Asa Gray, first described the species, naming it Plummera floribunda in her honor.^{[5] [6] [7]} Plummera was redefined as a subgenus of Hymenoxys in 1994.^[8]

Notes and References

1. http://bonap.net/MapGallery/County/Hymenoxys%20ambigens.png Biota of North America Program 2014 distribution map
2. http://swbiodiversity.org/seinet/taxa/index.php?taxon=2400&taxauthid=1 SEINet, Southwestern Biodiversity, Arizona chapter
3. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066983 Flora of North America, Hymenoxys ambigens (S. F. Blake) Bierner, 1994. Pinaleño Mountains rubberweed
4. https://www.biodiversitylibrary.org/page/39699118#page/338/mode/1up Blake, Sydney Fay 1929. Journal of the Washington Academy of Sciences 19(13): 276–278
5. News: Sara Plummer Lemmon: Pioneering Botanist JSTOR Daily. 2015-03-11. JSTOR Daily. en-US. 2016-12-13.
6. Book: Dupree, A. Hunter. Asa Gray, American Botanist, Friend of Darwin. Johns Hopkins University Press. 1988. 978-0-801-83741-8. Baltimore, MD. 389, 397–398.
7. Book: The Biographical Dictionary of Women in Science: L-Z. Ogilvie. Marilyn Bailey. Harvey. Joy Dorothy. Marilyn Bailey Ogilvie. Joy Harvey. 2000-01-01. Taylor & Francis. 9780415920407. en.
8. Bierner, Mark W 1994 SUBMERSION OF DUGALDIA AND PLUMMERA IN HYMENOXYS (ASTERACEAE: HELIANTHEAE: GAILLARDIINAE) Sida, Contributions To Botany Volume: 16:1-8