United States, California, San Diego, Southern Santa Ana Moutains, San Mateo Canyon Wilderness Area. Northwestwern summit and slopes of Miller Mountain.
T7S R5W S34 N1/2 S1/4 SW1/4
[also] T8S R5W S10 N1/2 NW1/4
793-884 meters
2600-2900ft.
Mostly clay soils derived from volcanic substrates. Vegetation of a mosaic of native grassland, Quercus agrifolia woodland and chaparral dominated by Adenostoma fasciculatum, and Ceanothus crassifolius.
Shrub apparently with basal burl. Leaves, stems, and inflorescences glabrous. Fruit with a small, solid stone.