Rhododendron concinnum is a plant from the genus of Rhododendron ( Rhododendron ) in the family of the Ericaceae (Ericaceae). The natural range is in China.
Appearance and foliage leaf
Rhododendron concinnum grows as a shrub that can reach stature heights of rarely 0.4, usually 1.5 to 3 meters. Young twigs have scaly bark .
The alternate leaves arranged on the branches are divided into a petiole and a leaf blade. The densely scaled petiole is 0.5 to 1.3 inches long. The simple leaf blade is elongated, elliptical, ovate, oblong-lanceolate or ovate-lanceolate with a tapering to pointed, pointed upper end with a length of 2.5 to 7.5 centimeters and a width of 1.5 to 3.5 centimeters . The upper side of the leaf is more or less scaly and is occasionally downy hairy along the midrib. The pale pink, green to brown underside of the leaves is continuously covered with scales or at a distance from one another that corresponds to half to the entire diameter of this scale.
Inflorescence and flower
The flowering period in China extends from April to June. The more or less terminal, golden inflorescence contains only two to five flowers. The densely scaled flower stalk is 0.4 to 1.8 inches long.
The hermaphrodite flowers are almost radially symmetrical and five-fold with a double flower envelope . The five sepals are fused. With a length of 0.8 to 1.5, rarely up to 6 millimeters, the calyx lobes are rounded triangular to elongated. Occasionally the sepals are not fully developed and then form a wreath-like calyx rim. The five 1.5 to 3.2 centimeters long petals are fused together like a funnel-shaped bell and more or less scaled on the outside. Their base can be sparsely hairy and downy. The color of the petals is pale to dark purple and they can have brownish-red spots both on the outside and on the inside. The ten unequal stamens are the same length as the petals. The stamens are hairy at their base. The upper, five-chamber ovary is densely covered with scales. The stylus, which is mostly bald and rarely hairy at its base, is slightly longer than the petals.
Fruit and seeds
The capsule fruit is 1 to 1.5 centimeters long and cylindrical when ripe. The fruits ripen from September to October. The tiny seeds are wingless.
The natural range includes the Chinese provinces of Guizhou , Henan , Hubei , Shaanxi , Sichuan and Yunnan .
Rhododendron concinnum thrives in firs - rhododendron forests and thickets on slopes at altitudes of mostly 2300 to 3000, rarely up to 3800 meters.
The first description of Rhododendron concinnum was in 1889 by William Botting Hemsley in Francis Blackwell Forbes and William Botting Hemsley: Journal of the Linnean Society, Botany , Volume 26 (173), pages 20-21. The type material was collected by E. Faber in Sichuan on the summit of Mount Omei and deposited in the herbarium of the Royal Botanic Gardens in Kew . Synonyms of Rhododendron concinnum Hemsl. are: Rhododendron apiculatum Rehder & EHWilson , Rhododendron benthamianum Hemsl. , Rhododendron concinnum var. Benthamianum (Hemsl.) Davidian , Rhododendron concinnum var. Lepidanthum (Rehder & EHWilson) Rehder , Rhododendron concinnum var. Pseudoyanthinum (Balf. F. Ex Hutch.) Davidian , Rhododendron coombense Hemsl. , Rhododendron pseudoyanthinum Balf. f. ex Hutch. , Rhododendron yanthinum Bureau & Franch. , Rhododendron yanthinum var. Lepidanthum Rehder & EHWilson .
Rhododendron concinnum belongs to the subsection Triflora from the section Rhododendron in the subgenus Rhododendron within the genus Rhododendron .
James Cullen said in 1980 " Rhododendron hutchinsonianum " from Tibet was a variety of Rhododendron concinnum , which the Flora of China does not follow in 2005 and in 2011 it is no longer in Cullen's work. The herbarium that was assigned to this species / variety is not a rhododendron at all , but a Rhodoleia species.
The variable species Rhododendron concinnum is a parent of some hybrids used as ornamental plants.
- Wu Zheng-yi, Peter H. Raven, Deyuan Hong (Eds.): Flora of China . Volume 14: Apiaceae through Ericaceae . Science Press / Missouri Botanical Garden Press, Beijing / St. Louis 2005, ISBN 1-930723-41-5 , pp. 275, 280 (English).
- ↑ a b c d e f g h i Fang Mingyuan (方明渊), Fang Ruizheng (方 瑞 征 Fang Rhui-cheng), He Mingyou (何明友), Hu Linzhen (胡琳贞 Hu Ling-cheng), Yang Hanbi (杨汉 碧) & David F. Chamberlain: Ericaceae . Rhododendron. In: Wu Zheng-Yi & Peter H. Raven (Eds.): Flora of China . Apiaceae through Ericaceae. tape 14 . Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 2005, ISBN 1-930723-41-5 , Rhododendron concinnum , pp. 280 (English, " Rhododendron concinnum - Online " - this work is online with the same text).
- ↑ a b c Fang Mingyuan (方明渊), Fang Ruizheng (方 瑞 征 Fang Rhui-cheng), He Mingyou (何明友), Hu Linzhen (胡琳贞 Hu Ling-cheng), Yang Hanbi (杨汉 碧) & David F. Chamberlain: Ericaceae . Rhododendron. In: Wu Zheng-Yi & Peter H. Raven (Eds.): Flora of China . Apiaceae through Ericaceae. tape 14 . Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 2005, ISBN 1-930723-41-5 , Rhododendron subsect. Triflora , S. 275 (English, " Rhododendron subsect. Triflora - Online " - this work is online with the same text).
- ↑ a b Hemsley 1889 scanned at biodiversitylibrary.org .
- ↑ a b Rhododendron concinnum at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed June 21, 2014.
- ↑ Rhododendron concinnum in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved June 23, 2014.
- ↑ James Cullen, Sabina G. Knees, H. Suzanne Cubey: The European Garden Flora, Flowering Plants: A Manual for the Identification of Plants Cultivated in Europe, Both Out-of-doors and Under Glass . tape 4 . Cambridge University Press, 2011, ISBN 978-0-521-76167-3 ( Rhododendron concinnum on page 317 in the Google Book Search).