- American Society of Plant Biologists
- Professional organization aims to promote the growth and development of plant sciences.
- Australian Systematic Botany Society
- Incorporated association of botany professionals and amateurs created to promote the study of plant systematics.
- Botanical Society of America
- Nonprofit scientific organization representing professional botanists, plant scientists, educators, students, and amateur plant science enthusiasts. Official website presents news, bulletins, announcements, and information on membership and activities.
- Botanical Society of the British Isle
- Contains links and information for those interested about the flowers of Britain and Ireland.
- California Botanical Society
- Group dedicated to advancing western American botany. Publishes research articles, notes, and information on various aspects of botany.
- European Plant Science Organization (EPSO)
- Overview of EPSO with information on membership, organization objectives, projects, conferences, and other activities.
- Front Range Seed Analysts
- Organization of professional seed analysts, associates, and students involved in seed testing, production, or trade. Aims to inform, educate, and support those engaged in seed study, production, and commerce.
- International Association for Plant Taxonomy (IAPT)
- Organization established to carry out projects of interest and concern to systematic biologists and to promote all aspects of botanical systematics.
- International Association of Sexual Plant Reproduction Research (IASPRR)
- Aims to promote scientific research in plant reproduction and related subjects for the benefit of agriculture and forestry.
- International Organization for Plant Information
- Group founded by botanists and computer scientists. Aims to provide a series of computerized databases that summarize taxonomic, biological, and other information about plants from different parts of the world.
- Philadelphia Botanical Club
- Aims to further interests in botany and to make a checklist and herbarium of plants found in nearby areas of Philadelphia.
- Society for Economic Botany
- Organization seeking to foster research and education on the human use and consumption of plants. Site presents news, publications, and membership details.
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