Primula Sections - American Primrose Society - Good descriptions of each Primula section and its main characteristics with a note of the species in each section (and seed cultivation notes) www.backyardgardener.com/apsseed.html
Primula species photographs - Good quality photographs from the University Durham Botanic Gardens of a number of Primula species www.dur.ac.uk/~deb0www/dubg/bgabcde.html
Primula x polyantha - example of heterostylous flouwers - image www.botany.hawaii.edu/faculty/carr/images/pri_pol_het.jpg
