Life … Animals Arthropods Insects Hymenopterans Mason, Leafcutter, Carder, and Resin Bees Mason Bees Melanosmia Osmia regulina species 4 observations Osmia regulina Osmia regulina Supported by All 7 native plantssupport it in the US Nectar plants Plants whose flowers it visits Hooker's Onion, Orange Bush Monkeyflower, Silverleaf Phacelia, Branching Phacelia 7 Close