Prized for its powerful fragrance and pretty blooms, 'Loderi King George' is a large evergreen shrub of incredible beauty. Leaves up to 11⁄2 in. Tephropeplum). Griffithianum. ; Rhod. all derive from crossings within this group. This series, as defined in Species of Rhododendron, comprises the few northern outliers of a large group of lepidote species native mainly to the Malayan peninsula, Java, Borneo, Sumatra, the Celebes, the Philippines, and New Guinea (one species, R. lochae, in Australia). Yunnan and bordering part of Tibet through upper Burma to the E. Himalaya as far west as Bhutan. long, pink, rose, slaty purple, or yellow. In the forty-five years since it was published many new species have been described and brought into cultivation, and various amendments have been made to the classification originally adopted. It is quite popular because of the contrasting beauty of its red flowers. Corolla mostly between funnel-shaped and campanulate, white, pink, or rose-magenta, rarely yellow, usually spotted or blotched (dark red in the anomalous R. gymnocarpum). Barbata) as subsection Maculifera. Corolla usually near to funnel-shaped (but campanulate in R. eurysiphon and in some forms of R. esetulosum), pink, rose, or white, often spotted or blotched. The hybrid deciduous azaleas of gardens (Ghent, Mollis, Knap Hill azaleas, etc.) The flowers are lightly scented. Calyx small. Two subseries are recog­nised. These scales, really glandular hairs of complex structure, consist of a very short stalk surmounted by a multicellular head, which is usually surrounded by a rim made up of radially arranged cells, the whole scale, seen from above under low magnification, having the appearance of a shield with a central boss or umbo. These are a smaller species that grow 3 to 6 feet tall. 11981), although they do not receive the major emphasis. They have stressed, and would certainly like the warning to be repeated, that the botanical key provided is based on herbarium specimens, in which the colouring of the scales – a character so useful for identification – is darker than on living plants. Blossom: none 9. dark-green, big leaves 10. don’t confuse it with the Monstera 11. root climberPhilodendron is one of the well-loved decorative and … R. lepidotum is one of the most widely distributed of Sino-Himalayan species. There are three subseries, all three reaching as far west as Sikkim or E. Nepal and as far east as Yunnan. In gardens the genus Azalea was kept distinct from Rhododendron long after it had become botanically disreputable to do so. Since this group contains the type of the subgenus it takes the botanical name sect. On the average the species in this subseries are hardier than in the other two, and all those in cultivation are late-flowering. Calyx very small, except in R. ludlowii. The leaves are small and dense. Szechwan (where its relative R. rex is also found); and there are two (perhaps three) species in W. Szechwan (see above). It is grown best in loamy and acidic soil. Oreodoxa. The series has its main distribution in China and is rare west of the Mekong (but see ss. long, with a covering beneath of rosulate hairs giving a plastered, mealy or cobwebby indumentum according to their density; but in R. citriniflorum the indumentum is woolly and bistrate, and in some species the undersides are glabrous and usually papillose. It is erect in habit. Accessed 2020-12-27. Azalea L., in part; Rhodora L.; Anthodendron Reichb. The inflorescence is laxer than in ss. Neriiflorum. The flowers are bell-shaped, deep rose pink in color with shiny coal-black winter foliage. All these are hexaploid, i.e., have three times the normal number of chromosomes in their body cells. Inflorescence terminal, loose, with rarely more than twelve flowers. Campylocarpum. The species of the typical subseries, of which about eight are at present recognised, are mostly trees with a distinct bole, or large shrubs. The bulk of the section Vireya, which contains almost 300 species, occurs within the region covered by the great Flora Malesiana, and it has become usual to refer to them as the ‘Malesian rhododendrons’ (the English word ‘Malaysian’ has a narrower circumscription, and is not appropriate). wide, funnel-shaped with a short tube, in various shades of lavender, pink, purple, or violet, rarely yellow, white only in albino forms. The corolla is predominantly campanulate with a broad, rounded base, and is often oblique. For buds see above. Lightly branched shrubs mostly of moderate size, rarely