An illustrated flora of the northern United States and Canada : from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian / by Nathaniel Lord Britton and Addison Brown
v. 1. Ophioglossaceae to Polygonaceae; ferns to buckwheat -- v. 2. Amaranthaceae to Loganiaceae; amaranth to polypremum -- v. 3. Gentianaceae to Compositae; gentian to thistle.