Hymenoxys (rubberweed or bitterweed) is a genus of plants in the sunflower family, native to North and South America.Cassini, Alexandre Henri Gabriel de, in Cuvier, F. 1828. Dictionnaire des Sciences Naturelles [Second edition] 55: 278–279in FrenchTropicos, Hymenoxys Cass.Flora of North America, Bitterweed, rubberweed, Hymenoxys Cassini 1828. It was named by Alexandre Henri Gabriel de Cassini in 1828.
Plants of this genus are toxic to sheep due to the presence of the sesquiterpene lactone hymenoxon. Pfeiffer, F. A. and M. C. Calhoun. (1987). Effects of environmental, site, and phenological factors on hymenoxon content of bitterweed, Hymenoxys odorata. Journal of Animal Science 65 1553-62.Texas A&M University, Toxicity: H. odorata
SpeciesBiota of North America Program 2013 county distribution mapsTurner, B. L. 2013. The comps of Mexico. A systematic account of the family Asteraceae (chapter 11: tribe Helenieae). Phytologia Memoirs 16: 1–100.The Plant List search for HymenoxysThe Plant List, search for Hymenoxys Hymenoxys ambigens - Pinaleno Mountain rubberweed - Arizona New Mexico Hymenoxys anthemoides - Rio Grande do Sul, Rio de Janeiro, Paraguay, Uruguay, Argentina Hymenoxys biennis - Utah Hymenoxys bigelovii - Utah Arizona New Mexico Hymenoxys brachyactis - East View rubberweed - New Mexico Hymenoxys brandegeei - Arizona New Mexico Colorado Hymenoxys cabrerae - Argentina Hymenoxys californica - California, Baja California Hymenoxys chrysanthemoides - San Luis Potosí, Veracruz, Zacatecas, México State, Puebla, Oaxaca, Hidalgo Hymenoxys cooperi - Cooper's rubberweed - California Nevada Arizona Utah Idaho Oregon New Mexico Hymenoxys grandiflora - New Mexico Colorado Wyoming Montana Utah Idaho Hymenoxys helenioides - intermountain rubberweed - Arizona New Mexico Colorado Utah Hymenoxys hoopesii - owl claws - New Mexico Colorado Wyoming Montana Utah Idaho Oregon Nevada California Hymenoxys insignis - Nuevo León, Coahuila, Chihuahua Hymenoxys jamesii - Arizona Hymenoxys lemmonii - Lemmon's rubberweed - Arizona Oregon Nevada California Hymenoxys multiflora - Texas New Mexico Hymenoxys mutica - California Hymenoxys odorata - bitter rubberweed - California Arizona New Mexico Texas Oklahoma Colorado Kansas Maine South Carolina Alabama, Baja California, Baja California Sur, Sonora, Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Tamaulipas Hymenoxys quinquesquamata - rincon rubberweed - Arizona New Mexico Hymenoxys richardsonii - pingue rubberweed, Colorado rubberweed - Alberta, Saskatchewan, Montana Idaho Wyoming Utah Colorado New Mexico Arizona Texas Nebraska North Dakota Nevada Hymenoxys robusta - Bolivia, Argentina, Peru Hymenoxys rusbyi - Arizona New Mexico Hymenoxys subintegra - Arizona rubberweed - Arizona Utah Hymenoxys texana - prairie dawn - Texas Hymenoxys tweediei - Argentina Hymenoxys vaseyi - Texas New Mexico
formerly included
References
External links Jepson Manual Treatment, University of California United States Department of Agriculture Plants Profile