Salix daltoniana
| Salix daltoniana | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Salix daltoniana | ||||||||||||
| Andersson |
Salix daltoniana is a shrub or small tree from the genus of willow ( Salix ) with mostly 4.5 to 9 centimeters long leaf blades . The natural range of the species is in India , Nepal , Bhutan and in Tibet .
description
Salix daltoniana grows as a shrub or small tree . The twigs are initially black-purple and sparsely hairy. The buds are egg-shaped, shorter than 1 centimeter and sometimes frosted. The leaves have a petiole about 1 centimeter long. The leaf blade is lanceolate, oblong or elliptical, 4.5 to 9 inches long and 1.5 to 2.5 inches wide. The leaf margin is serrate or seldom indistinctly glandular, the leaf base is wedge-shaped to rounded, the leaf end pointed. The upper side of the leaf is dull green, initially sparsely hairy down and later glabrous or only downy hairy along the veins. The underside is dense lead-gray, silky hairy and shiny. The central vein is clearly formed on the upper side of the leaf, the veins are inconspicuous on the underside. Usually 11 to 14, rarely up to 16 pairs of side veins are formed.
Male inflorescences are cylindrical, 3.5 to 6 centimeters long and 8 to 10 millimeters in diameter catkins . Two to five small leaves are formed on the peduncle. The bracts are yellowish brown, spatulate-elongated, entire, notched or split and have a blunt or almost truncated end. Male flowers have 4 to 5.5 millimeters long, downy-haired stamens at the base . The anthers are yellow and elongated. Female kittens are 4 to 6, rarely up to 7 centimeters long and have a diameter of 5 to 6, with fruit ripe up to more than 10 millimeters. The bracts resemble those of the male kittens. Female flowers have an adaxial nectar gland that is about a third the length of the bracts . The ovary is egg-shaped and densely hairy daunig. The pen is about as long as the ovary and bilobed. The scar is purple and split. The fruits are egg-shaped-conical, finely hairy or bald, tapering, sitting or short-stalked capsules . Salix daltoniana flowers from May to June when the leaves shoot, the fruits ripen in July.
Distribution and ecology
The natural range is in Bhutan, India (among other things in Sikkim ), Nepal and in the autonomous region of Tibet . In Tibet they can be found in thickets and on mountain slopes at heights of 3000 to 4400 meters.
Systematics
Salix daltoniana is a kind from the kind of willow ( Salix ), in the family of the pasture plants (Salicaceae). There it is assigned to the Psilostigmatae section . It was scientifically described by Nils Johan Andersson in the Journal of the Proceedings of the Linnean Society in 1859 . Synonyms are not known.
Salix daltoniana is similar to Salix balfouriana and Salix ernestii , but differs from them by the densely lead-gray, silky hairy and shiny underside of the leaves, the indistinct veins on the underside of the leaf and the non-twisted styluses and stigmas.
Individual evidence
- ↑ a b c d e Cheng-fu Fang, Shi-dong Zhao, Alexei K. Skvortsov: Salix daltoniana In: Flora of China. Volume 4, p. 233.
- ↑ Cheng-fu Fang, Shi-dong Zhao, Alexei K. Skvortsov: Salix Sect. Psilostigmatae In: Flora of China. Volume 4, p. 226.
- ^ Salix daltoniana . In: The International Plant Name Index. Retrieved December 26, 2014 .
- ^ Salix daltoniana . In: The Plant List. Retrieved December 26, 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. 226, 233 (English).
Web links
- Salix daltoniana at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed December 26, 2014.