This is a US government publication.
This group features a "Wood of the Month".
The US Forest Service publication 654.
A booklet published by the Delaware Dept of Agriculture,
listing the biggest trees of many species in Delaware.
In Acrobat format. I have extracted the information into
an Excel spreadsheet
A web site comprising images of all types of plants
A web page from the Florida Extension describing various
types of scarification and stratification. Most relevant
to Florida species, but does describe acid