Pacific Northwest Ferns and Their Allies
Although the ferns and their allies are a small group of about 10,000 species compared to the 275,000 species of seed plants, their lineage is a long and noble one going back to the carboniferous period 300 million years ago when they were the dominant form of plant life in the swap-forests.
Ninety-seven species of attractive group of plants are described in this this column, about one-quarter of ...
Although the ferns and their allies are a small group of about 10,000 species compared to the 275,000 species of seed plants, their lineage is a long and noble one going back to the carboniferous period 300 million years ago when they were the dominant form of plant life in the swap-forests.
Ninety-seven species of attractive group of plants are described in this this column, about one-quarter of ...
