Hymenoxys rusbyi is a North American species of flowering plant in the daisy family known by the common names Rusby's rubberweed or Rusby's bitterweed. It has been found only in the states of Arizona and New Mexico in the southwestern United States.Biota of North America Program 2014 distribution mapSEINet, Southwestern Biodiversity, Arizona chapter photos, distribution map, description
Hymenoxys rusbyi grows in open areas, generally at the edges of pine-oak forests at elevations of . It is a perennial herb up to tall. One plant can produce sometimes as many as 250 flower heads in a branching, flat-topped array. Each head has 6–8 yellow ray flowers and 25–50 tiny yellow disc flowers.Flora of North America, Hymenoxys rusbyi (A. Gray) Cockerell, 1904. Rusby’s rubberweed or bitterweed Cockerell, Theodore Dru Alison 1904. Bulletin of the Torrey Botanical Club 31(9): 496-497
References
External links Photo of herbarium specimen at Missouri Botanical Garden, collected in New Mexico in 1881