Hymenoxys
Encyclopedia
Hymenoxys 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:
Botany
Botany, plant science, or plant biology is a branch of biology that involves the scientific study of plant life. Traditionally, botany also included the study of fungi, algae and viruses...
family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...
Asteraceae
Asteraceae
The Asteraceae or Compositae , is an exceedingly large and widespread family of vascular plants. The group has more than 22,750 currently accepted species, spread across 1620 genera and 12 subfamilies...
. Plants of this genus are toxic to sheep due to the presence of the sesquiterpene
Sesquiterpene
Sesquiterpenes are a class of terpenes that consist of three isoprene units and have the molecular formula C15H24. Like monoterpenes, sesquiterpenes may be acyclic or contain rings, including many unique combinations...
lactone
Lactone
In chemistry, a lactone is a cyclic ester which can be seen as the condensation product of an alcohol group -OH and a carboxylic acid group -COOH in the same molecule...
hymenoxon. There are 28 species.
Species include:
- Hymenoxys acaulis - stemless hymenoxys
- Hymenoxys ambigens - Pinaleno Mountain rubberweed
- Hymenoxys brachyactis - East View rubberweed
- Hymenoxys cooperiHymenoxys cooperiHymenoxys cooperi is a species of flowering plant in the daisy family known by the common name Cooper's rubberweed. It is native to the southwestern United States and Great Basin, where it grows in rocky soils in arid regions. This is a biennial or perennial herb with a branching stem growing erect...
- Cooper's rubberweed - Hymenoxys helenioides - intermountain rubberweed
- Hymenoxys herbacea - lakeside daisy
- Hymenoxys hoopesiiHymenoxys hoopesiiHymenoxys hoopesii is a species of flowering plant in the daisy family known by the common names owl's claws and orange sneezeweed. It is native to the western United States, where it grows in habitats of moderate elevation, such as mountain meadows...
- owl claws - Hymenoxys lemmoniiHymenoxys lemmoniiHymenoxys lemmonii is a species of flowering plant in the daisy family known by the common name Lemmon's rubberweed. It is native to the western United States in and around the Great Basin. This is a biennial or perennial herb with one or more branching stems growing erect to a maximum height near...
- Lemmon's rubberweed - Hymenoxys odorataHymenoxys odorataHymenoxys odorata is a species of flowering plant in the daisy family known by the common names bitter rubberweed and western bitterweed. It is native to the southwestern United States from California to Texas and northern Mexico, where it grows in dry regions. This is an annual herb producing a...
- bitter rubberweed - Hymenoxys quinquesquamata - rincon rubberweed
- Hymenoxys richardsonii - pingue rubberweed, Colorado rubberweed
- Hymenoxys subintegra - Arizona rubberweed
- Hymenoxys texanaHymenoxys texanaHymenoxys texana is a rare species of flowering plant in the aster family known by the common names prairie dawn, Texas prairie dawn-flower, and Texas bitterweed. It is endemic to Texas, where it is known only from the general vicinity of Houston. It is threatened by the loss of its habitat...
- prairie dawn
External links
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.