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Rhododendron Sect. Rhodora
''Rhodora'' was a section of subgenus ''Pentanthera'' in the genus ''Rhododendron'', that has since been discontinued. Description The section was closely related to sect. ''Pentanthera'', differing from it in the flower corolla having only three lobes, rather than five, the upper three lobes of sect. ''Pentanthera'' being joined into a single three-lipped lobe in sect. ''Rhodora''. Taxonomy The distinct floral structure resulted in Rhodora being treated as a distinct genus at one time. Treating it as such though resulted in the remainder of the genus ''Rhododendron'' being paraphyletic. However detailed phylogenetic analysis revealed that ''Rhodora'' was not a distinct entity, but rather polyphyletic, and it was disassembled, each species being allocated to other sections. ''Rhododendron canadense'' was moved to section Pentanethera, subgenus '' Hymenanthes'' and ''Rhododendron vaseyi'' was moved to section Sciadorhodion, which then became a new section of subgenus Azal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhododendron Canadense
''Rhododendron canadense'', the rhodora or Canada rosebay, is a deciduous flowering shrub that is native to northeastern North America. Classification Today's botanists consider the rhodora to be a distant relative of the other North American members of its genus, but the difference in floral structure did lead 19th century taxonomists to assign the plant its own genus ''Rhodora''. Its closest relative is '' Rhododendron vaseyi'' from the Appalachian Mountains, which differs in having seven stamens. DNA sequencing shows that ''R. vaseyi'' is not related to ''R. canadense'', but more to '' R. albrechtii''. Description It reaches a mature height of 0.5–1.2 m (approximately 1–3 feet). In early spring, it produces pinkish-purple flowers in clusters of 2–6 together; each flower is 2–3 cm (approximately 1 inch) in diameter, with a five-lobed purple corolla. The flowers are unusual in comparison with other species of the genus ''Rhododendron'' found in northeaster ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deciduous
In the fields of horticulture and Botany, the term ''deciduous'' () means "falling off at maturity" and "tending to fall off", in reference to trees and shrubs that seasonally shed leaves, usually in the autumn; to the shedding of petals, after flowering; and to the shedding of ripe fruit. The antonym of ''deciduous'' in the botanical sense is evergreen. Generally, the term "deciduous" means "the dropping of a part that is no longer needed or useful" and the "falling away after its purpose is finished". In plants, it is the result of natural processes. "Deciduous" has a similar meaning when referring to animal parts, such as deciduous antlers in deer, deciduous teeth (baby teeth) in some mammals (including humans); or decidua, the uterine lining that sheds off after birth. Botany In botany and horticulture, deciduous plants, including trees, shrubs and herbaceous perennials, are those that lose all of their leaves for part of the year. This process is called a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plant Sections
Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclude the fungi and some algae, as well as the prokaryotes (the archaea and bacteria). By one definition, plants form the clade Viridiplantae (Latin name for "green plants") which is sister of the Glaucophyta, and consists of the green algae and Embryophyta (land plants). The latter includes the flowering plants, conifers and other gymnosperms, ferns and their allies, hornworts, liverworts, and mosses. Most plants are multicellular organisms. Green plants obtain most of their energy from sunlight via photosynthesis by primary chloroplasts that are derived from endosymbiosis with cyanobacteria. Their chloroplasts contain chlorophylls a and b, which gives them their green color. Some plants are parasitic or mycotrophic and have lost the abili ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Systematic Botany
Plant taxonomy is the science that finds, identifies, describes, classifies, and names plants. It is one of the main branches of taxonomy (the science that finds, describes, classifies, and names living things). Plant taxonomy is closely allied to plant systematics, and there is no sharp boundary between the two. In practice, "plant systematics" involves relationships between plants and their evolution, especially at the higher levels, whereas "plant taxonomy" deals with the actual handling of plant specimens. The precise relationship between taxonomy and systematics, however, has changed along with the goals and methods employed. Plant taxonomy is well known for being turbulent, and traditionally not having any close agreement on circumscription and placement of taxa. See the list of systems of plant taxonomy. Background Classification systems serve the purpose of grouping organisms by characteristics common to each group. Plants are distinguished from animals by various tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhododendron Vaseyi
''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 vaseyi''. The Nature Conservancy. This shrub may grow up to 5 meters (almost 17 feet) in height. The large flowers are pink and begin to bloom in April. This species was first collected in 1878 by G. R. Vasey, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhododendron Canadense 15-p
