Tim Fitzharris / Redflower Currant (Ribes sanguineum) close up of bloom, North America

Tim Fitzharris / Indian Paintbrush (Castilleja coccinea) close up of bloom, North America

Tim Fitzharris / Grizzly Bear Cactus (Opuntia erinacea) and Peppergrass (Lepidium papilliferum) close up of bloom, North America

Tim Fitzharris / Mexican Hat (Ratibida columnifera) close up of petals, North America

Tim Fitzharris / Desert Chicory (Rafinesquia neomexicana) close up of bloom, North America

Tim Fitzharris / Opuntia (Opuntia sp) cactus blooming, North America

Tim Fitzharris / Opuntia (Opuntia sp) flowering, North America

Tim Fitzharris / Claret Cup Cactus (Echinocereus triglochidiatus) detail of flowers in bloom, North America

Tim Fitzharris / Claret Cup Cactus (Echinocereus triglochidiatus) detail of flowers in bloom, North America

Tim Fitzharris / Claret Cup Cactus (Echinocereus triglochidiatus) and Verbena (Verbena sp) detail of flowers in bloom, North America

Sumio Harada / Moss Campion (Silene acaulis) top view, Rocky Mountains, North America

Tim Fitzharris / Opuntia (Opuntia sp) in bloom, North America

Tim Fitzharris / Evening Primrose (Oenothera erythrosepala) with Grizzly Bear Cactus (Opuntia erinacea), North America

Michael & Patricia Fogden / Fishhook Barrel Cactus (Ferocactus wislizenii) flowering in the Sonoran Desert, North America

Tim Fitzharris / Brittlebush (Encelia farinosa) blooms with Convergent Lady Beetle (Hippodamia convergens), North America

Konrad Wothe / Engelmann Prickly Pear (Opuntia engelmannii) showing flower buds, Sonora Desert, North America