Download or read book Gymnosperms of the United States and Canada written by Elray S. Nixon and published by . This book was released on 2010 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains a key for the identification of the gymnosperms of the United States and Canada relying as much as possible on stem, leaf and cone characters. Because gymnosperms are usually evergreen, these characters are generally available throughout the year. Illustrations of species and plant characters are included to help with the identification process.