page_title: List of Poaceae genera
section_title: Genera
hierarchical_section_title: List of Poaceae genera / Genera
caption_attribution_description: English: Arundinaria gigantea
context_page_description: The true grasses are one of the largest plant families, with around 12,000 species and roughly 800 genera. They contain, among others, the cereal crop species and other plants of economic importance, such as the bamboos, and several important weeds.
  Grasses probably originated in the understory of tropical rainforests in the Late Cretaceous, but have since come to occupy a wide range of different habitats. Notably, they are the dominant species in grasslands, open habitats that cover around one fifth of the earth's terrestrial surface. The C₄ photosynthetic pathway has evolved at least 22 times independently in the grasses; C₄ species are more competitive than C₃ plants in open habitats with high light intensity and warm temperatures.
  The deeper relationships in the family have been resolved by recent molecular phylogenetic work. This has been translated into a modern classification which divides the grasses into twelve subfamilies and a number of tribes, with large tribes further divided into subtribes.
  Anomochlooideae, Pharoideae and Puelioideae are early diverging lineages containing only a few species.
caption: Arundinaria gigantea, a temperate woody bamboo (Bambusoideae: Arundinarieae)
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