Salix eriostachya
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| Salix eriostachya | ||||||||||||
| Wall. ex Andersson |
Salix eriostachya is a species from the genus of willows ( Salix ) and grows as a shrub . The leaf blades are 4 to 11 centimeters long. The natural range of the species is in India, Nepal and China.
description
Salix eriostachya grows as a shrub. The branches are black or dark brown, bare or almost bare. The buds are finely hairy. The leaves have a petiole about 1.3 centimeters long and hairy on the upper side. The leaf blade is oblong, obovate or lanceolate, 4 to 11 inches long and 1.5 to 3 inches wide. The leaf margin is dentate with entire or distant glands, the base of the leaf is wedge-shaped to broadly wedge-shaped, the end of the leaf is pointed to short. The upper side of the leaf is dark green, the underside greenish. Both sides are initially downy or shaggy and later balding. The leaf veins protrude from the underside of the leaf. 15 to 20 lateral wire pairs are formed per leaf. The network-like veins are only vaguely pronounced. The stipules are ovate, about 1 millimeter long, glabrous and toothed.
The inflorescences are about 3.5 centimeters long and 6 millimeters in diameter catkins . The peduncle is about 2.5 inches long and has small leaves. The inflorescence axis is velvety. The bracts are obovate, 2 to 3 millimeters long and hairy downy. The leaf margin is whole or cut out. Male flowers have an egg-shaped, approximately 0.5 millimeter long adaxial and a very small abaxial nectar gland . Two separate stamens are formed with stamens with downy hair at the base. The anthers are yellow. The fruiting, female kittens are about 9 centimeters long with a diameter of about 1.5 centimeters. Female flowers usually have two nectar glands, although the abaxial one may be missing. The adaxial gland is broadly ovate and about 0.5 millimeters long. The ovary is sessile and hairy white shaggy. The stylus is 2 millimeters long and divided into two parts. The scar is linear and divided. The fruits are narrow, egg-shaped, about 6 millimeters long and finely hairy capsules . Salix eriostachya blooms in June, the fruits ripen from July to August.
Distribution and ecology
The natural range is in India, in Nepal, in the Chinese provinces of Sichuan and Yunnan and in the autonomous region of Tibet . There it grows in the mountains at heights of 3000 to 5000 meters.
Systematics
Salix eriostachya 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 1851 , the description based on an invalid one by Nathaniel Wallich . Representatives of the species are attributed by some botanists to the species Salix ernestii .
The Flora of China indicates two varieties:
- Salix eriostachya var. Eriostachya : The ovary is sessile, the inflorescence stalk about 2.5 centimeters long and the bracts 2 to 3 millimeters long.
- Salix eriostachya var. Lineariloba (N. Chao) G. Zhu : The ovary has a short stalk, the catkins are almost sessile and the bracts are about 1.5 millimeters long.
According to The Plant List , a third variety is distinguished:
- Salix eriostachya var. Angustifolia (CF Fang) N. Chao
Individual evidence
- ↑ a b c d e f g h Cheng-fu Fang, Shi-dong Zhao, Alexei K. Skvortsov: Salix eriostachya In: Flora of China. Volume 4, p. 229.
- ↑ Cheng-fu Fang, Shi-dong Zhao, Alexei K. Skvortsov: Salix Sect. Psilostigmatae In: Flora of China. Volume 4, p. 226.
- ↑ Salix eriostachya . In: The International Plant Name Index. Retrieved March 20, 2015 .
- ↑ Salix eriostachya . In: The Plant List. Retrieved March 20, 2015 .
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, 229 (English).
Web links
- Salix eriostachya at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed March 20, 2015.