Floris van Breugel / Trunks of Californian Redwood trees (Sequoia sempervirens) and blooming Rhododendron, Redwood National Park, Califorina, USA, June 2008.

Stephen Dalton / Red-banded / Rhododendron leafhopper {Graphocephala coccinea} pre-flight jump, UK

Wild Wonders of Europe / Zupanc / Rusty leaved alpenrose (Rhododendron ferrugineum) flower, Triglav National Park, Slovenia, July 2009

Inaki Relanzon / Estanys de la Pera / La Pera lakes, and Alpine rose (Rhododendron ferrugineum). La Cerdagna, Pyrenees, Catalonia, Spain. June 2006

Inaki Relanzon / Alpine rose (Rhododendron ferrugineum) with waterfall in the background, La Cerdagna, Pyrenees, Catalonia, Spain. June 2006

Wild Wonders of Europe / Benvie / Alpenrose (Rhododendron ferrugineum) in flower, Naturpark Kaunergrat, Tirol, Austria, July 2008

Wild Wonders of Europe / Popp / Mountain forest with flowering Rhododendron, Mtirala National Park, Georgia, May 2008

Wild Wonders of Europe / Popp / Old Beech tree (Fagus sp) with Rhododendron growing on it's trunk, Mtirala National Park, Georgia, May 2008 WWE BOOK PLATE.

Wild Wonders of Europe / Popp / Flowering Rhododendron in old growth forest, Borjomi Kharagauli National Park, Georgia, May 2008

Wild Wonders of Europe / Schandy / Caucasian rhododendron (Rhododendron caucasium) flowers with Mount Elbrus in the distance, Caucasus, Russia, June 2008 (Exclusive Japanese calendar rights for 2014)

Wild Wonders of Europe / Schandy / Caucasian rhododendron (Rhododendron caucasium) with Mount Elbrus in the distance, Caucasus, Russia, June 2008

Wild Wonders of Europe / Schandy / Caucasian rhododendron (Rhododendron caucasium) flowers with Mount Elbrus in the distance, Caucasus, Russia, June 2008

Wild Wonders of Europe / Schandy / Caucasian rhododendron (Rhododendron caucasium) flowers with Mount Elbrus in the distance, Caucasus, Russia, June 2008

Konstantin Mikhailov / Dombai-Ulgen peak with Rhododendron luteum plant, Teberdinskii reserve, NW Caucasus, Russia.

Michael Durham / Bumblebee (Bombus huntii) flying toward the camera after collecting nectar from a Rhododendron flower, northeast Oregon

Tim Fitzharris / Rhododendron (Rhododendron sp) flowers and Coast Redwood (Sequoia sempervirens) trees in fog, Redwood National Park, California

Jeff Foott / Pacific Rhododendron (Rhododendron macrophyllum) flowering in old growth Coast Redwood (Sequoia sempervirens) forest, Redwood National Park, California

Jack Dykinga / Old growth forest with flowering Rhododendron (Rhododendron macrophyllum) in front of trunks of Redwood trees (Sequoia sempervirens) with fog, Del Norte Coast Redwoods, California, USA.

Wayne Wu Ying / Wild Wonders of China / Rhodoendron flowering on cliff above river, Tangjiahe Nature Reserve, Sichuan, China.

Ashish & Shanthi Chandola / White collared blackbird (Turdus albocinctus) perched in Rhododendron (Rhododendron sp) tree. North Sikkim, India. April.

Ashish & Shanthi Chandola / Rhododendron (Rhododendron sp) flowering. North Sikki, India. April.

Lynn M. Stone / English springer spaniel standing in Rhododendron flowers, Connecticut, USA. June.

Lynn M. Stone / Doberman pinscher with cropped ears sitting in Rhododendron flowers, Connecticut, USA. May.

Linda Pitkin / Common Dog-violet (Viola riviniana) Rhododendron Wood, Leith Hill, Surrey, England, April.

