The formal description (Craven 2008) is: Scales sessile or sometimes stalked, lobed to deeply incised or sometimes entire; corolla campanulate, trumpet-like, salver-shaped, tubular or funnel-shaped; stamens (5–)10(–16), exserted to included, staminal filaments glabrous or hairy from the base; capsule valves twisting after dehiscence; seeds with a distinct tail at each end. The large number of species that were available by the early twentieth century prompted a new approach when Balfour introduced the concept of grouping species into series. Amongst the Zomi tribes in India and Myanmar, "Rhododendrons" called "Ngeisok" is used in a poetic manner to signify a lady. Vireya rhododendrons flower all year. Despite a degree of paraphyly, the subgenus Rhododendron was otherwise untouched with regard to its three sections but four other subgenera were eliminated and one new subgenus created, leaving a total of five subgenera in all, from eight in Chamberlain's scheme. [49], Rhododendron bud blast, a fungal condition that causes buds to turn brown and dry, and not open, is caused by the fungus Pycnostysanus azaleae, which may be brought to the plant by the rhododendron leafhopper, Graphocephala fennahi.[50](p562). Vireya ندارد. Rhododendron arboreum is also the state tree of the state of Uttarakhand, India. Eleven similar cases have been documented in Istanbul, Turkey during the 1980s. Many have unusual types of flowers. Species in this genus may be part of the heath complex in oak-heath forests in eastern North America. Vireya rhododendrons are too lovely to lose. Goetsch (2011) gives the number of species as 320, and the total taxa including subspecies, forms and varieties as 380. Care. (2005) Table 1.[2]. Consequently, the taxonomy has been historically complex. The next two smaller subgenera (Pentanthera and Tsutsusi) represent the 'Azaleas'. Subgenus Rhododendron L.: small leaf or lepidotes (with scales on the underside of their leaves); several hundred species, type: Rhododendron ferrugineum. ISBN 1-902896-61-0] Relatively fewer species occur in North America and Europe. A comprehensive information resource covering all aspects of Vireya Rhododendron culture, including cultivation advice, background history, classification & distribution, together with complete listings of named hybrids and Photogallery containing over 900 images. Most species have brightly colored flowers which bloom from late winter through to early summer.[6]. [65][66], Rhododendrons are extensively hybridized in cultivation, and natural hybrids often occur in areas where species ranges overlap. [73], Some species of rhododendron are poisonous to grazing animals because of a toxin called grayanotoxin in their pollen and nectar. (Fayaz). Rhododendron /ˌroʊdəˈdɛndrən/ (from Ancient Greek ῥόδον rhódon "rose" and δένδρον déndron "tree")[4][5] is a genus of 1,024 species of woody plants in the heath family (Ericaceae), either evergreen or deciduous, and found mainly in Asia, although it is also widespread throughout lowland and montane forests in the Pacific Northwest, California, the Northeastern United States, and especially in the highlands of the Appalachian Mountains of North America. Known for their brilliant colour, vireyas are the star of the rhododendron family, often flowering all year round. The major finding of Goetsch and colleagues was that all species examined (except R. camtschaticum, subgenus Therorhodion) formed three major clades which they labelled A, B and C, with the subgenera Rhododendron and Hymenanthes nested within clades A and B as monophyletic groups respectively. In some species, the undersides of the leaves are covered with scales (lepidote) or hairs (indumentum). In some areas, larger rhododendrons can be pruned to encourage more tree-like form, with some species such as Rhododendron arboreum and R. falconeri eventually growing to 10–15 m or more tall. Retrieved from "https://species.wikimedia.org/w/index.php?title=Rhododendron_subsect._Discovireya&oldid=8029690" proposed there be only two subsections of Vireya, corresponding to the core species, Euvireya and the much smaller Malayovireya , while