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Most are in the United States, with one species found in Canada and one being found in Mexico. North American azaleas are commonly confused with azaleas of Asian origin, the evergreen azaleas. North American azaleas are deciduous and produce two types of buds. One is a larger and produces about 20 flowers while the other bud produces a leafy ...
Two subgenera are generally known to gardeners as "Azaleas", and include many fewer true species: Pentanthera, which comprises the deciduous azaleas, and Tsutsusi, which includes evergreen azaleas. [3] Modern cladistic analysis, based on nuclear genetics, proposes changes in the classification of species within subgenera.
Rhododendron calendulaceum, the flame azalea, [3] is a species of Rhododendron. It is a deciduous shrub that grows up to 120–450 cm tall. This species of Rhododendron is native to the Appalachian Mountains in the eastern United States, ranging from southern Pennsylvania and Ohio to northern Georgia. It may be extirpated from Pennsylvania and ...
Azalea leafy gall can be particularly destructive to azalea leaves during the early spring. Hand picking infected leaves is the recommended method of control. [4] They can also be subject to Phytophthora root rot in moist, hot conditions. [5] Azaleas share the economically important disease Phytophthora cinnamomi with more than 3000 other plants.
Rhododendron periclymenoides, the pink azalea [1] or pinxter flower, is a species of shrub in the heath family Ericaceae. It is native to eastern North America, where it is widespread from Alabama to New Hampshire. [2] It is often found in riparian areas, in wet to dry forests. [3] This species produces showy pink flowers in the spring.
Rhododendron occidentale, the western azalea [1] or California azalea, is one of two deciduous Rhododendron species native to western North America (the other is Rhododendron albiflorum). The western azalea is known to occur as far north as Lincoln and Douglas Counties in Oregon and as far south as the mountains of San Diego county.
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