Rhododendron atlanticum, the dwarf azalea or coastal azalea, is a species of Rhododendron native to coastal areas of the eastern United States, from New Jersey south to Georgia.
Rhododendron canadense, the rhodora or Canada rosebay, is a deciduous flowering shrub that is native to northeastern North America.
Rhododendron groenlandicum is a flowering shrub with white flowers and evergreen leaves that is used to make a herbal tea.
Rhododendron tomentosum, commonly known as marsh Labrador tea, northern Labrador tea or wild rosemary, is a flowering plant in the subsection Ledum of the large genus Rhododendron in the family Ericaceae.
Rhododendron occidentale, the western azalea or California azalea, is one of two deciduous Rhododendron species native to western North America. 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. Typically found in the coastal ranges of western North America, it also grows in the Cascade and Sierra Nevada mountain ranges, but is not known east of them.
Rhododendron catawbiense, with common names Catawba rosebay, Catawba rhododendron, mountain rosebay, purple ivy, purple laurel, purple rhododendron, red laurel, rosebay, rosebay laurel, is a species of Rhododendron native to the eastern United States, growing mainly in the southern Appalachian Mountains from Virginia south to northern Alabama.
Rhododendron maximum — its common names include great laurel, great rhododendron, rosebay rhododendron, American rhododendron and big rhododendron — is a species of Rhododendron native to the Appalachians of eastern North America, from Alabama north to coastal Nova Scotia.
Rhododendron calendulaceum, the flame azalea, is a species of Rhododendron endemic to the southern and central Appalachians of North America. All parts of this plant are poisonous to humans. Rhododendron calendulaceum is a popular cultivated plant due to its bright yellow, orange or red flowers.
Rhododendron macrophyllum, the Pacific rhododendron, California rosebay, California rhododendron, coast rhododendron or big leaf rhododendron, is a large-leaved species of Rhododendron native to the Pacific Coast of North America. It is the state flower of Washington.
Rhododendron viscosum, the swamp azalea, clammy azalea or swamp honeysuckle, is a species of flowering plant in the heath family Ericaceae. This deciduous shrub, growing to 2.5 m (8.2 ft) tall and broad, is native to the eastern United States. It has rounded matt green leaves. In early summer it produces funnel-shaped white flowers flushed pink. The flowers have prominent stamens and are strongly fragrant.
Rhododendron minus var. chapmanii, also known as Chapman's rhododendron, is an endangered variety, endemic to Florida, of the evergreen Piedmont rhododendron.
The Great Balsam Mountains, or Balsam Mountains, are in the mountain region of western North Carolina, United States. The Great Balsams are a subrange of the Blue Ridge Mountains, which in turn are a part of the Appalachian Mountains. The most famous peak in the Great Balsam range is Cold Mountain, which is the centerpiece of author Charles Frazier's bestselling novel Cold Mountain.
Rhododendron periclymenoides, the pink azalea 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. It is often found in riparian areas, in wet to dry forests.
Rhododendron prunifolium, the plumleaf azalea, is a wild azalea that grows only in a few counties along the Georgia–Alabama border in the Chattahoochee River Valley. It is considered the rarest azalea in the Eastern United States. Providence Canyon is one of the most popular places to view the plumleaf azalea in the wild.
Rhododendron vaseyi is a species of flowering plant in the heath family known by the common name pinkshell azalea. It is endemic to the Appalachian highlands of North Carolina in widely scattered locations. While there is a main center of distribution west of Asheville, there is also a large population on Grandfather Mountain, in the northwestern corner of the state.
Rhododendron lapponicum, the Lapland rosebay, is a dwarf rhododendron species found in subarctic regions of North America, Europe and Asia, where it grows at altitudes ranging from sea level to 1,900 m (6,200 ft). It is an evergreen prostrate shrub growing to 20–45 cm (7.9–17.7 in) in height, with leaves that are oblong-elliptic or ovate-elliptic to oblong-obovate, 0.4–1.5 by 0.2–0.5 cm in size. The flowers are reddish or purple.
Rhododendron minus, the Piedmont rhododendron, is a rhododendron species native to Tennessee, North Carolina, South Carolina, Georgia, and Alabama. It has two subspecies:
Rhododendron minus var. minus, the Carolina azalea or Carolina rhododendron, is a rhododendron species native to the mountains of North Carolina, South Carolina, Tennessee, and Northeast Georgia. It is commonly known as Rhododendron carolinianum in the horticultural trade.
Rhododendron konori, the Konor rhododendron, is a rhododendron species native to Irian Jaya, Indonesia, and Papua New Guinea. It is an evergreen shrub or small tree growing to 3–3.5 m (9.8–11.5 ft) in height. The strongly scented flowers range from pure white to dark red.
Ledol is a poisonous sesquiterpene that can cause cramps, paralysis, and delirium. Caucasian peasants used Rhododendron plants for these effects in shamanistic rituals.