the other two groups formed out of Pseudovireya be raised to section rank, keeping the original name Pseudovireya for the mainland species, and using Argent's name, Discovireya for the Malesian species. Subgenus Rhododendron L. (3 sekce, 462 druhů: zvýšeno na pět sekcí v roce 2008) ( Discovereya (Sleumer) Argent, zvednutý z Vireya) Pogonathum Aitch. More than 90% of Rhododendron sensu Chamberlain belong to the Asian subgenera Rhododendron, Hymenanthes and section Tsutsusi. Following publication of the studies of Goetsch et al. [30][31] In 1986 Philipson & Philipson raised two sections of subgenus Aleastrum (Mumeazalea, Candidastrum) to subgenera, while reducing genus Therorhodion to a subgenus of Rhododendron. Jul 16, 2018 - Vireya rhododendrons grow well in warm climates, and often bloom multiple times a year. Terminology from the Sleumer (1949) system is frequently found in older literature, with five subgenera and is as follows; In the later traditional classification, attributed to Chamberlain (1996), and as used by horticulturalists and the American Rhododendron Society,[44] Rhododendron has eight subgenera based on morphology, namely the presence of scales (lepidote), deciduousness of leaves, and the floral and vegetative branching patterns, after Sleumer (1980). Consequently, the taxonomy has been historically complex.. Linnaeus' six species of Azalea were Azalea indica, A. pontica, A. lutea, A. viscosa, A. lapponica and A. procumbens (now Kalmia procumbens), which he distinguished from Rhododendron by having five stamens, as opposed to ten. It is admired for its distinctive flavor and color.[81]. Starr 020815-0030 Rhododendron sp..jpg 1,600 × 1,200; 421 KB Por ejemplo Rhodora (Linnaeus 1763) para Rhododendron canadense, Vireya ( Blume 1826) y Hymenanthes (Blume 1826) para Rhododendron metternichii, ahora R. degronianum. With only a couple of exceptions, we have at least one of all of these growing in our gardens. Early history. [42] Many species and cultivars are grown commercially for the nursery trade. griffithianum. It is the national flower of Nepal, the state flower of Washington and West Virginia in the United States, the provincial flower of Jiangxi in China and the state tree of Sikkim and Uttarakhand in India. Vireya rhododendron ‘Sweet Vanilla’ with ‘Golden Charm’ in the background. As new species of what are now considered Rhododendron were discovered, if they seemed to differ significantly from the type species they were assigned to separate genera. Languages. These scales, unique to subgenus Rhododendron, are modified hairs consisting of a polygonal scale attached by a stalk. giganteum, reported to 30 m (100 ft) tall. Rhododendron subsp. Here is a listing of our Virayas. Half hardy 0.6 x 0.6m. This genus has been progressively subdivided into a hierarchy of subgenus, section, subsection, and species. Blumea 53: 435–442. [2], The 300 tropical species within the Vireya section of subgenus Rhododendron occupy the Malay archipelago from their presumed Southeast Asian origin to Northern Australia, with 55 known species in Borneo and 164 in New Guinea. Information+photos of hybrids and species. 2020. Classification. )[41], Subsequent research has supported the revision by Goetsch, although has largely concentrated on further defining the phylogeny within the subdivisions. They are distinguished from "true" rhododendrons by having only five anthers per flower. ویکی‌پدیا هنوز مقاله‌ای درباره en:Rhododendron sect. See Thursday Next series,[78] and Shades of Grey. The tropical rhododendrons (sect. [34] Chamberlain and Rae moved the monotypic section Tsusiopsis together with the monotypic genus Tsusiophyllum into section Tsutsusi,[35] while Kron & Judd reduced genus Ledum to a subsection of section Rhododendron. Mulch with Living Earth More then Mulch to suppress weeds and reduce watering needs. [70][71] Animal studies and in vitro research has identified possible anti-inflammatory and hepatoprotective activities which may be due to the antioxidant effects of flavonoids or other phenolic compounds and saponins the plant contains. 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