Calflora, a 501c3 non-profit
Distribution by County   4213    
Holodiscus microphyllus  Rydb.  var. glabrescens  (Greenm.) F. A. Ley

(not an active name)
Desert ocean spray, Rock spiraea
Holodiscus microphyllus var. glabrescens is a shrub that is native to California, and also found elsewhere in western North America.
Record Count by County

Alameda: 73 Lake: 26 Plumas: 44 Solano: 7
Alpine: 45 Lassen: 27 Riverside: 25 Sonoma: 125
Amador: 9 Los Angeles: 71 San Benito: 42 Stanislaus: 1
Butte: 21 Madera: 8 San Bernardino: 71 Sutter: 5
Calaveras: 2 Marin: 278 San Diego: 13 Tehama: 23
Colusa: 3 Mariposa: 26 San Francisco: 13 Trinity: 76
Contra Costa: 66 Mendocino: 77 San Luis Obispo: 96 Tulare: 33
Del Norte: 154 Modoc: 26 San Mateo: 236 Tuolumne: 36
El Dorado: 47 Mono: 112 Santa Barbara: 62 Ventura: 38
Fresno: 27 Monterey: 105 Santa Clara: 87 Yolo: 2
Glenn: 6 Napa: 18 Santa Cruz: 35 Yuba: 2
Humboldt: 144 Nevada: 30 Shasta: 67
Inyo: 106 Orange: 32 Sierra: 16
Kern: 14 Placer: 41 Siskiyou: 162

Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2026. The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 03/16/2026).