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It is the type species for the Tsutsusi section and subsection, and was the original Tsutsusi described by Engelbert Kaempfer in Japan in 1712, [5] from the Japanese name Kirishima-tsutsuji. Cultivation
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.
Tsutsusi comes from the Japanese word for Azalea, Tsutsuji ( つつじ or ツツジ). When Don (1834) described the subdivisions of Rhododendron he named one of his eight sections, Tsutsutsi (sic), which he explained was the Chinese name of the first species described ( R. indicum , originally Azalea indica L.). [ 8 ]
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 ...
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.
western azalea; Pacific azalea Ericaceae (heath family) Rhododendron periclymenoides: pinxterbloom azalea Ericaceae (heath family) Rhododendron ponticum: Pontic rhododendron Ericaceae (heath family) Vaccinium: blueberries, cranberries, and sparkleberries; Vaccinium arboreum: sparkleberry; farkleberry Ericaceae (heath family) Vaccinium corymbosum
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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 .