Dwarf Birch

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Dwarf Birch

 

(Betula nana), a plant in the birch family. It is a low shrub, 20–70 cm high, rarely reaching 1.5 m. The leathery leaves are round, have short stalks, and have blunt-toothed edges; they reach 2 cm in width and have a dense and sharply projecting system of veins on the bottom side. Dwarf birches form vast thickets in arctic and cold regions. In forest zones, they grow in swamps. In the USSR they are encountered primarily in the north, reaching the Enisei River in the east. The leaves of the dwarf birch serve as food for deer, and the wood is used as fuel. Closely related to this species are the shrubs B. exilis, B. rotundifolia, and B. middendorffii.

REFERENCE

Arkticheskaia flora SSSR, issue 5. Moscow-Leningrad, 1966.

A. P. SHIMANIUK

References in periodicals archive ?
Betula nana, Betula nana-type or they are included into a general category of Betula pollen.
Some of the most interesting macrofossils found in the sediments of this area are the remains of cold-tolerant Betula nana L.
Jundzill indicated: "We found very rare species and species which have never been found before, such as Callitriche intermedia, Circaea alpina, Circaea intermedia, Calamagrostis schleicheri, Koeleria cristata, Sesleria caerulea, Scirpus caricinus, Primula farinosa, Salsola kali, Chenopodium villosum, Ribes alpinum, Swertia perennis, Lunaria rediviva, Alyssum montanum, Cakile maritima, Dentaria bulbifera, Taxus baccata, Betula nana, Myrica and many other cryptogams".
Evidently, the planet is some size and despite the acreage of small leaved Betula nana consumed by reindeer, the fellow in the pillar box red tunic wouldn't finish his shift were it not for those generous helpers that parents, aunts and uncles, brothers and sisters, so visibly are.
The pollen production of local taxa is very low, among which Betula nana, Salix, Selaginella selaginoides, Dryas octopetala and steppe xerophytes Eurotia ceratoides, Ephedra and halophilous taxa Kochia prostrata, Salsola kali and Salicornia herbaceae have been identified (Pirrus 1971).
Unfortunately, in our diagram, the pollen of Betula nana and the other Betula species have not been calculated separately.
Pollen assemblages recovered from periglacial middle Jarva layers of the Toravere, Valguta, Savala, and other sections were interpreted by Liivrand (1991, 1999) as evidence of cold environments with wide-spread tundra and xerophytic communities dominated by Betula nana, Artemisia, Chenopodiaceae, Poaceae (Gramineae), and Cyperaceae.