Mushketov [1850-1902 ]) Cardium edule, Dreissena polymorpha, Neritina liturata, Adacna vitrea, Hydrobia stagnalis, in the Kara-kum desert, and Lithoglyphus caspius, Hydrobia stagnalis, Anodonta ponderosa and the sponge Metchnikovia tuberculata, in the Kizilkum desert.
The mountain valleys are covered with little except grasses; on the higher parts of the mountains there are barren rocks or only a scant growth of timber; but many of the lower mountain slopes, especially those along the western border, are clothed with heavy timber, ponderosa pine, lodgepole pine, Douglas-fir and western larch being the principal species.
Other peculiar trees prized for their wood are: the kauila (Alphitonia ponderosa), used for making spears, mallets and other tools; the kela (Mezoneuron kauaiense), the hard wood of which resembles ebony; the halapepe (Dracaena aurea), out of the soft wood of which the natives carved many of their idols; and the wiliwili (Erythrina monosperma), the wood of which is as light as cork and is used for outriggers.
P. ponderosa, the yellow pine of the Pacific coast of America, belongs to this section; it is a fine timber tree deserving of notice from the extreme density of its wood, which barely floats in water; it abounds in some parts of the western range of the Rocky Mountains, and is the most widely distributed pine tree of the mountain forests of western North America.
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