Plant Societies

Rotorua Botanical Society
http://www.wildlands.co.nz/company/rotorua-botanical-society/

Wellington Botanical Society
http://www.wellingtonbotsoc.org.nz/

New Zealand Society of Plant Biologists (formerly the society of Plant Physiologists)
https://plantbiology.science.org.nz/

New Zealand Plant Conservation Network
http://www.nzpcn.org.nz/

SYSTANZ (Systematics Association of New Zealand)
http://www.math.canterbury.ac.nz/bio/SYSTANZ/index.html

New Zealand Ecological Society
https://newzealandecology.org/

Universities with strong botany programs

Massey University (including the Allan Wilson Centre for Molecular Ecology and Evolution – one of seven Centres of Research Excellence funded by the government)
http://www.massey.ac.nz/
http://www.allanwilsoncentre.ac.nz/

University of Otago
http://www.otago.ac.nz/

University of Canterbury
http://www.canterbury.ac.nz/

Victoria University
https://www.victoria.ac.nz/

University of Auckland
http://www.auckland.ac.nz/

Crown Research Institutes

Landcare Research (systematics and ecology of native NZ flora and fauna)
http://www.landcareresearch.co.nz/

The New Zealand Institute for Plant and Food Research (applied research of horticultural plants/fruit crops)
https://www.plantandfood.co.nz/

AgResearch (applied research of agricultural plants important to NZ)
http://www.agresearch.co.nz/

Journals

New Zealand Journal of Botany, published by the Royal Society
https://www.tandfonline.com/loi/tnzb20

New Zealand Journal of Ecology, published by the New Zealand Ecological Society
https://newzealandecology.org/nzje