Wrinkled viburnum
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Wrinkled viburnum ( Viburnum rhytidophyllum ) |
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| Viburnum rhytidophyllum | ||||||||||||
| Hemsl. |
The Runzelblättrige snowball ( Viburnum rhytidophyllum ), wrinkled snowball , Runzelblatt Snowball , Evergreen snowball , tongues Snowball , Evergreen Chinese snowball , Evergreen Großblatt Snowball or Evergreen tongues Snowball called, is a plant belonging to the genus snowball ( Viburnum ) within the Belongs to the musk herb family (Adoxaceae). Their home is in China. It is used as an ornamental wood in parks and gardens.
description
Appearance and leaf
Viburnum rhytidophyllum grows as an evergreen shrub or small tree that reaches heights of up to 4 meters. The bark is gray-brownish. The branches have a bark that is densely woolly covered with yellow-whitish, yellow-brownish or red-brownish star hairs ( trichomes ) in the first year , later it is bare and has scattered small rounded lenticels . The winter buds are woolly covered with yellow-brownish or red-brownish star hairs.
The leaves, which are always opposite to each other on the branches, are divided into a petiole and a leaf blade. The robust, green, usually 1.5 to 3 (to 4) cm long petiole is densely woolly covered with yellow-whitish, yellow-brownish or red-brownish star hairs. The simple, leathery leaf blade is usually from 8 to 18 (to 25) cm in length and from (1.5 to) mostly 2.5 to 8 cm ovate-oblong to ovate-lanceolate, rarely lanceolate with rounded to slightly heart-shaped spade base and slightly pointed to blunt upper end. The leaf margin is smooth or indistinctly serrated. The leaf surfaces are initially yellow-whitish, yellow-brownish or red-brownish and the upper side of the leaf becomes intensely green. The underside of the leaf is very wrinkled and clearly reticulated. The glossy upper side of the leaf is only initially sparsely fluffy and covered with star hairs and bare. The median and lateral nerves are raised on the underside of the leaf. There is pinnate nerve with six to eight, rarely up to twelve lateral nerves. There are no stipules .
Inflorescence and flower
The flowering period begins after the new leaves have formed and extends from April to May. The strong inflorescence stem is usually 1.5 to 4 (up to 7) cm long. The terminal, umbel-like , branched, zymous inflorescence has a diameter of 7 to 12 cm and contains many flowers. The primary branching of the inflorescence usually has seven rays, which are densely woolly covered with yellow-whitish, yellow-brownish or red-brownish star hairs. The deciduous bracts are foliage-like, green, linear to linear-lanceolate and downy covered with star hairs. The cover sheets are straight. The almost sessile to short stalked flowers are located on the rays of the third order.
The relatively small, hermaphrodite flowers are radial symmetry and five-fold with a double flower envelope . The five green, 2 to 3 mm long sepals are fused tubular-bell-shaped and are covered with woolly yellow-whitish star hair. The five calyx teeth are only 0.5 to 1 mm long, triangular-egg-shaped with a blunt upper end that is somewhat ciliate, and have only sparsely fluffy star hairs. The five almost bare petals are fused into a 3 to 4 mm long corolla tube. The five with a length of 2 to 3 mm circular-egg-shaped corolla lobes with a rounded tip and smooth edge are expanded to a crown with a diameter of 5 to 7 mm. The color of the petals is predominantly white, but when budded and outside, they are pink. There is only one circle with five fertile stamens ; they tower above the corolla tube. The stamens inserted near the base of the corolla tube have a length of about 6 mm. The yellow anthers are elliptical with a length of about 1 mm wide. The stylus protrudes about the calyx teeth and ends in a cephalic scar.
Fruit and seeds
The fruits ripen between September and October and initially turn red, until they are ripe they turn black. The solitary stone fruit is 6 to 8 mm wide and elliptical with a rounded base and tip; it is bald or sparsely downy covered with star hair. With a length of 6 to 7 mm and a width of 4 to 5 mm wide, the elliptical seeds have two furrows on the back and three furrows on the belly, as well as a rounded upper end.
Chromosome number
The number of chromosomes is 2n = 18.
Occurrence
Viburnum rhytidophyllum naturally thrives in forests and bushes at altitudes between 700 and 2400 meters only in a few Chinese provinces: in Guizhou , in western Hubei , as well as in southern Shaanxi and Sichuan .
Systematics
The first description of Viburnum rhytidophyllum was made in 1888 by William Hemsley in Francis Blackwell Forbes & William Hemsley: Journal of the Linnean Society, Botany , Volume 23 (156), p 355. A synonym for Viburnum rhytidophyllum Hemsl. (sometimes Viburnum rhytidophyllum Hemsl. ex Forb. et Hemsl. ) is Callicarpa vastifolia Diels .
Two forms of the species Viburnum rhytidophyllum are known:
- Viburnum rhytidophyllum forma aureovariegatum Boom
- Viburnum rhytidophyllum forma roseum Rehder
swell
- Qiner Yang & Valéry Malécot: Viburnum . In: Flora of China Editorial Committee: Wu Zheng-yi, Peter H. Raven & Deyuan Hong (Eds.): Flora of China . Cucurbitaceae through Valerianaceae, with Annonaceae and Berberidaceae. Volume 19. Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 2011, ISBN 978-1-935641-04-9 , pp. 579 (English, Viburnum rhytidophyllum - online - online text is identical to the printed work; printed work - full text online). (Section description, distribution and systematics)
Individual evidence
- ↑ Viburnum rhytidophyllum at Tropicos.org. Missouri Botanical Garden, St. Louis
- ↑ Viburnum rhytidophyllum in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland.
Web links
- Viburnum rhytidophyllum Hemsl. In: Info Flora , the national data and information center for Swiss flora . Retrieved March 29, 2016.
- Thomas Meyer: Snowball data sheet with identification key and photos at Flora-de: Flora von Deutschland (old name of the website: Flowers in Swabia )
- Wrinkled viburnum (Viburnum rhytidophyllum) on baumkunde.de