California Mason Bee
Bee / Megachilidae / Osmia / Osmia californica
Size
Seasonality
Conservation status
Pollinator preference
Pollen carrying method
Nesting
Sociality
2 confirmed and 698 likely
-
Likely
-
Confirmed
Cobweb Thistle
Cirsium occidentale
California Hedgenettle
Stachys bullata
Common Yarrow
Achillea millefolium
American Bird's-foot Trefoil
Acmispon americanus
Alfalfa
Medicago sativa
Plums & Prunes
Prunus
Cherries
Prunus
Plum-Apricot Hybrids
Prunus
Alternative names
-
Common Names:
California Mason Bee
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Spanish Common Names:
-
Scientific Names:
Osmia californica
Sources
iNaturalist Licensed Observation Images was accessed on March 27, 2025 from https://registry.opendata.aws/inaturalist-open-data.
Fowler, Jarrod. "Pollen Specialist Bees of the Western U.S." 2020. Accessed 19 Mar. 2025. https://jarrodfowler.com/pollen_specialist.html.
"Beginner Bee Field Guide." Colorado State University Extension, 28 Feb. 2022. Accessed 19 Mar. 2025. extension.colostate.edu/wp-content/uploads/2022/03/BeginnerBeeFieldGuide_LowRezWeb_28Feb2022.pdf. PDF.
NatureServe. 2025. NatureServe Network Biodiversity Location Data accessed through NatureServe Explorer [web application]. NatureServe, Arlington, Virginia. Available https://explore