Guide To Rocky Mountain Plants, Revised

A completely revised edition of Williams''s previous work with the late Ruth Ashton Nelson, Handbook of Rocky Mountain Plants, this edition uses simple and clear keys to identify more than 350 species of plants found in the Rocky Mountain region from the United States to Canada. Useful in the classroom as well as the field, the new edition also contains seventy-two color plates of popular species in addition to over 350 line drawings.