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

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.

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

Independent non-profit academic organisation aiming to increase the impact and visibility of plant science across Europe. Includes news, information on membership, projects and a portal.

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

IASPRR aims to stimulate scientific research in the field of plant reproduction and related subjects and promote the application of the results of such research in agriculture and forestry. Provides information on congresses, membership and the journal.

Society presents its long history, meetings and field trips, herbarium, journal, and officers, with a membership form.

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

Organization formed to collect plants for pharmaceutical screening and research. Maintains a herbarium and issues taxonomic reports.