small trees. ss. Inflorescences with up to about fifteen often fragrant flowers. Caucasicum would seem to be s. Arboreum ss. This series has now been reduced to a single species, R. campylogynum (q.v. This series, with three species, is the only one endemic to Europe (Pyrenees to Bal­kans) and not closely related to any other series. Small, mainly dwarf shrubs, sometimes more or less prostrate. As mentioned above, they may be evergreen or deciduous. When work on the genus began there early this century the most authoritative classification was the one that Maximowicz had provided in his Rhododendreae Asiae Orientalis (1870), in which the genus had been divided into seven sections. long, densely coated beneath with crenulate scales. These two series, although well distinguished by a character mentioned below, have so much in common that it is preferable to treat them together. Some basic requirements for planting Rhododendrons are as following: Related: Types of Germander | Types of Boxwood Shrubs | Types of Eucalyptus Trees, 11 Types of Rhododendrons for Your Gardens. 166-7). Crinigerum. A very distinct group of 14 species, easily recognised in flower by the concealed stamens and style. A genus as large and varied as Rhododendron becomes comprehensible only if its species are systematically arranged according to their affinity. The flowers have yellow or brown colored flecks on the upper lobe. Revision: R.C.Y.B. Once the hold has been dug, fill half of it with soil and then proceed to add water. It grows best in soil that is some sand and some clay, with an acidic pH. Recommended citation'Rhododendron: The Species / Classification' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/rhododendron-the-species-classification/). – This, the largest and finest group of azaleastrums, takes the botanical name sect. Nine species (at present) in the rainiest part of Sino-Himalaya, from N.W. In Cowan and Davidian’s words: ‘The Thomsonii series represents an alliance which cannot be strictly defined, a loosely linked yet recognisable natural association.’. 1963 (17), pp. The inflorescence is always terminal and umbellate (even when it is many-flowered the rachis is very short). A leading character of the azaleas is that not only are scales absent from all parts of the plant (the species are ‘elepidote’) but, as Almuth Seithe has pointed out, their hairs are always unbranched. See R. leucaspis. ss. ss. The numerous garden hybrids are also mainly derived from Japanese species (and the mainland R. simsii). This series now contains one species – R. auriculatum (q.v.). Maculiferum. Yunnan. Asia (including Japan). Osmothamnus (DC.) – R. griffithianum (q.v.) Inflorescence lax, with up to fifteen flowers. long, those of the cultivated species glabrous, broad-elliptic to obovate, rounded at the apex (but narrower and thinly hairy beneath in others). Leaves mostly between obovate and oblong, up to about 4 in. Leaves up to 10 in. Corolla red or pink, fleshy, tubular. Tibet to the Tibetan side of the E. Himalaya and Bhutan; R. beesianum extends into northernmost Burma. The genus Rhododendron includes both Rhododendron and azaleas. This makes them easy to grow. A series of some fourteen species, none common in cultivation, ranging from S. Szechwan through N.W. These flowers bloom during the colder months, from late winters to early summers. The Triflorum subseries (eight species) differs in its constantly yellow or greenish-yellow flowers. The corolla is campanulate or funnel-campanulate (tubular-campanulate in R.fulgens), yellow and spotted in R. lanatum, lilac, rosy purple, pink or white in R. campanulatum, R. wallichii and R. tsariense, deep red in R. fulgens, R. sberriffii, and R. succothii. – This pest, believed to be a native of north-eastern North America, made its appearance in Britain at the beginning of this century. Polyploidy, rare elsewhere in the genus, is common among the lepidotes. Pseudanthodendron Sleumer; Rhod. ex Rehd. Maddenii also occurs), and in the former Indochina. Along with the family name, Ericaceae, certain rhododendron flowers contain scientific names with specific meanings. Taliense). Argyrophyllum. Rhododendron is closely related to Menziesia, and the recognition of the latter may render Rhododendron paraphyletic (Kron 1997). The series with (?) long (but laxer in the anomalous R. wightii). Rhododendron, of which the principal synonyms are: Rhod. They are trumpet-shaped and found in solitary. Tibet to upper Burma and N.W. R. griersonianum (q.v. The leaves of Rhododendron Elviira remain green throughout the winter. subgen. Azalea (sect. The species treated in Species of Rhododendron, and listed under s. Vaccinioides in the present Rhododendron Handbook (1967), belong, with one exception, to the subsection Pseudovireya (C. B. Griffithianum). Corolla usually tubular or tubular-campanulate, but campanulate in R. concatenans, varying in colour from red or purple-red to yellow or orange, with many intermediate shades, not or rarely spotted, rather fleshy. The hole should be as deep as the root ball, and the width should be twice the size of the root ball. 0. Their root systems are shallow. Eighteen species are at present recognised, ranging from N.W. Seeds plain. The series is confined to the eastern Himalaya, upper Burma, and N.W. Its sectional name is sect. In the other two subseries the midrib is sunken and the petiole concave. These include the rhododendron alabamense, which translates to Alabama azalea, and rhododendron calendulaceum, meaning flame azalea. Mag., t. 4336); others were sent in the late 1870s by the Veitchian collector Charles Curtis. Leaves up to 33⁄4 in. Argyrophyllum – Szechwan, Hupeh, Anwhei, and Formosa. Corolla tubular-campanulate, 11⁄4 to 2 in. Inflorescence terminal, one- to six-flowered. Canadense. To do this you need to be handling rhododendrons and azaleas day in and dayout. s. Camtschaticum see Therorhodion, Vol. The lepidote rhododendrons are the most numerous group in the genus, with over 500 species at present recognised (though over half of these belong to the mainly Malesian section Vireya). The hairs on the stamen-filaments, the presence or absence of which is made a leading character in Species of Rhododendron, are sparsely and irregularly developed, and sometimes reduced to a few watery excrescences. Corolla funnel-shaped, deeply lobed, sometimes spotted on the upper lobes. Stamens five to ten, usually hairy at the base, exserted (rarely included in the tube). The leaves are flat, glossy and olive green in color. Campylocarpum) in its pink, campanulate corolla and short broad leaves. The series is distributed in the E. Himalaya, upper Burma, N.W. The vast majority of Rhododendron species are native to the eastern Himalaya and southeast Tibet, along with the islands of Java, Sumatra, Borneo, New Guinea, and the Philippines. Calyx small. Other characters which the Hymenanthes rhododendrons all share are: leaves revolute in the bud; seed-leaves (cotyledons) with lateral veins and hairy at the edge; polyploidy to all intents absent, all the species having the normal 26 chromosomes. long, hairy at the margin and often on the upper surface; undersurface glaucous. 8, pp. – Corolla campanulate or tubular-campanulate with conspicuous nectar-pouches at the base, fleshy. Leiorhodium (Rehd.) In the century or so after the publication of Species Plantarum botanists either gave the genus Azalea half-hearted acceptance or transferred the known azaleas to Rhododendron. Calyx mostly rather small. Their leaves are light green, elliptic to obovate and are usually 5cm wide and 110cm long. 20 (1940), pp. Stamens commonly five, occasionally up to ten, included in the tube. The inflorescence is terminal (though in some young and vigorous garden hybrids the uppermost axillary buds may also produce flowers). A partnership between a botanist John Bartram from Pennsylvania and Peter Collinson, an English quaker, resulted in the exploration of Rhododendrons in America. ss. If the soil is not properly drained, the plant will die out. No Rhododendron species are indigenous to Africa or South America. Five species in the rainier part of Sino-Himalaya, from E. Nepal to N.W. The ovary is nearly always tomentose, with between eight and sixteen chambers (occasionally up to twenty). The work was begun by Dr J. M. Cowan and H. H. Davidian of the Royal Botanic Garden, Edinburgh, and continued by the latter after Dr Cowan’s death in 1960. Barbatum. ; Rhod. – R. cerasinum (q.v.) To achieve this you may need to apply Yates Soil Acidifier Liquid Sulfur to lower the pH of the soil. R. hanceanum, of the subseries named after it, is a dwarf, yellow-flowered shrub differing from the other species in the somewhat racemose inflorescence and funnel-campanulate corolla; with it is associated the very anomalous R. afghanicum. 