Flora of North America, Volume 22, is the first of five volumes covering monocots in North America north of Mexico. The volume comprises many groups of aquatic plants and the North American relatives of groups that have their richest number of species in the New World tropics. Included among the treatments are the rush family (Juncaceae), which include important indicator species in wetland habitats, the cat-tails (Typhaceae), spiderworts (Commelinaceae,), aroids (Araceae), and pondweeds (Potamogetonaceae). Thirty families are included in this volume, representing a diverse range of plant forms - from marine Zosteraceae (eel-grasses) to stately Arecaeae (palms) and the naturalized exotic Zingiberaceae (gingers). Heliconiaceae (heliconias) and Musaceae (bananas).

Flora of North America, Volume 4, will be the second volume of nineteen on dicotyledons to be published in the Flora of North America series. It treats 892 species in 124 genera and ten families (Phytolaccaceae, Achatocarpaceae, Nyctaginaceae, Aizoaceae, Cactaceae, Chenopodiaceae, Amaranthaceae, Portulacaceae, Basellaceae, and Molluginaceae). Each of the included species is illustrated with a line drawing that, in combination with the key and descriptions, will facilitate identification of this economically important group of plants.

• More than 650 species classified in 117 genera and 10 families of the order Caryophyllales
• Features:
• DT Extensively reviewed entries, which include identification keys, descriptions, line drawings, and ecological characteristics
• DT Distribution maps for the native and established species
• DT A list of the synonyms currently in use for the accepted names