Salix dissa
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Salix dissa is a low shrub from the genus of the willow ( Salix ) with mostly 1 to 3 centimeters long leaf blades . The natural range of the species is in China .
description
Salix dissa grows as a shrub up to 1 meter high. The branches are spread out, they are short and thin, initially yellow to yellowish-brown in color, finely haired or glabrous. The leaves have a short petiole. The leaf blade is oblong, oblong-ovate to oblong-elliptical, rarely oblong-lanceolate, 1 to 3, rarely up to 4 centimeters long and 0.5 to 1.8 centimeters wide. The leaf margin is entire, the leaf base rounded, almost heart-shaped on young shoots, the leaf end pointed or blunt. The upper side of the leaf is yellowish green, rarely matt green, the underside whitish. Stipules are missing.
The male inflorescences are 2 to 4 centimeters long and 5 to 7 millimeters in diameter catkins . The inflorescence stalk is about 1 centimeter long and has three small leaves, the inflorescence axis is finely hairy. The bracts are colored brown towards the tip, broadly ovate or rounded and bare. Male flowers have an adaxial or an adaxial and an abaxial nectar gland . Two free-standing stamens are formed, the filaments are downy hairy near the base, the anthers are yellow and rounded. The female kittens are thin, 1.5 to 3 inches long and 2 to 4 millimeters in diameter. The inflorescence stalk is up to 2.5 centimeters long when the fruit is ripe and has three to five small leaves. The bracts resemble those of the male kitten. Female flowers have an egg-shaped adaxial nectar gland that is sometimes divided. The ovary is egg-shaped, bald and sitting, the stylus is short, the scar bilobed. The fruits are about 4 millimeters long, egg-shaped, elongated capsules . Salix dissa flowers with the leaf shoots early in May, the fruits ripen in June.
Distribution and ecology
The natural range is in the south of the Chinese province of Gansu , in the west of Sichuan and in the northwest of Yunnan . There the species grows near rivers, in open places and on mountain slopes at altitudes of 900 to 3000 meters.
Systematics
Salix Dissa is a kind from the kind of willow ( Salix ), in the family of the pasture plants (Salicaceae). There it is assigned to the Denticulatae section . It was scientifically described in 1916 by Camillo Karl Schneider in Plantae Wilsonianae .
There are two varieties :
- Salix dissa var. Cereifolia (Goerz ex Rehder & Kobuski) CFFang : Male flowers have only one adaxial nectar gland.
- Salix dissa var. Dissa : Male flowers have an adaxial and an abaxial nectar gland.
Individual evidence
- ↑ a b c d e Cheng-fu Fang, Shi-dong Zhao, Alexei K. Skvortsov: Salix dissa In: Flora of China. Volume 4, p. 200.
- ↑ Cheng-fu Fang, Shi-dong Zhao, Alexei K. Skvortsov: Salix Sect. Denticulatae In: Flora of China. Volume 4, p. 195.
- ↑ Salix Dissa . In: The International Plant Name Index. 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. 195, 200 (English).
Web links
- Salix dissa at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed December 28, 2014.
- Salix dissa . In:The Plant List. Retrieved December 28, 2014.