Salix balfouriana
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Salix balfouriana is a shrub or small tree from the genus of willow ( Salix ) with reddish black and tomentose hairy young twigs and up to 8 leaf blades, rarely 18 centimeters long. The natural range of the species is in China.
description
Salix balfouriana is a shrub or tree up to 5 meters high with reddish black and tomentose hairy young twigs. Biennial twigs are glabrous or slightly hairy. The buds are black-brown and also finely hairy. The leaves have a 1 to 1.5 centimeter long, finely hairy stem. The leaf blade is 6 to 8, rarely 12 inches long and 2 to 4 inches wide. On young shoots, lengths of up to 18 centimeters are seldom reached. The blade is elliptical, elliptically elongated or obovate-elongated, with a pointed or blunt tip, rounded or broadly wedge-shaped base and entire or glandular serrated leaf margin. The upper surface of young leaves is rusty brown and tomentose, while older leaves are glabrous and whitish. The underside is dark green, glabrous or downy hairy along the leaf veins . Fallen leaves from the previous year are gray-brown.
Male inflorescences are 2 to rarely 4 centimeters long and 6 to 10 millimeters in diameter catkins are formed. The peduncle is short or absent and may have one or two small leaves at the base. The bracts are obovate-oblong, with a rounded, truncated or notched tip. The upper side of the leaf is bald or slightly hairy, the underside is reddish yellow at the tip, hairy and ciliate. Male flowers have an adaxially and an abaxially arranged nectar gland . The two free-standing stamens have almost completely finely haired stamens and yellow or rarely red anthers. Female inflorescences are up to 8 inches long and have an elongated stem. The female flowers have an adaxial nectar gland. The ovary is sessile, ovate-conical, pubescent and reddish purple. The stylus is long and two-lobed, the scar is in two columns. The fruit forms 5.5 millimeters long, almost bare capsules . Salix balfouriana flowers before or at the same time as the leaves shoot from April to May, the fruits ripen in June and July.
Occurrence and location requirements
The natural range is in thickets and on mountain slopes at altitudes of 2800 to 4000 meters in the Chinese province of Sichuan and in the northwest of the Chinese province of Yunnan .
Systematics
Salix balfouriana 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 described scientifically for the first time in 1936 by Camillo Karl Schneider . The generic name Salix comes from Latin and was already used by the Romans for various types of willow.
proof
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, 231 (English).
- Helmut Genaust: Etymological dictionary of botanical plant names. 3rd, completely revised and expanded edition. Nikol, Hamburg 2005, ISBN 3-937872-16-7 (reprint from 1996).
Individual evidence
- ↑ a b c d Cheng-fu Fang, Shi-dong Zhao, Alexei K. Skvortsov: Salix balfouriana , in the Flora of China , Volume 4, p. 231
- ↑ a b Salix balfouriana . In: Germplasm Resources Information Network (GRIN). United States Department of Agriculture, accessed September 3, 2012 .
- ↑ Cheng-fu Fang, Shi-dong Zhao, Alexei K. Skvortsov: Salix Sect. Psilostigmatae , in the Flora of China , Volume 4, p. 226
- ↑ Exactly: Etymological Dictionary of Botanical Plant Names , p. 552
Web links
- Salix balfouriana . In:The Plant List. Retrieved September 3, 2012.