Rhododendron arborescens | |
---|---|
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Asterids |
Order: | Ericales |
Family: | Ericaceae |
Genus: | Rhododendron |
Species: | R. arborescens |
Binomial name | |
Rhododendron arborescens | |
Rhododendron arborescens, also known as smooth azalea [1] or sweet azalea, is a species of flowering plant in the family Ericaceae, native to the eastern seaboard of the United States.
It generally blooms in late spring and early summer. The name "sweet azalea" refers to its sweet aroma. The flowers range in color from white to pink with red stamens. The glossy green leaves can also become deep red to purple in the fall. This plant, indigenous to the United States, is generally found growing near moist areas or streams. [2] The plant prefers growth in acidic soil with a pH of 6.8 or less. It grows best in sandy soils above 3000 feet. Grows to a Height of 8–10 feet.
The flowers are also known to contain poisonous substances and must not be consumed by humans. The effects of consuming this plant include depression, vomiting, diarrhea, difficulty in breathing, and most dangerously coma. [3]
The official credit for the discovery of R. arborescens goes to Frederick Traugott Pursh and John Bartram. It was first observed in John Bartram's garden in Philadelphia as well as Blue Mountain, Pennsylvania. [2]
It has also been mentioned that the plant was initially noticed by André Michaux in 1795 in the state of North Carolina. However, after further investigation, no more species were found in his conservatory. Therefore, the recognition for the discovery of the plant was given to Frederick Traugott Pursh and John Bartram. [2]
Rhododendron arborescens was first named Azalea arborescens by Pursh in 1814. However, John Torrey renamed it Rhododendron arborescens in 1824 because he believed that it should not be taxonomically separated from the rhododendrons. [4]
Rhododendron arborescens is a deciduous shrub up to 18 ft (5.5 m) tall, with terminal inflorescences growing from the end of the stems. These plants also generally have yellowish-brown twigs. The green, waxy leaves are 1.75–3 in (4.4–7.6 cm) long, oval and entire with round tips and hairy midribs. Plants found at higher altitudes are generally smaller with smaller leaves. The plant produces from 3 to 7 flowers after a white or blue shade has appeared on the leaves. The stigmas are quite visible all the way up to the petals. [2]
It is distributed in the eastern part of the United States. They are known to grow in parts of West Virginia, Pennsylvania, Tennessee, North Carolina, Georgia and Alabama. They are found among streams near mountains or moist forests. Rhododendron arborescens are generally known as late bloomers. They have a range of blooming from early April till September. [2]
R. arborescens grows best in soil that is slightly acidic at a pH of 5.5-6. It does not grow well in excessive water and drainage is necessary for healthy growth. It is tolerant of full sunlight but must not be overexposed. It is beneficial to plant it with the roots slightly above the ground and accumulating soil up to the plant roots. Organic matter such as sawdust and pinebark may aid the growth of the plant. Depositing a few inches of pine bark or wood chips may help in keeping moisture and preventing weeds from growing around the plant. However, mature R. arborescens do not need to be fed with fertilizer. [5]
This plant has gained the Royal Horticultural Society's Award of Garden Merit. [6] [7]
R. arborescens contains andromedotoxins, specifically known as grayanotoxins which are water-soluble diterpenoid compounds. Both the leaf and flowers of this plant are sources of toxins. Consuming as little as 3 milliliter of nectar per kilogram body weight may be highly pernicious. [8]
Andromedotoxins bind to the Na channels of cell membranes which increases the influx of sodium in the cell and causes extended depolarization. This causes sodium channels to accommodate calcium influx into the cell which also results in depolarization.
Leaf or flower consumption of R. arborescens results in drooling and a blazing sensation in the mouth. This is supplemented with emesis, diarrhea, muscular weakness and weak vision. Other lethal cardiovascular effects include bradycardia, hypotension, and atrioventricular block. Dyspnea, and prostration may develop and someone may die in the span of one to two days.
One way to possibly treat it is to detoxify the body. Emesis, or forcefully vomiting, is one way to rid the body of harmful compounds. Another way to treat it may be to replace the internal body fluid and receive respiratory support. Quinidine is an example of a Na channel blocker which may be helpful in curing heart block. [8]
Kalmia latifolia, the mountain laurel, calico-bush, or spoonwood, is a species of flowering plant in the heath family Ericaceae, that is native to the eastern United States. Its range stretches from southern Maine south to northern Florida, and west to Indiana and Louisiana. Mountain laurel is the state flower of Connecticut and Pennsylvania. It is the namesake of Laurel County in Kentucky, the city of Laurel, Mississippi, and the Laurel Highlands in southwestern Pennsylvania.
Rhododendron is a very large genus of about 1,024 species of woody plants in the heath family (Ericaceae). They can be either evergreen or deciduous. Most species are native to eastern Asia and the Himalayan region, but smaller numbers occur elsewhere in Asia, and in North America, Europe and Australia.
Azaleas are flowering shrubs in the genus Rhododendron, particularly the former sections Tsutsusi (evergreen) and Pentanthera (deciduous). Azaleas bloom in the spring, their flowers often lasting several weeks. Shade tolerant, they prefer living near or under trees. They are part of the family Ericaceae.