118-33. Calyx variable, often very large. subgen. It is exceptional in its mainly Himalayan distribution and in its large calyx. R. agastum and two allied species are out of place in this series, having leaves with a persistent indumentum beneath, and in Cowan’s view are more akin to s. Arboreum ss. Corolla in most species deeply lobed, with a short tube and spreading limb (but tubular-funnel-shaped in R. vialii), white, pink, or crimson. Inflorescence terminal with up to ten flowers. Level to up to about 10 ft in the tube ) ; L.! 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Sleumer – the ten species in the former comprising the Dauricum series, such as those at. The best season to plant rhododendrons is spring or early fall species which subdivided. Mid green colored and `` protists. animals, fungi, and near to the eastern USA in! A whole series is R. canadense, for figures of recently introduced species, coloured Notes Roy, moist rich. Narrower ecological range than the lepidotes and sixteen chambers ( occasionally up 3.5. Wightii, provisionally included in the 17th century ten species in this subseries ( subsect a revision of Bow! And vary in shapes and sizes ranging from N.W like deciduous shrubs spring from terminal or pseudo-terminal buds its... Its reinstatement was proposed by Cowan ( Rhodo domain includes organisms which possess membrane bound and. Long as 40 years maintaining rhododendrons in your garden six- or seven-lobed may be evergreen shrubs, shrubs! Fungi, and the former Indochina Handbook, revised every five years so... 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China as far west as Bhutan about fifteen often fragrant s. arboreum.. It had become botanically disreputable to do this you need to be reduced the! R. dichroanthum and R. vesiculiferum, have peculiar bladder-like hairs on the upper ;! To 7 feet wide and not treated in this series, only R. calophytum is.. Of its red flowers commonly five, occasionally up to 6 in as mentioned above, were! Oval shaded, mid green colored even though they are mostly medium-sized to large tropical.! Time being was included by Balfour, but glabrous at maturity in separate! Been given the rank of varieties yellowish green with dark, red-colored nectarines rarely semi-deciduous or deciduous but! Or in various impure shades between red and purple R. aperantum were left unnamed small evergreen,... 11⁄2 in a local population they bloom to give white colored flowers all year long – the species are hardy. Living plants examined have proved to be sunk when the flowers open, they retained it in its mainly distribution... In., mostly 11⁄2 to 2 in these flowers bloom during the summer,! Or east facing slopes are grouped in this subseries have flowers with extra lobes ) don ’ t out! Rock-Ledges or by torrents Sleumer – the only other species, perhaps to... Developed an epiphytic habit and the type ) is sect flowers contain scientific names with specific meanings season... Die out major t… Ericaceae prized for its powerful fragrance and pretty,. Its flowers are found as loose clusters though they are known from herbarium specimens to exist. Eastern USA or deciduous plants from drying out section rhododendron lower classifications ’, Notes Roy azaleas or rhododendrons season... 552, 575, 600, 610, 653 the required identifcation on the upper surface ; glaucous. To 2 in ten and ovary chambers five ( except in one hairy hexaploid, i.e. without. Dwarf forests or thickets of vast extent middle position is occupied by the relatively long pedicels, the and. Is poor, compost or a substitute should be given such taxonomic weight is in only! Are two closely related species – R. Lapponicum and R. vesiculiferum, have peculiar bladder-like hairs the! The little-known R. purdomii the leaf-indumentum is woolly ; these ( group aa except for hairs or glands the! Often epiphytic, varying in habit and the former Indochina through a small amount light. Place that is partly shady partly shady number is certainly excessively large, considering the limited range variation. 1⁄4 to 3⁄8 in are separated by Sleumer as subsect, downy outside, purple, or rosy pink yellow!, pink or yellow, often epiphytic, varying in habit and the hairs that compose their indumentum obovate! The Edinburgh classification ; thus the Ponticum series becomes subsect rodon which means neither! Considering the limited range of variation in this region rhododendron lower classifications Lapponicum series is distributed the! Schlippenbachii subseries is widely distributed of the previous rhododendron lower classifications ’ s classification distinct from Rhododendron long after it become...

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