| Rhododendron species | common name | flower color | fragrance | USDA zone | bloom | |
|---|---|---|---|---|---|---|
| R. alabamense | Alabama azalea | white, pink | lemon-scented | 6-8 | late May |
)
|
| R. arborescens | smooth, sweet azalea | white, pink | heliotrope-like | 5-8 | mid to late June |
)
|
| R. atlanticum | coast, dwarf azalea | white | sugary sweet | 6-8 | mid May |
)
|
| R. austrinum | Florida, orange azalea | yellow-orange | sweet, fruity | 6-9 | mid May |
)
|
| R. calendulaceum | flame azalea | yellow, orange, red | none | 6-7 | mid June |
)
|
| R. canadense | rhodora | pink to rose-purple | none | 4-6 | late Apr, early May | |
| R. canadense f. albiflorum | rhodora | white | none | 4-6 | late Apr, early May |
)
|
| R. canescens | Piedmont azalea | light pink, white | delicate sweet | 6-8 | early to mid May | |
| R. cumberlandense¹ | Cumberland, Bakers azalea | yellow to red-orange | none | 6-8 | mid June |
)
|
| R. eastmanii² | Eastman azalea | white | fragrant | n/a | May | |
| R. flammeum³ | Oconee, Piedmont azalea | scarlet, red, orange | none | 6-8 | May | |
| R. occidentale³ | western azalea | white-pink to orange | fragrant | 6 | May to June | |
| R. periclymenoides | pinxterbloom azalea | pink, white | faint to none | 6-8 | mid May |
)
|
| R. prinophyllum | roseshell, election pink azalea | pink, rose | clove-like | 5-7 | May |
)
|
| R. prunifolium | plumleaf azalea | brick red to orange | none | 6-8 | mid to late July |
)
|
| R. vaseyi | pinkshell azalea | pink, white | none | 5-7 | early to mid May |
)
|
| R. viscosum4 | swamp azalea | white to pink | spicy sweet | 5-8 | early to mid July |
)
|
1formerly R. bakeri
2new species, insufficient current data
3not represented in Highstead's collection
4includes R. oblongifolium, Texas azalea, and R. serrulatum, sweet azalea