The American Begonia Society serves as the international registration authority for the many species of begonia. The society maintains a list of up to 1,000 detailed listings for begonia species. Botanists divide begonias into eight horticultural classifications.
Cane-like begonias possess a hardy stem, similar to bamboo. Cane begonias can grow up to 12 feet tall with leaves up to 14 inches long.
The American Begonia Society calls rex begonias the "showboats of the begonia world." Known among begonia aficionados for showy leaves in a variety of colors, these begonias grow into diverse sizes and shapes.
The shrub and thick-stemmed begonias hold the distinction as the least well-known types of begonia, according to the American Begonia Society. The shrub type offers gardeners an easy-growing begonia with eye-catching leaf shapes. Thick-stemmed begonias come in a wide variety of styles but tend to grow low along the ground.
Rhizomatous begonias grow from roots that creep shallowly along the ground, preventing the spring-flowering plant from growing tall.
Gardeners can easily identify the semperflorens begonia from the waxy appearance on the leaves. This type of begonia flowers continually with blooms in red, pink or white.
The tuberous begonia features prominent, colorful flowers. Trailing-scandent begonias climb along trees or fence lines and bloom profusely in the spring.