Hymenoxys rusbyi, Rusby's Rubberweed
Scientific Name: Hymenoxys rusbyi
Common Name: Rusby's Rubberweed
Family: Asteraceae, Sunflower Family
Synonyms: (Actinella rusbyi)
Size: 1 to 4 feet or more.
Growth Form: Forb/herb; woody; numerous branches upper end of plant; plants smooth or hairy.
Leaves: Green leaves; simple or pinnately lobed; upper leaves 3 lobed.
Flower Color: Yellow; radiate heads; ray flowers widely linear; 6 to 8, disk florets numerous; fruit is an achene.
Flowering Season: July to September.
Elevation: 5,500 to 7,000 feet.
Habitat Preferences: Higher elevations in dry soil, open areas in pinyon juniper communities, roadsides and rocky slopes.
Recorded Range: Rare in the United States, distribution is limited to Arizona and New Mexico. In Arizona Rusby's Rubberweed is found in the northern and northwestern parts of the state and in Gila County. In New Mexico its occurrence is in the southeastern part of the state.
U.S. Weed Information: No data available.
Invasive/Noxious Weed Information: No data available.
Wetland Indicator: No data available.
Threatened/Endangered Information: No data available.
Comments: Although rare in the United States Rusby’s Rubberweed in locally common where found above 5,500 feet in Arizona. These photographs were taken of a lone roadside specimen near in the Mazatzal Mountains off of Highway 87 near Mount Ord, Tonto National Forest.
This species is similar to and may be mistaken for the somewhat smaller Pingue Rubberweed, Hymenoxys richardsonii which has a much larger distribution.