Salix dunnii
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Salix dunnii is a species in the genus of willow ( Salix ) and grows as a shrub or small tree . The leaf blades are usually 2.5 to 4 centimeters long. The natural range of the species is in China .
description
Salix dunnii grows as a shrub or small tree. Young twigs are purple, hairy downy and later bald. The leaves have a 2 to 3 millimeter long, densely hairy, glandular petiole in young leaves. The leaf blade is elliptical or elliptical-lanceolate, 2.5 to 4 inches long and 1.5 to 2 inches wide. The leaf margin is sparsely serrated to almost entire. The leaf base is broadly wedge-shaped to rounded or slightly heart-shaped, the end of the leaf bluntly rounded or pointed and usually pointed. The upper side of the leaf is finely haired, the underside white-gray, dense and pressed shaggy hairy or both sides are densely downy, white-gray or brownish hairy.
The male inflorescences are about 5 centimeters long and 4 millimeters by measuring, loosely occupied with flowers kitten . The peduncle is about 1 centimeter long and has three to five small leaves. The inflorescence axis is hairy white-gray downy. The bracts are ovate or obovate and have about a third of the length of the stamens. The base of the leaf is hairy and ciliate on both sides, the end of the leaf is pointed or slightly blunt. Male flowers have a short, conical, adaxial nectar gland and can have another three-lobed abaxial. Three to six stamens are formed, the filaments are downy hairy at the base, the anthers are egg-shaped and yellow. The female kittens are about 4 to 6.5 centimeters long when the fruit is ripe. The peduncle carries three to five sometimes six small leaves, the inflorescence axis is hairy densely downy. The bracts resemble those of the male kitten. Female flowers may have a three-lobed adaxial nectar gland that reaches about one-third the length of the stipules. The ovary is narrow egg-shaped, bald and long stalks. The stylus is short, the stigma bilobed. Salix dunnii flowers in April, the fruits ripen in May.
Distribution and ecology
The natural range is in the Chinese province of Fujian , in the north of Guangdong , in Jiangxi and Zhejiang . There the species grows near rivers.
Systematics
Salix dunnii is a kind from the kind of willow ( Salix ), in the family of the pasture plants (Salicaceae). There she is assigned to the Wilsonia section . It was first scientifically described in 1916 by Camillo Karl Schneider in Plantae Wilsonianae . Synonyms of the species are Pleiarina dunnii (CK Schneid.) N. Chao & GT Gong and Salix changchowensis Metcalf .
There are two varieties :
- Salix dunnii var. Dunnii : The underside of the leaves is white-gray, shaggy hairy when pressed tightly, the upper side is finely hairy, more dense in young leaves than in older ones
- Salix dunnii var. Tsoongii (WC Cheng) CY Yu & SD Zhao : Both sides of the leaves are dense white-gray or brown and hairy.
Individual evidence
- ↑ a b c d e Cheng-fu Fang, Shi-dong Zhao, Alexei K. Skvortsov: Salix dunnii In: Flora of China. Volume 4, p. 176.
- ↑ Cheng-fu Fang, Shi-dong Zhao, Alexei K. Skvortsov: Salix Sect. Wilsonia In: Flora of China. Volume 4, p. 171.
- ^ Salix dunnii . In: The International Plant Name Index. Retrieved December 28, 2014 .
- ^ Salix dunnii . In: The Plant List. Retrieved December 28, 2014 .
literature
- Wu Zheng-yi, Peter H. Raven (Ed.): Flora of China . Volume 4: Cycadaceae through Fagaceae . Science Press / Missouri Botanical Garden Press, Beijing / St. Louis 1999, ISBN 0-915279-70-3 , pp. 171, 176 (English).
Web links
- Salix dunnii at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed December 28, 2014.