The poinsettia is a commercially important flowering plant species of the diverse spurge family Euphorbiaceae. Indigenous to Mexico and Central America, the poinsettia was first described by Europeans in 1834. It is particularly well known for its red and green foliage and is widely used in Christmas floral displays. It derives its common English name from Joel Roberts Poinsett, the first United States minister to Mexico, who is credited with introducing the plant to the US in the 1820s. Poinsettias are shrubs or small trees, with heights of 0.6 to 4 m. Though often stated to be highly toxic, the poinsettia is not dangerous to pets or children. Exposure to the plant, even consumption, most often results in no effect, though it can cause nausea, vomiting, or diarrhea.
Commonly known as hellebores, the Eurasian genus Helleborus consists of approximately 20 species of herbaceous or evergreen perennial flowering plants in the family Ranunculaceae, within which it gave its name to the tribe of Helleboreae. Despite names such as "winter rose", "Christmas rose" and "Lenten rose", hellebores are not closely related to the rose family (Rosaceae). Many hellebore species are poisonous.
Heliotropium arborescens, the garden heliotrope or just heliotrope, is a species of flowering plant in the borage family Boraginaceae, native to Bolivia, Colombia, and Peru. Growing to 1.2 m (3.9 ft) tall and broad, it is a bushy, evergreen, short-lived shrub with dense clusters of bright purple flowers, notable for their intense, rather vanilla-like fragrance. Common names also include cherry pie and common heliotrope. Note that the common name "garden heliotrope" may also refer to valerian, which is not closely related.
Rheum palmatum is a species of flowering plant in the knotweed family Polygonaceae. It is commonly called Chinese rhubarb, ornamental rhubarb, Turkey rhubarb or East Indian rhubarb.
Kalmia polifolia, previously known as Kalmia glauca and commonly called bog laurel, swamp laurel, or pale laurel, is a perennial evergreen shrub of cold acidic bogs, in the family Ericaceae. It is native to north-eastern North America, from Newfoundland to Hudson Bay southwards.
Rhododendron luteum, the yellow azalea or honeysuckle azalea, is a species of flowering plant in the heath family Ericaceae, native to southeastern Europe and southwest Asia. In Europe, it occurs from southern Poland and Austria, south through the Balkans, and east to southern Russia; and in Asia, east to the Caucasus.
Kalmia angustifolia is a flowering shrub in the family Ericaceae, commonly known as sheep laurel. It is distributed in eastern North America from Ontario and Quebec south to Virginia. It grows commonly in dry habitats in the boreal forest, and may become dominant over large areas after fire or logging. Like many plant species of infertile habitats it has evergreen leaves and mycorrhizal associations with fungi. It is also found in drier areas of peat bogs.
Aesculus parviflora, the bottlebrush buckeye or small-flowered buckeye, is a species of suckering deciduous shrub in the family Sapindaceae. The species is native to the southeastern United States, where it is found primarily in Alabama and Georgia, with a disjunct population in South Carolina along the Savannah River. Its natural habitat is in mesic forests, on bluffs and in ravines.
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.
Pieris japonica, the Japanese andromeda or Japanese pieris, is a species of flowering plant in the heath family Ericaceae. It is native to eastern China, Taiwan, and Japan, where it grows in mountain thickets. This medium-sized evergreen shrub or tree is widely cultivated in gardens.
Anemonoides blanda, syn. Anemone blanda, the Balkan anemone, Grecian windflower, or winter windflower, is a species of flowering plant in the family Ranunculaceae. The species is native to southeastern Europe and the Middle East. The specific epithet blanda means "mild" or "charming". The genus name is derived from the Greek word anemos, or wind.
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.
Artemisia arborescens, the tree wormwood, is a species of flowering plant in the family Asteraceae, native to the Mediterranean region. It is an erect evergreen perennial, with masses of finely-divided aromatic silvery-white leaves and single-sided sprays of yellow daisy-like flowers. This plant is cultivated for its foliage effects, but in colder temperate regions it requires the protection of a wall.
Rhododendron mucronulatum, the Korean rhododendron or Korean rosebay, is a rhododendron species native to Korea, Mongolia, Russia, and parts of northern China. It is a deciduous shrub that grows to 1–2 m (3.3–6.6 ft) in height, with elliptic or elliptic-lanceolate leaves, 3–7 cm long by 1–3.5 cm wide. The reddish-purple flowers appear in late winter or early spring, often on the bare branches before the foliage unfurls. It inhabits forested regions at 1,600–2,300 m (5,200–7,500 ft).
Pieris floribunda is a North American species of broadleaf evergreen shrub, a member of the fetterbush genus in the blueberry family (Ericaceae). It is commonly known in North America as mountain fetterbush or mountain andromeda. All parts of Pieris floribunda are poisonous if ingested. In landscapes it should be grown in full to part shade, out of windy locations, and have a good quality soil with much organic matter with acidity of pH 4.5 to 6.5.
Crassula ovata, commonly known as jade plant, lucky plant, money plant or money tree, is a succulent plant with small pink or white flowers that is native to the KwaZulu-Natal and Eastern Cape provinces of South Africa, and Mozambique; it is common as a houseplant worldwide. Much of its popularity stems from the low levels of care needed; the jade plant requires little water and can survive in most indoor conditions. It is sometimes referred to as the money tree; however, Pachira aquatica also has this nickname.
North American azaleas are flowering shrubs in the genus Rhododendron, section Pentanthera, subsection Pentanthera, so named because they all have five stamens. 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 shoot. The flower color, fragrance, and number of stamens vary among species.