The Genus Isocoma
Goldenweed
Family: Asteraceae
Shrubs usually about 2-3’ tall with very nectar rich, golden flowers occurring in fall. Flowers are followed by floofy material with seeds. Though the plants can look unruly when not flowering, they are fantastic when in bloom and an important wildlife plant.
Plant in full to part sun, low water when established. Most species hardy to at least 10°F.
This is an important fall blooming nectar source for numerous butterflies, bees, and other pollinators. Larval host for the Gumweed Plume Moth (Dejongia californicus), the snout moth Diastictis sperryorum, the American Sunflower Moth (Homoeosoma electella), and the Snakeweed Borer Moth (Pelochrista ridingsana).
Important medicinal plant (used internally and externally) where the genus occurs.
There are 15 species of Isocoma found in the semi-arid areas of Southwestern United States and Mexico. The name of this genus is derived from the Greek for "equal hair" referring to the pappus on the seed.
Burroweed (Isocoma tenuisecta) is the most common species found around Tucson and Phoenix. Naturally found on dry slopes, mesas, and alluvial plains from 2,000-5,500'. Photo by Liz Makings, SEINET
Rusby's Goldenweed (Isocoma rusbyi) is found in deserts, pinyon-juniper, and chaparral vegetation from 2500-5000'. photo by Max Licher, SEINET
Alkali Goldenweed (Isocoma acradenia) is found on desert slopes, hillsides, and plains below 4,000', photo by Max Licher, SEINET