Journals
Adansonia, American Journal of Botany., Annales Botanici Fennici, Annals of Botany, Arctoa, Australian Journal of Botany, Australian Systematic Botany, Botanical Journal of the Linnean Society, Edinburgh Journal of Botany, Electronic Sites of Botany, Plant Biology and Scie
Illustrated Guide to Arizona Weeds
Online version of the book by Kittie F. Parker.