Jiri Lochman / Stromatolites, accretions of sedimentary grains formed by microbial mats, Hamelin Pool, Shark Bay UNESCO Natural World Heritage Site, Western Australia, Australia.

Shattil & Rozinski / Wyoming Paintbrush (Castilleja linariifolia) in flower, Wyoming, USA, North America

John Cancalosi / Redbud (Cercis canadensis) blossom in woodland, New York, USA

John Cancalosi / Redbud (Cercis canadensis) blossom in woodland, New York, USA

Tim Laman / White moss heather / western moss heather / white mountain heather (Cassiope mertensiana) in Toulumne Meadows, Yosemite National Park, California.

Shattil & Rozinski / Chisos prickly poppy {Argemone chisosensis} Big Bend NP, Texas, USA

Shattil & Rozinski / Narrowleaf globe mallow {Sphaeralcea angustifolia} Texas, USA

Shattil & Rozinski / Rock nettle {Eucnide bartonioides} flowers, Big Bend NP, Texas, USA

Shattil & Rozinski / Shooting star flowers {Primula pauciflora} USA

Shattil & Rozinski / Desert five spot {Malvastrum / Eremalche rotundifolia} flower, USA

Shattil & Rozinski / Nootka rose {Rosa nutkana} flower, USA

Juergen Freund / Mangrove tree and air roots split level (Rhizophoraceae) Florida Everglades, USA

Tom Vezo / Hedgehog cactus in flower {Echinocereus engelmanni} Arizona, USA