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Taxonomy:
Genus:
Rhododendron
Sub-genus:
Azaleastrum
Section
Azaleastrum (10 species)
Type Species:
R. Ovatum
Common Name:
Azalea
Native To:
CHN, TWN
Species:
R. hongkongense
Common Name:
Hong Kong Rhododendron
Native To:
Hong Kong
Section
Sciadorhodion (16 species)
Type Species:
R. Schlippenbachii
Common Name:
Royal Azalea
Native To:
KOR, PRK, CHN, JPN, E. RUS
Section
Tsutsusi (2 sub-sections, 81 species)
Type Species:
R. indicum
Native: JPN
Common Name:
Azalea Indica
Sub-genus
Choniastrum (20 species)
Species:
R. cavaleriei
Native To:
CHN, VNM
Species:
R. championiae
Common Name:
Champion′s Rhododendron
Species:
R. dayaoshanense
Native To:
CHN: Guangxi
Species:
R. feddei
Native To:
CHN: Guangxi
Species:
R. hancockii
Common Name:
Rhododendron Hankcockii
Native To:
ASI:SW, CHN, IDN
Species:
R. henryi
Native To:
CHN: Fujian, Guangdong, Guangxi, Jiangxi. TWN
Species:
R. huguangense
Native To:
CHN: Guangxu, Guangdong, Hunan
Species:
R. latoucheae
Native To:
CHN, TWN
Species:
R. longilobum
Native To:
CHN: Yunnan
Species:
R. mackenzianum
Native To:
CHN: Xizang, Yunnam. MMR
Species:
R. mitriforme
Native To:
CHN: Guangdong, Guangxi, Hunan
Species:
R. moulmainense
Common Name:
Westland′ Rhododendron
Native To:
CHN, HKG, IND, IDO, MYS, MMR, THA, VNM
Species:
R. stamineum
Native To:
CHN: Anhui, Guangdong, Guangxi, Hunan, Jiangxi.
Species:
R. subestipitatum
Native To:
CHN: Guangdong
Species:
R. taiense
Native To:
THA
Species:
R. taishunense
Native To:
CHN: Zhejiang
Species:
R. truncatoarum
Native To:
CHN: Yunnan
Species:
R. tutchrae
Native To:
CHN: Yunnan
Species:
R. vaniotii
Native To:
CHN: Guizhou
Species:
R. westlandii
Native To:
CHN: Guizhou
Sub-genus
Hymenanthes (225-270 species)
Section
Ponticum (24 sub-sections, 200 species)
Type Species:
R. Ponticum
Common Name:
Native To:
Section
Pentanthera (15 species)
Sub-section
Pentanthera
Deciduous Azaleas
Species:
R. alabamense
Common Name:
Alabama azalea
Native To:
USA: AL, GE, TN, FL
Species:
R. arborescens
Common Name:
sweet azalea, smooth azalea
Native To:
USA: PA to GA and AL
Species:
R. atlanticum
Common Name:
coastal azalea, dwarf azalea
Native To:
USA: GA to PA
Species:
R. austrinum
Common Name:
Florida flame azalea
Native To:
USA: NW-FL, SE-MS
Species:
calendulaceum
Common Name:
flame azalea
Native To:
USA: GA to PA
Species:
R. canescens
Common Name:
Piedmont azalea, Southern pinxter
Native To:
TX to FL and NC
Species:
R. cumberlandense
Common Name:
Cumberland azalea
Native To:
GA to KY
Species:
R. flammeum
Common Name:
Piedmont azalea, Oconee azalea
Native To:
GA, SC
Species:
R. luteum
Common Name:
Yellow azalea, Pontic azalea
Native To:
EUR: E, TUR, Caucasus
Species:
R. occidentale
Common Name:
Western azalae, Pacific azalea
Native To:
USA: CA to S-WA
Species:
periclymenoides
Common Name:
Pink azalea, Wild azalea
Native To:
USA: GA to New England, OH, TN
Species:
R. prinophyllum
Common Name:
Roseshell azalea, Early azalea
Native To:
CAN: QC. USA New England to VA, WV, OH, KY
Species:
R. prunifolium
Common Name:
Plumleaf azalea
Native To:
USA: GA, AL
Species:
R. viscosum
Common Name:
Clammy azalea, Swamp azalea
Native To:
New England to FL, then west to SE-TX
Sub-section
Sinensia
Deciduous Azaleas
Species:
R. molle
Common Name:
Chinese azalea, Molle azalea
Native To:
S-CHN, JPN
Species:
R. japonicum
Common Name:
Japanese azalea, Rengetsutsuji
Native To:
JPN
Section
Rhodora (2 species)
Species:
R. canadense
Common Name:
rhodora, Canada rosebay
Native To:
