Rhododendron williamsianum
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Rhododendron williamsianum |
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| Rehder & EHWilson |
Rhododendron williamsianum is a plant from the genus of Rhododendron ( Rhododendron ) in the family of the Ericaceae (Ericaceae). It is common in southwest China.
description
Appearance and foliage leaf
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Rhododendron williamsianum grows as an evergreen shrub that can reach heights of 1 to 2 meters. Older branches have a bald, brownish bark . The slender branches with a diameter of 0.3 to 0.5 centimeters have a bark that is initially greenish to slightly purple and has a few glands.
The alternate leaves are arranged in a petiole and a leaf blade. The sparsely hairy leaf stalk is 1 to 1.5 centimeters long and has a flat top and a rounded bottom. The simple and leathery leaf blade is 2.5 to 5 centimeters long and 2 to 4 centimeters wide, ovoid to approximately circular. The base of the spade is heart-shaped to approximately rounded, the upper end is rounded and ends in a small point. The upper side of the leaf is bare and dark green, the underside is greyish-white. On both sides of the leaf, the midrib and the eleven to twelve pairs of lateral nerves are raised. The leaf veins can be clearly seen on the underside of the leaf.
Inflorescence and flower
The flowering period extends in the natural range from April to May. The umbelliferous inflorescence contains two to six flowers. The 5 to 8 millimeter long inflorescence axis is sparsely hairy glandular. The strong flower stalk, which is covered with long glandular hairs, is 2 to 3 centimeters long.
The hermaphrodite flowers are five or sixfold with a double flower envelope . The six sepals with short glandular hairs on the outside and the edges form a disc-shaped calyx that ends in 1 to 2 millimeters long, broadly triangular calyx teeth. The five or six 3.5 to 4 centimeters long and 4 to 4.5 centimeters wide petals are broad, bell-shaped fused and reddish in color. The approximately circular and sanded corolla lobes are 1 to 1.5 inches long and about 2 inches wide. The 10 to 14 unequal stamens are between 1.8 and 3 centimeters long. The stamens are glabrous, and the dark reddish-purple anthers are egg-shaped. The bald ovary is egg-shaped with a diameter of about 0.5 centimeters. The stylus, which is usually bald, is approximately 3.5 centimeters long and almost as long as the petals and ends in a cephalic scar .
fruit
When ripe, the bald capsule fruits are cylindrical with a length of 1.5 to 2.5 centimeters and a diameter of about 0.6 centimeters. The capsule fruits ripen in China from August to September.
Occurrence
The natural range of Rhododendron williamsianum is in the Chinese provinces of western Guizhou , southwestern Sichuan , northeastern Yunnan and in southeastern Tibet Autonomous Region . Rhododendron williamsianum thrives in open forests, on mountain slopes and on rocks at altitudes of 1,800 to 2,800 meters.
Systematics
Rhododendron williamsianum belongs to the Williamsiana subsection from the Ponticum section in the Hymenanthes subgenus within the Rhododendron genus .
The first description of Rhododendron williamsianum was made in 1913 by Alfred Rehder and Ernest Henry Wilson in Plantae Wilsonianae to enumeration of the woody plants collected in western China for the Arnold Arboretum of Harvard University during the years 1907, 1908 and 1910 by EH Wilson edited by Charles Sprague Sargent , Volume 1, Page 538.
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use
Varieties of Rhododendron williamsianum are used as an ornamental plant in parks and gardens in the temperate latitudes .
Rhododendron williamsianum is involved in many hybrids with other species.
swell
- 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 williamsianum , pp. 346 (English, efloras.org - this work is online with the same text).
Individual evidence
- ↑ a b c d e f g 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 williamsianum , pp. 346 (English, efloras.org - this work is online with the same text).
- ↑ 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. Williamsiana , S. 325 (English, efloras.org - this work is online with the same text).
- ^ A b Rhododendron williamsianum in Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved July 12, 2014.
- ^ Rhododendron williamsianum at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed July 11, 2014.
- ↑ Gordon Cheers (Ed.): Botanica. The ABC of plants. 10,000 species in text and images . Könemann Verlagsgesellschaft, 2003, ISBN 3-8331-1600-5 , p. 747 .
- ↑ Data sheet with information on hybrids in which Rhododendron williamsianum is involved and photos of the range of flower colors of the Rhododendron williamsianum varieties at The Hirsutum-project of the Nederlandse Rhododendron Vereniging.