''Rhododendron'' (; from Ancient Greek ''rhódon'' "rose" and ''déndron'' "tree") 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. It is the national flower of Nepal, the state flower of Washington and West Virginia in the United States, the state flower of Nagaland in India, the provincial flower of Jiangxi in China and the state tree of Sikkim and Uttarakhand in India. Most species have brightly colored flowers which bloom from late winter through to early summer. Azaleas make up two subgenera of ''Rhododendron''. They are distinguished from "true" rhododendrons by having only five anthers per flower. Species Description ''Rhododendron'' is a genus of shrubs and small to (rarely) large trees, the smallest species growing to tall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North America
North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. Because it is on the North American Plate, North American Tectonic Plate, Greenland is included as a part of North America geographically. North America covers an area of about , about 16.5% of Earth's land area and about 4.8% of its total surface. North America is the third-largest continent by area, following Asia and Africa, and the list of continents and continental subregions by population, fourth by population after Asia, Africa, and Europe. In 2013, its population was estimated at nearly 579 million people in List of sovereign states and dependent territories in North America, 23 independent states, or about 7.5% of the world's population. In Americas (terminology)#Human ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shrub
A shrub (often also called a bush) is a small-to-medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees by their multiple stems and shorter height, less than tall. Small shrubs, less than 2 m (6.6 ft) tall are sometimes termed as subshrubs. Many botanical groups have species that are shrubs, and others that are trees and herbaceous plants instead. Some definitions state that a shrub is less than and a tree is over 6 m. Others use as the cut-off point for classification. Many species of tree may not reach this mature height because of hostile less than ideal growing conditions, and resemble a shrub-sized plant. However, such species have the potential to grow taller under the ideal growing conditions for that plant. In terms of longevity, most shrubs fit in a class between perennials and trees; some may only last about fiv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Azaleastrum
''Rhododendron'' subgenus ''Azaleastrum'' is a subgenus of the genus ''Rhododendron ''Rhododendron'' (; from Ancient Greek ''rhódon'' "rose" and ''déndron'' "tree") 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 nati ...''. The subgenus included two sections, however in 2005, Choniastrum was elevated to subgenus rank, but sections Sciadorhodion and Tsutsusi were added, providing a new total of three sections. * ''Azaleastrum'' sect. ''Azaleastrum'' (4 species) * ''Azaleastrum'' sect. ''Sciadorhodion'' * ''Azaleastrum'' sect. ''Tsutsusi'' (81 species) References Bibliography Wilson EH, Rehder A. A MONOGRAPH OF AZALEAS RHODODENDRON SUBGENUS ANTHODENDRON. THE UNIVERSITY PRESS, CAMBRIDGE April 15 1921. PUBLICATIONS OF THE ARNOLD ARBORETUM, No. 9 * Azaleastrum Plant subgenera {{Ericaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentanthera
''Rhododendron'' subgenus ''Pentanthera'' was a subgenus of the genus ''Rhododendron''. The common name azalea Azaleas are flowering shrubs in the genus ''Rhododendron'', particularly the former sections '' Tsutsusi'' (evergreen) and '' Pentanthera'' (deciduous). Azaleas bloom in the spring (April and May in the temperate Northern Hemisphere, and Oct ... is applied to many of the species, and also to species in some other subgenera. In 2005 it was discontinued and its four sections moved or dismembered. The subgenus included four sections: *''Rhododendron'' sect. '' Pentanthera'' *''Rhododendron'' sect. '' Rhodora'' *''Rhododendron'' sect. '' Sciadorhodion'' *''Rhododendron'' sect. '' Viscidula'' References Bibliography *Huxley, A., ed. (1992). ''New RHS Dictionary of Gardening''. Macmillan. Pentanthera Plant subgenera Historically recognized angiosperm taxa {{Ericaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hymenanthes
''Rhododendron'' subg. ''Hymenanthes'' is a subgenus of the genus ''Rhododendron'', with a widespread distribution in the temperate Northern Hemisphere. The species are evergreen shrubs and small to medium-sized trees (up to 20 m tall), with medium-sized to large leaves (very large, over 40 cm long, in a few species). The flowers are large, produced in terminal trusses of 5-40 together. The subgenus includes two sections, ''Rhododendron'' sect. ''Ponticum'', divided into 24 subsections and about 140 species, and (since 2005) ''Rhododendron'' sect. ''Pentanthera'' Section ''Ponticum'' (24 subsections) * ''R.'' subsect. ''Arborea'' (3 species) * ''R.'' subsect. ''Argyrophylla'' (6 species) * ''R.'' subsect. ''Auriculata'' (one species, ''R. auriculatum'') * ''R.'' subsect. ''Barbata'' (2 species) * ''R.'' subsect. ''Campanulata'' (2 species) * ''R.'' subsect. ''Campylocarpa'' (4 species) * ''R.'' subsect. ''Falconera'' (7 s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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