Plants — 23,508 Species

yellow-flowered rosebay

Rhododendron aureum Georgi

Rhododendron aureum is a flowering Rhododendron species whose foliage is eaten by Boloria freija larvae and produces four specific compounds.

Flame Azalea

Rhododendron calendulaceum (Michx.) Torr.

Rhododendron calendulaceum is a deciduous orange-flowered shrub native to the Appalachian Mountains of the eastern United States.

Kamchatka Rhododendron

Rhododendron camtschaticum Pall.

Rhodora

Rhododendron canadense (L.) Torr.

Rhododendron canadense is a low early-flowering shrub native to northeastern North America that grows in moist acidic habitats.

Mountain Azalea

Rhododendron canescens (Michx.) G.Don

Rhododendron canescens is a pink-blooming azalea native to parts of the Eastern United States, growing up to 5 meters tall.

Catawba Rhododendron

Rhododendron catawbiense Michx.

Rhododendron catawbiense is an eastern US native evergreen shrub cultivated as an ornamental for its spring violet-purple flowers.

Georgian Snow Rose

Rhododendron caucasicum Pall.

Rhododendron caucasicum, a native Transcaucasus and Anatolia flowering shrub, has a cultivar that won the RHS Award of Garden Merit.

Western Labrador Tea

Rhododendron columbianum (Piper) Harmaja

Rhododendron columbianum is an evergreen shrub with documented medicinal and insect-repelling uses, though it can be toxic if prepared incorrectly.

daurian rhododendron

Rhododendron dauricum L.

Rhododendron dauricum L. is a compact semi-evergreen flowering shrub widely grown in garden cultivation.

Rusty-leaved Alpenrose

Rhododendron ferrugineum L.

Rhododendron ferrugineum L. is a moderately toxic alpine shrub that bears pinkish-red summer flowers and grows on acidic siliceous soils.

Bog Labrador Tea

Rhododendron groenlandicum (Oeder) Kron & Judd

Rhododendron groenlandicum is a northern evergreen shrub with traditional uses, though it contains toxic alkaloids.

Hairy Alpenrose

Rhododendron hirsutum L.

Hairy alpenrose (Rhododendron hirsutum) is a European alpine Rhododendron that grows on carbonate-rich soils.

Lapland Azalea

Rhododendron lapponicum (L.) Wahlenb.

Rhododendron lapponicum is a small circumpolar evergreen subshrub native to arctic and alpine tundra regions.

Yellow Azalea

Rhododendron luteum Sweet

Rhododendron luteum, the yellow azalea, is a toxic cultivated flowering shrub native to southeast Europe and southwest Asia.

Pacific rhododendron

Rhododendron macrophyllum D.Don ex G.Don

Rhododendron macrophyllum is a Pacific Northwest evergreen pink-flowering shrub containing toxin that can poison honey.

great rhododendron

Rhododendron maximum L.

Rhododendron maximum L. (rosebay rhododendron) is a clonal evergreen shrub dominant in southern Appalachian forest understories, cultivated for horticulture.

mock azalea

Rhododendron menziesii Craven

Rhododendron menziesii Craven is a deciduous shrub native to northwestern North American mountain forests.

gorge rhododendron

Rhododendron minus Michx.

Piedmont rhododendron (Rhododendron minus Michx.) is a rhododendron species native to the southeastern United States that has two varieties.

western azalea

Rhododendron occidentale (Torr. & A.Gray) A.Gray

Rhododendron occidentale is a western North American deciduous shrub, valued for breeding hybrid garden azaleas.

Taiwan azalea

Rhododendron oldhamii Maxim.

Rhododendron oldhamii, commonly Taiwan azalea, is a toxic non-self-pollinating azalea native to Taiwan’s mountains.

Pinxter Flower

Rhododendron periclymenoides (Michx.) Shinners

Rhododendron periclymenoides is a toxic rhododendron native to eastern North America, pollinated by hummingbirds and butterflies.

minniebush

Rhododendron pilosum (Michx. ex Lam.) Craven

Minniebush, Rhododendron pilosum, is an Ericaceae shrub found in the Appalachian Mountains from southern Pennsylvania to Georgia.

Pontic Rhododendron

Rhododendron ponticum L.

Rhododendron ponticum L. is an evergreen shrub or small tree with ornamental cultivation, invasive status in Britain, and toxic mad honey properties.

false-gold-flower rhododendron

Rhododendron pseudochrysanthum Hayata

Rhododendron pseudochrysanthum is an evergreen flowering shrub native to Taiwan, often grown in UK gardens.