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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.
The following is a list of rhododendron cultivars and species which have gained the Royal Horticultural Society's Award of Garden Merit.They are mostly hardy evergreen shrubs with abundant, brilliantly-coloured, trumpet-shaped flowers, often in large spherical trusses.
Rhododendron maximum is a species of Rhododendron native to the Appalachians of eastern North America, from Alabama north to coastal Nova Scotia. Its common names include great laurel , [ 2 ] great rhododendron , rosebay rhododendron , American rhododendron and big rhododendron .
Like other ericaceous plants, most rhododendrons prefer acid soils with a pH of roughly 4.5–5.5; some tropical Vireyas and a few other rhododendron species grow as epiphytes and require a planting mix similar to orchids. Rhododendrons have fibrous roots and prefer well-drained soils high in organic material.
Rhododendron occidentale is a shrub growing to 5 m tall. The leaves are deciduous, 3–9 cm long and 1–3 cm broad.The flowers are 3.5–5 cm diameter, with five lobes on the corolla; color varies from white to pink, often with a yellow blotch.
Rhododendron catawbiense, with common names Catawba rosebay, [2] Catawba rhododendron, [3] mountain rosebay, [3] purple ivy, [3] purple laurel, [3] purple rhododendron, [3] red laurel, [3] rosebay, [3] rosebay laurel, [3] is a species of Rhododendron native to the eastern United States, growing mainly in the southern Appalachian Mountains from West Virginia south to northern Alabama.