What is "hymenoxys"

Hymenoxys (rubberweed or bitterweed) is a genus of plants in the sunflower family, native to North and South America. 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.

1. Hymenoxys ambigens - Pinaleno Mountain rubberweed - Arizona New Mexico
2. Hymenoxys anthemoides - Rio Grande do Sul, Rio de Janeiro, Paraguay, Uruguay, Argentina
3. Hymenoxys biennis - Utah
4. Hymenoxys bigelovii - Utah Arizona New Mexico
5. Hymenoxys brachyactis - East View rubberweed - New Mexico
6. Hymenoxys brandegeei - Arizona New Mexico Colorado
7. Hymenoxys cabrerae - Argentina
8. Hymenoxys californica - California, Baja California
9. Hymenoxys chrysanthemoides - San Luis Potosí, Veracruz, Zacatecas, México State, Puebla, Oaxaca, Hidalgo
10. Hymenoxys cooperi - Cooper's rubberweed - California Nevada Arizona Utah Idaho Oregon New Mexico
11. Hymenoxys grandiflora - New Mexico Colorado Wyoming Montana Utah Idaho
12. Hymenoxys helenioides - intermountain rubberweed - Arizona New Mexico Colorado Utah
13. Hymenoxys hoopesii - owl claws - New Mexico Colorado Wyoming Montana Utah Idaho Oregon Nevada California
14. Hymenoxys insignis - Nuevo León, Coahuila, Chihuahua
15. Hymenoxys jamesii - Arizona
16. Hymenoxys lemmonii - Lemmon's rubberweed - Arizona Oregon Nevada California
17. Hymenoxys multiflora - Texas New Mexico
18. Hymenoxys mutica - California
19. 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
20. Hymenoxys quinquesquamata - rincon rubberweed - Arizona New Mexico
21. Hymenoxys richardsonii - pingue rubberweed, Colorado rubberweed - Alberta, Saskatchewan, Montana Idaho Wyoming Utah Colorado New Mexico Arizona Texas Nebraska North Dakota Nevada
22. Hymenoxys robusta - Bolivia, Argentina, Peru
23. Hymenoxys rusbyi - Arizona New Mexico
24. Hymenoxys subintegra - Arizona rubberweed - Arizona Utah
25. Hymenoxys texana - prairie dawn - Texas
26. Hymenoxys tweediei - Argentina
27. Hymenoxys vaseyi - Texas New Mexico