Rolf Nussbaumer / Solitary bee, adult perched on Mexican hat (Ratibida columnifera) Dinero, Lake Corpus Christi, South Texas, USA.

Claudio Contreras / Mexican hat (Ratibida columnifera) flowers, Laredo Borderlands, Texas, USA. April

Claudio Contreras / Mexican hat (Ratibida columnifera) flowers along lakeside path, Laredo Borderlands, Texas, USA. April

Jim Brandenburg / Prairie Coneflower (Ratibida pinnata) flowers

Matthias Breiter / Mexican Hat (Ratibida columnifera) flowers, Spruce Woods Provincial Park, Manitoba, Canada

Larry Michael / Prairie coneflower {Ratibida pinnata} with cobweb over flowers, USA

Rolf Nussbaumer / Digger Bee {Anthophorinae}, adult on Mexican Hat flower (Ratibida columnaris) Rio Grande Valley, Texas, USA, May

Tim Fitzharris / Mexican Hat (Ratibida columnifera) flowers in bloom, North America

Tim Fitzharris / Mexican Hat (Ratibida columnifera) flowers in bloom, North America

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

Rolf Nussbaumer / Bee {Apoidea} feeding on Mexican Hat flower (Ratibida columnaris) Hill Country, Texas, USA

Rolf Nussbaumer / Mexican Hat {Ratibida columnifera} flower, Texas, USA