Purchase Botanical Cards
http://www.illustrata.com.au/ranges/botanical_press

American Society of Botanical Artists
http://huntbot.andrew.cmu.edu/ASBA/

Botanical Art Society of Australia
http://www.botanicalartsocietyaustralia.com

The Art of Botanical Illustration (Melbourne): http://www.rbg.vic.gov.au/support_us/RBG_support_groups/friends_melbourne