Some general info on the plant kingdom... & ... info about bryophytes & seedless vascular plants.

The Plant Kingdom The systems of classification of the plant kingdom vary in naming and placing the larger categories (even the divisions) because there is little reliable fossil evidence, as there is in the case of animals, to establish the true evolutionary relationships of and distances between these groups. However, comparisons of nucleic acid sequences in plants are now serving to clarify such relationships among plants as well as other organisms. A widely held view …

…a wide range of habitats but usually growing beneath other plants. They have rhizomes from which arise adventitious roots; the stems are clothed in microphylls. Sporangia may be spread all over the plant or they may be clustered in a cone-like strobilus. Lycopodium is used by florists to some extent as a foliage plant. Running pine is sometimes classified as Diphasiastrum rather than Lycopodium and can be used as a ground cover in the landscape.