Flora of North America: Volume 2: Pteridophytes and Gymnosperms - Google Books

https://books.google.de/books?id=VnlBQMJOi-UC

To be published in 14 volumes over the next 12 years, this long-awaited synoptic compendium represents the first and only comprehensive taxonomic guide to the extraordinary diversity of plant life blanketing our continent north of Mexico--including…