Volume 12, Issue 4 (1990)This issue of Volume 12 was published 22nd March, 1990.
The Genera of Asteraceae Endemic to Mexico and Adjacent Regions
Jose Luis Villaseñor
Monardella Stebbinsii (Lamiaceae), A New Serpentine Endemic Species from the Northern Sierra Nevada, Plumas County, California
Clare B. Hardham and Jim A. Bartel
Dudleya Cymosa Subsp. Costafolia (Crassulaceae), A New Subspecies from the Southern Sierra Nevada, Tulare County, California
Jim A. Bartel and James R. Shevock