An organization devoted to the scientific study of all aspects of the biology of bryophytes and lichen-forming fungi.

To promote the growth and development of plant biology, to encourage and publish research in plant biology, and to promote the interests and growth of plant scientists in general

homepage for Australian systematic botany society, news, conferences and publications.

Promoting research and teaching in all fields of plant biology to facilitate cooperation among plant scientists worldwide and to disseminate knowledge of plants, algae and fungi. Links to the American Journal of Botany, Plant Science Bulletin, national meetings and symposia, and educational resources.

Founded in 1836, it is the major source of information on the status and distribution of British and Irish flowering plants and ferns.

Systematics, ecology, evolution, and natural history of the plants of California and adjacent western North America. Publisher of the journal Madroño.

Carries out projects of interest to systematists, especially those that require international cooperation.

The group's purpose is to promote research and education in vegetation science as well as to facilitate scientific and personal contacts among vegetation scientists of all countries.

Organization for professional and amateur botanists interested in the flora of the Southern Appalachian Mountains. Includes tables of contents for the journal Castanea.