Hymenoxys

Taxobox
name = "Hymenoxys"

---

image_width = 250px
image_caption = "Hymenoxys acaulis" syn. "Gaillardia acaulis"
regnum = Plantae
divisio = Magnoliophyta
classis = Magnoliopsida
ordo = Asterales
familia = Asteraceae
genus = "Hymenoxys"
genus_authority = Cass.
subdivision_ranks = Species
subdivision = See text.

"Hymenoxys" (Rubberweed or Bitterweed) is a genus of the botanical family Asteraceae. Plants of this genus are toxic to sheep due to the presence of the sesquiterpene lactone hymenoxon. There are 28 species.

Species include:
*"Hymenoxys ambigens" - Pinaleno Mountain rubberweed
*"Hymenoxys brachyactis" - East View rubberweed
*"Hymenoxys cooperi" - Cooper's rubberweed
*"Hymenoxys helenioides" - intermountain rubberweed
*"Hymenoxys hoopesii" - owl claws
*"Hymenoxys lemmonii" - Lemmon's rubberweed
*"Hymenoxys odorata" - bitter rubberweed
*"Hymenoxys quinquesquamata" - rincon rubberweed
*"Hymenoxys richardsonii" - pingue rubberweed, Colorado rubberweed
*"Hymenoxys subintegra" - Arizona rubberweed
*"Hymenoxys texana" - prairie dawn

External links

* [http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?609,1441 Jepson Manual Treatment]
* [http://plants.usda.gov/java/profile?symbol=HYMEN7 USDA Plants Profile]
* [http://texnat.tamu.edu/cmplants/toxic/plants/westernbitterweed.html Toxicity: "H. odorata"]

Further reading

* ISBN 0-89672-614-2
*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.