USGS Home
Contact USGS
Search USGS
USGS Thesaurus and Science Topics Catalog
Categories
>
Topics
>
Organisms
>
Plants (organisms)
>
Nonvascular plants
Help
Liverworts and hornworts
Simple green land plants of the phyla Bryophyta with leaves and a stem and always without roots.
Subtopics:
(none)
Related topics:
Botany
Mosses
Search for topic: