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==Non-vascular versus vascular==
==Non-vascular versus vascular==
Vascular plants - including both those that flower and those that don't have great diversity, since their adaptable root and shoot systems have given them the ability to grow in many habitats. Some, like ferns, reproduce by means of spores, which is how non-vascular plants reproduce as well, but the vast majority (over 250,000 species) reproduce by seed. Non-vascular plants are primitive types such as liverworts and mosses, which lack conductive tissue to circulate water and nutrients. This limits them to moist environments. Widespread in the wild, but of limited value in gardens due to their smaller size and somewhat dull appearance.
==Plants that bear seed==
==Plants that bear seed==
Vascular plants that do bear seed are divided into gymnosperms ("naked seed") and angiosperms (meaning "covered seed"). Gymnosperms produce seed which are only partly enclosed by tissues from the parent plant. Conifers normally bear seed on the scales of the cones they produce, and form the largest family, which includes some 550 species. Many, like the pines (Pinus) and spruces (Picea) are very tolerant of heat, cold, or drought, which makes them very important, horticulturally. Other gymnosperms under cultivation include cycads and ginkgos.
==Lifespan==
==Lifespan==
Flowering plants are divided by life span into the following categories: annuals, biennials and perennials. Annuals live for one season of growth. Biennials live for two seasons, usually using the first to produce foliage and gather food reserves, and the second season usually comprises flowering and fruiting before dying. Perennials live for several seasons, usually flowering each year once established. Some perennials have been known to live thousands of years.
==Plant classification and nomenclature==
==Plant classification and nomenclature==
==Species, hybrids and cultivars==
==Species, hybrids and cultivars==
==Monocots and dicots==
==Monocots and dicots==
