Categories of North American plants
The variety of plants in the collection are categorized as follows:
- these include the alga, ferns, horsetails, clubmosses, spikemosses, and
- plants that have one or more permanent stems above ground and remain above
ground throughout the winter. The stems and branches have a woody core that
supports the structure of the plant. They include shrubs, bushes, and trees.
- grasslike plants, sedges usually have triangular solid stems, pointed
leaves, and flowers borne in spikelets; rushes usually have round stems,
linear leaves and inconspicuous flowers.
- plants in the family Poaceae, they have narrow leaves, small inconspicuous
flowers, and hollow stems with joints where the leaves attach.
- characterized by their usually broad leaves, these flowering plants have
green non-woody stems and many live for only one or two years.