<Li> Classis 21 . Monoecia: monoecious plants </Li> <Li> Classis 22 . Dioecia: dioecious plants </Li> <Li> Classis 23 . Polygamia: polygamodioecious plants </Li> <Li> Classis 24 . Cryptogamia: the "flowerless" plants, including ferns, fungi, algae, and bryophytes </Li>

Linnaean system of plant classification is based on