CAN: NL to USA: NJ
Species:
R. vaseyi
Common Name:
pinkshell azalea, vasey rhododendron
Native To:
USA: NC
Section
Sciadorhodion (4 species)
Species:
R. albrechtii
Common Name:
Albrecht′s azalea, Deep Mountain azalea
Native To:
JPN: Hokkaido, Honshu
Species:
R. pentaphyllum
Common Name:
fiveleaf azalea
Native To:
JPN: Honshu, Shikoku, Kyushr
Species:
R. quinquefolium
Common Name:
Cork Azalea, Shiroyashio
Native To:
JPN: N. Honshu to Shikoku
Species:
R. schlippenbachii
Common Name:
Royal azalea
Native To:
PKR, KOR, CHN: Manchuria, RUS: E
Section
Viscidula (1 species)
Species:
R. nipponicum
Common Name:
Nippon azalea, Oba-tsutsuji
Native To:
JPN: N.Honshu
Sub-genus
Rhododendron
Section
Pogonanthum (16 species)
Species:
R. Anthopogon, (2 Subspecies)
subsp. anthopogon
subsp. hypenanthum
Common Name:
Dwarf Rhododendron
Native To:
PAK, MMR, TIB and the Himalayas
Species:
R. anthopogonoides
Common Name:
rare
Native To:
CHN: Qinghai, Gansu
Species:
R. cephalanthum (2-Sub-species)
subsp. cephalanthum
subsp. platyphllum
Common Name:
flowering head
Native To:
CHN, TIB, MYA, Himalayas
Species:
R. collettianum
Common Name:
Collet′s azalea
Native To:
AFG, PAK
Species:
R. fragrans
Common Name:
rare hybrid
Native To:
Species:
kongboense
Common Name:
Kongbo rhododendron
Native To:
TIB: Xizang
Species:
R. laudandum
Common Name:
Mao guan du juan (hairy-corolla rhododendron)
Native To:
CHB: Tibet
Species:
R. primuliflorum
Common Name:
primrose-flowered rhododendron
Native To:
CHN: SE-Tibet, SW-Sichuan, NW-Yunnan
Species:
R. sargentianum
Common Name:
Sargent′s rhododendron
Native To:
CHN: Sichuan
Species:
R. trichostomum
Common Name:
hairy-mouthed rhododendron
Native To:
CHN: Sichuan, Yunnam
Section
Rhododendron (28 sub-sections, 179 species)
Sub-section
Afghanica (1 species)
Species:
R. afghanicum
Common Name:
Afghan rhododendron
Native To:
AFG, PAK
Sub-section
Baileya
Species:
R. baileyi
Common Name:
tall scaly rhododendron
Native To:
IND: Sikkim. BTN, CHN: Tibet
Sub-section
Boothia (7 species)
Sub-section
Camelliiflora (1 species)
Species:
R. camelliflorum
Sub-section
Campylogynum (1 species, 2 varieties)
Species:
R. campylogynum
Common Name:
bent-style rhododendron
Native To:
IND: NE, MYN: NE
Species Variety:
var. leucanthum
Species Variety:
var. eupodum
Sub-section
Caroliniana (1 species, 2 varieties)
Species:
R. minus
Common Name:
Piedmont Rhododendron
Native To:
USA: NC, SC, TN, GA, FL, AL
Species Variety:
R. minus, var. minus
Species Variety:
R. minus, var. champmanii
Sub-section
Cinnabarinum (1 species, 3 sub-species)
Species:
R. cinnabarunum
Common Name:
Cinnabar rhododendron
Native To:
Mountainous regions in IND, BTN, Tibet, NPL
Sub-section
Edgeworthia
Sub-section
Fragariflora
Sub-section
Genesieriana
Sub-section
Glauca
Sub-section
Heliolepida
Sub-section
Lapponica
Sub-section
Ledum
Sub-section
Lepidota
Sub-section
Maddenia
Sub-section
Micrantha
Sub-section
Monantha
Sub-section
Moupinensia
Sub-section
Rhododendron
Sub-section
Rhodorastra
Sub-section
Saluenensia
Sub-section
Scabrifolia
Sub-section
Tephropepia
Sub-section
Trichoclada
Sub-section
Triflora
Sub-section
Uniflora
Sub-section
Virgata
Section
Schistanthe
Sub-section
Pseudovireya
Section
Vireya (3 sub-section, 300 species)
Type Species:
R. javanicum.
Common Name:
Cepaka
Native To:
ASI: SE, THA, AUS
Sub-genus
Therorhodion (2 species)
Type Species:
R. camtschaticum
Common Name:
Kamchatka Rododendrum
Native To:
ASI:NE
Species:
R. redowskianum
Common Name:
Native To:
ASI
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