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1
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  Species 
alabamense
Rehd.
 common name: 
Alabama azalea
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2
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  Species 
albiflorum
Hook.
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3
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  Varietas 
albiflorum
 common name: 
Cascade azalea
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4
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  Varietas 
warrenii
(A. Nels.) M.A. Lane
 common name: 
Cascade azalea
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5
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6
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  Varietas 
richardsonii
Rehd.
 syn. Rhododendron arborescens
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7
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  Species 
ashleyi
Coker
 syn. Rhododendron maximum
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8
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  Species 
atlanticum
(Ashe) Rehd.
 common name: 
dwarf azalea
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9
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  Species 
austrinum
(Small) Rehd.
 common name: 
orange azalea
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10
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  Species 
bakeri
auct. non (Lemmon & McKay) Hume
 syn. Rhododendron cumberlandense
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11
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  Species 
calendulaceum
(Michx.) Torr.
 common name: 
flame azalea
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12
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  Species 
californicum
Hook.
 syn. Rhododendron macrophyllum
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13
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  Species 
camtschaticum
Pallas
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14
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  Subspecies 
camtschaticum
 common name: 
Kamchatka rhododendron
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15
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  Subspecies 
glandulosum
(Standl.) Hult�n
 common name: 
Kamchatka rhododendron
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16
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  Species 
canadense
(L.) Torr.
 common name: 
rhododendron
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17
 | 
 
  
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  Species 
candidum
(Small) Rehd.
 syn. Rhododendron canescens
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18
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  Species 
canescens
(Michx.) Sweet
 common name: 
mountain azelea
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19
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  Varietas 
candidum
(Small) Rehd.
 syn. Rhododendron canescens
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20
 | 
 
  
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  Varietas 
subglabrum
Rehd.
 syn. Rhododendron canescens
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21
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  Species 
carolinianum
Rehd.
 common name: 
Carolina azalea
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| 
22
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  Species 
catawbiense
Michx.
 common name: 
Catawba rosebay
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| 
23
 | 
 
  
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  Species 
chapmanii
Gray
 common name: 
Chapman's rhododendron
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| 
24
 | 
 
  
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  Species 
coryi
Shinners
 syn. Rhododendron viscosum
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| 
25
 | 
 
  
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  Species 
cumberlandense
E.L. Braun
 common name: 
Cumberland rhododendron
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26
 | 
 
  
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  Species 
flammeum
(Michx.) Sarg.
 common name: 
piedmont azalea
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| 
27
 | 
 
  
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  Species 
groenlandicum
(Oeder) Kron & Judd
 syn. Ledum groenlandicum
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| 
28
 | 
 
  
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  Species 
japonicum
(Gray) Sur.
 common name: 
Japanese azalea
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29
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  Species 
lapponicum
(L.) Wahlenb.
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| 
30
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  Varietas 
lapponicum
 common name: 
Lapland rosebay
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| 
31
 | 
 
  
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  Varietas 
parvifolium
(M.F. Adams) Herder
 common name: 
Lapland rosebay
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| 
32
 | 
 
  
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  Species 
macrophyllum
D. Don ex G. Don
 common name: 
Pacific rhododendron
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| 
33
 | 
 
  
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  Species 
maximum
L.
 common name: 
great laurel, rhododendron
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| 
34
 | 
 
  
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  Species 
minus
Michx.
 common name: 
Piedmont rhododendron
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| 
35
 | 
 
  
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  Varietas 
chapmanii
(Gray) Duncan & Pullen
 syn. Rhododendron chapmanii
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| 
36
 | 
 
  
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  Species 
nudiflorum
(L.) Torr.
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| 
37
 | 
 
  
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  Varietas 
glandiferum
(Porter) Rehd.
 syn. Rhododendron periclymenoides
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| 
38
 | 
 
  
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  Varietas 
roseum
(Loisel.) Wieg.
 syn. Rhododendron prinophyllum
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39
 | 
 
  
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  Species 
oblongifolium
(Small) Millais
 common name: 
Texas azalea
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40
 | 
 
  
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  Species 
occidentale
(Torr. & Gray ex Torr.) Gray
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41
 | 
 
  
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  Varietas 
occidentale
 common name: 
western azalea
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| 
42
 | 
 
  
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  Varietas 
paludosum
Jepson
 common name: 
western azalea
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| 
43
 | 
 
  
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  Varietas 
sonomense
(Greene) Rehd.
 common name: 
Sonoma azalea
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| 
44
 | 
 
  
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  Species 
periclymenoides
(Michx.) Shinners
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45
 | 
 
  
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  Varietas 
eglandulosum
Seymour
 syn. Rhododendron periclymenoides
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| 
46
 | 
 
  
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  Species 
prinophyllum
(Small) Millais
 common name: 
early azalea
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47
 | 
 
  
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  Species 
prunifolium
(Small) Millais
 common name: 
plumleaf azalea
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48
 | 
 
  
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  Species 
roseum
(Loisel.) Rehd.
 syn. Rhododendron prinophyllum
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49
 | 
 
  
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  Species 
serrulatum
(Small) Millais
 syn. Rhododendron viscosum
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50
 | 
 
  
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  Species 
speciosum
(Willd.) Sweet
 syn. Rhododendron flammeum
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51
 | 
 
  
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  Species 
tomentosum
(Stokes) Harmaja
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52
 | 
 
  
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  Subspecies 
subarcticum
(Harmaja) G. Wallace
 syn. Ledum palustre ssp. decumbens
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53
 | 
 
  
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  Species 
vaseyi
Gray
 common name: 
pinkshell azalea
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54
 | 
 
  
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  Species 
viscosum
(L.) Torr.
 common name: 
swamp azalea
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55
 | 
 
  
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  Varietas 
aemulans
Rehd.
 syn. Rhododendron viscosum
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| 
56
 | 
 
  
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  Varietas 
glaucum
(Michx.) Gray
 syn. Rhododendron viscosum
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 | 
 
 
 | 
 
| 
57
 | 
 
  
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  Varietas 
montanum
Rehd.
 syn. Rhododendron viscosum
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 | 
 
| 
58
 | 
 
  
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  Varietas 
nitidum
(Pursh) Gray
 syn. Rhododendron viscosum
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| 
59
 | 
 
  
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  Varietas 
serrulatum
(Small) Ahles
 syn. Rhododendron viscosum
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| 
60
 | 
 
  
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  Varietas 
tomentosum
Rehd.
 syn. Rhododendron viscosum
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 | 
 
 
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| 
61
 | 
 
  
 | 
  Species 
x bakeri
(Lemmon & McKay) Hume (pro sp.)
 | 
 | 
 
 
 | 
| 
62
 | 
 
  
 | 
  Species 
x pennsylvanicum
Rehd.
 | 
 | 
 
 
 | 
| 
63
 | 
 
  
 | 
  Species 
x welleslyanum
Waterer ex Rehd.
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