Calycadenia multiglandulosa

Rosin weed

Family: Asteraceae · Type: annual · Native

Rosin weed is a California native annual found in northern Coast Ranges, Sierra Nevada, Central Valley, San Francisco Bay Area, and south coastal regions in dry, open valleys, hillsides, and rocky ridges at elevations of 50 to 1,100 meters. Flowering from May to October, this plant produces white to cream or rose-colored flowers with ray flowers 5 to 10 millimeters long, featuring asymmetric lateral lobes. Growing with stems 10 to 70 centimeters tall, often branched and covered in glandular hairs, particularly towards the upper portions. Its leaves are generally alternate, ranging 3 to 8 centimeters long, with lower leaves often persisting throughout the plant's life cycle. The inflorescence forms spike-like clusters with distinctive red-tinted linear bracts and multiple flower heads featuring 2 to 6 ray flowers and 4 to 20 disk flowers.

Habitat: Common. Generally dry, open valleys, hillsides, rocky ridges

Bloom period: May-Oct

Elevation: 50-1100 m

Bioregions: NCoR, SN, GV, SnFrB, SCoRI.

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Jepson eFlora, Cal-IPC, and more.