If you don't know what family your plant is in, try looking up a plant you know that has a similar-looking flower and browse through that family; yours may be a close relative. Or check out the resources below:
- Field identification of the 50 most common plant families in temperate regions (Lena Struwe @ Rutgers University).
- World Wide Flowering Plant Family Identification (Colby College).
- FloraGator (University of Florida).