Colorado flora: Western slope by William Alfred Weber, Ronald C. Wittmann

By William Alfred Weber, Ronald C. Wittmann

This advisor, meant either for the coed and scientist, bargains a whole, authoritative connection with the crops of Colorado. It discusses plant geography, specified botanical positive factors of the mountain levels, basins and plains, and clarify simple terminology. attention-grabbing anecdotes and introductions are given for every plant kin, and tricks on recognising the biggest households are supplied besides. each one quantity features a entire word list, indices to universal and particular names, and countless numbers of illustrations. This and its significant other quantity, were considered as the main entire courses on hand and are necessary to readers attracted to Colorado's flowers.

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The high country includes the main Rocky Mountain chains near the Continental Divide, the Elk and West Elk Mountains, the San Juan Volcanic region, and several great plateaus: White River, Blue Mountain, Grand Mesa, Blue Mesa, Cochetopa and Uncompahgre. " Contrary to common usage, the Rocky Mountains, strictly speaking, do not occupy most of the Western Slope. The region is one of long, deeply excavated river valleys: The Green, Yampa, and White in the northern third; the Colorado (or Grand, as it has been called) and the Gunnison and Eagle in the central third; and the San Juan and Animas in the southern third.

Lower left: River systems: A, Yampa, Little Snake and Green; B, White; C, Colorado; D, Gunnison; E, Dolores; F, San Juan. ; 12, Mesa Verde National Park; 13, Four Comers; 14, Park Range, 15, Rabbit-ears Range; 16, Front Range; 17, Mosquito/Ten Mile Range; 18, Sawatch Range; 19, Cochetopa Range. Page xvi Acrolasia humilis, Abronia argillosa, Camissonia eastwoodiae, and C. walkeri. In exceptional years, masses of the white-flowered Stanleya albescens cover great expanses of alkaline flats. Dividing the Colorado from the Gunnison River drainage loom the cliffs of the Grand Mesa, a huge, almost level plateau covered by a subalpine forest with many small lakes and wet meadows.

Relatively few high mountain species fall in this class; Gilia sedifolia is one; narrow endemics are more characteristic of lower altitudes, arid climates, and special substrates. Disjunct genera and species are very important in the mountain flora. some of these must be very ancient survivors of the Tertiary Period long before Pleistocene glaciation. Most of our disjunct species are absent between Colorado and the Canadian Rockies, Alaska, Eastern Asia or the Middle Asiatic Altai mountains; Ptilagrostis and Leucopoa are such examples.

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