Olga Kamenskaya / Rhododendron flowers (Rhododendron dauricum) Lake Baikal, Siberia, Russia. June.

Sandra Bartocha / Common rhododendron (Rhododendron ponticum) lined path, Semper Park , Ruegen, Germany, March.

Sandra Bartocha / Common rhododendron (Rhododendron ponticum) lined path, Semper Park , Ruegen, Germany, March.

Sandra Bartocha / Common rhododendron (Rhododendron ponticum) lined path, Semper Park , Ruegen, Germany, March.

Linda Pitkin / Opposite-leaved golden-saxifrage (Chryosplenium oppositifolium) Rhododendron wood, Leith Hill, Surrey, England, April.

Jean E. Roche / Rhododendron (Rhododendron ferrugineum) flowering on hillside, Champsaur, Ecrins National Park, France, June 2018.

Jean E. Roche / Rhododendron (Rhododendron ferrugineum) flowering on hillside, Champsaur, Ecrins National Park, France, June 2018.

Jean E. Roche / Rhododendron (Rhododendron ferrugineum) flowering on hillside, Champsaur, Ecrins National Park, France, June 2018.

Nigel Cattlin / Bud blast (Pycnostyzanus azaleae) disease on Rhododendron (Rhododendron sp) bud. In cultivation, Berkshire, England, UK. June.

Nigel Cattlin / Cushion scale insect (Pulvinaria floccifera) laying eggs on underside of cultivated Rhododendron (Rhododendron sp) leaf. In garden, Berkshire, England, UK. June.

Nigel Cattlin / Cushion scale insect (Pulvinaria floccifera) laying eggs on underside of cultivated Rhododendron (Rhododendron sp) leaf. In garden, Berkshire, England, UK. June.

Nigel Cattlin / Cushion scale insect (Pulvinaria floccifera) on underside of cultivated Rhododendron (Rhododendron sp) leaf. In garden, Berkshire, England, UK. June.

Nick Garbutt / Alpine rose (Rhododendron ferrugineum) near stream in mountain valley. Fiss, Landeck, North Tyrol, Austria. June 2017.

Nick Garbutt / Alpine rose (Rhododendron ferrugineum) flowering beside mountain stream. North Tyrol, Austria. June.

Heather Angel / Rhododendron (Rhododendron sp) flower, anthers and red stigma visible. Garden in Surrey, England, UK.

Heather Angel / Alpine rose (Rhododendron ferrugineum) in montane grassland above treeline. Giau Pass / Passo di giau, Dolomites, Italy. July 2011.

Heather Angel / Alpine rose (Rhododendron ferrugineum) in montane grassland above treeline. Giau Pass / Passo di giau, Dolomites, Italy. July 2011.

Heather Angel / Buff tailed bumblebee (Bombus terrestris) queen nectaring on Rhododendron (Rhododendron sp), pollen from anthers on backside and legs. Surrey, England, UK. March.

Heather Angel / Rhododendron (Rhododendron souliei) and Leopard plant (Ligularia sp) on bank of river flowing through forest. South of Kangding, Sichuan Province, China. June.

Heather Angel / Lichens on leaf litter beneath Rhododendron (Rhododendron phaeochrysum) tree. Kangding Cuo, Sichuan Province, China.

Heather Angel / Alexander's rhubarb (Rheum alexandrae) and Dwarf purple rhododendron (Rhododendron impeditum) in wet valley. Large bracts on rhubarb protect tiny flowers from UV rays. Near Lake Kangding Xian Cuo,...

Heather Angel / Alexander's rhubarb (Rheum alexandrae) and Dwarf purple rhododendron (Rhododendron impeditum) in wet valley with low cloud. Large bracts on rhubarb protect tiny flowers from UV light. Near Lake Ka...

Lynn M. Stone / English springer spaniel in Rhododendron. Haddam, Middlesex, Connecticut, USA.

Lynn M. Stone / Soft-coated wheaten terrier standing on rock with Rhododendron in background. Haddam, Connecticut, USA. June.