Betula alnoides
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Illustration by Betula alnoides from Dietrich Brandis ' Illustrations of the Forest Flora of North-West and Central India , 1874 |
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| Buch.-Ham. ex D.Don |
Betula alnoides is a plant from the genus of birch ( Betula ) in the family of birch family (Betulaceae). Their home is in parts of South, East and Southeast Asia.
description
Vegetative characteristics
Betula alnoides grows as a deciduous tree that can reach heights of up to 30 meters. The gray bark peels off in layers. The resinous bark of the branches is densely covered with white shaggy hair.
The alternate leaves arranged on the branches are divided into a petiole and a leaf blade. The densely shaggy hairy and glandular petiole has a length of 1.5 to 4 centimeters. The simple, paper-like leaf blade is lanceolate, ovoid-lanceolate to ovoid-elliptical, with a length of 4 to 12 centimeters and a width of 2.5 to 5.5 centimeters, with wedge-shaped, broadly wedge-shaped or rounded to rarely even approximately heart-shaped Spider base and pointed or tailed spreader tip. The irregularly inwardly curved edges of the spread are sawn like a bristle. The upper side of the leaf is glabrous, while the underside of the leaf is densely covered with glands and sparsely hairy along the leaf veins . 10 to 13 leaf veins branch off from each side of the leaf central nerve.
Generative characteristics
Betula alnoides is single sexed ( monoecious ) and the flowering period extends at least in China from March to May. Kittens are formed as inflorescences . The racemose female inflorescences consist of three to five pendulous catkins. The female kittens stand on a stalk that is densely covered with yellow hair, 0.2 to 0.3 centimeters long and are approximately cylindrical in shape with a length of 5 to 10 centimeters and a thickness of 0.4 to 0.6 centimeters. The densely hairy and ciliate bracts are triple lobed and about 0.3 centimeters in size.
The fruits ripen from October to January, at least in China. Solitary nut fruits , so-called wing nuts, are formed. The wing nuts are oval-shaped with a diameter of 1.5 to 2 millimeters and have membrane-like wings that are about twice the size of the actual fruit. The fruits are sparsely hairy at the top.
Chromosome number
The number of chromosomes is 2n = 28.
Occurrence
The natural range of Betula alnoides includes parts of South, East and Southeast Asia . It stretches from India , Nepal and Bhutan via Myanmar and central and southeast China to Thailand and Vietnam . In China, the distribution area extends over Fujian , Guangxi , Hainan , Hubei , Sichuan and southern Yunnan .
Betula alnoides thrives in China in subtropical rainforests at altitudes of 700 to 2100 meters.
Systematics
It was first described as Betula alnoides in 1825 by Francis Buchanan-Hamilton in Prodromus Florae Nepalensis , page 58. Synonyms for Betula alnoides Buch.-Ham. ex D.Don are Betula acuminata Wall. and Betulaster acuminata (Wall.) Spach .
swell
- Pei-chun Li, Alexei K. Skvortsov: Betulaceae . Betula. In: Wu Zheng-Yi, Peter H. Raven (Ed.): Flora of China . Cycadaceae through Fagaceae. Volume 4. Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 2011, ISBN 978-1-935641-07-0 , Betula alnoides Buchanan-Hamilton ex D. Don , p. 306 (English, " Betula alnoides - Online " - this work is online with the same text). (Sections Description, Occurrence and Systematics)
Individual evidence
- ↑ a b c d e f g Pei-chun Li, Alexei K. Skvortsov: Betulaceae . Betula. In: Wu Zheng-Yi, Peter H. Raven (Ed.): Flora of China . Cycadaceae through Fagaceae. Volume 4. Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 2011, ISBN 978-1-935641-07-0 , Betula alnoides Buchanan-Hamilton ex D. Don , p. 306 (English, " Betula alnoides - Online " - this work is online with the same text). (Sections Description, Occurrence and Systematics)
- ↑ Betula alnoides at Tropicos.org. Missouri Botanical Garden, St. Louis. Retrieved November 1, 2017.
