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| Poa | |
|---|---|
| Name | Poa |
| Regnum | Plantae |
| Unranked divisio | Angiosperms |
| Unranked classis | Monocots |
| Unranked ordo | Commelinids |
| Ordo | Poales |
| Familia | Poaceae |
| Genus | Poa |
Poa is a genus of grasses in the family Poaceae notable for its ecological prominence in temperate grasslands, alpine meadows, and urban lawns. Several species within the genus are among the most widespread and economically important turf and forage grasses, and they have been subjects of botanical, ecological, and agricultural study across institutions such as Royal Botanic Gardens, Kew, Smithsonian Institution, and United States Department of Agriculture. The group has been referenced in floras and monographs produced by authorities like Carl Linnaeus and modern taxonomists associated with the International Code of Nomenclature for algae, fungi, and plants.
Members of this genus are typically perennial or annual grasses characterized by open, branching panicles, boat-shaped leaf tips, and membranous ligules. Vegetative morphology has been described in classical treatments originating with Linnaeus and refined by modern authors publishing in journals such as Taxon and Systematic Botany. Spikelets usually contain three to six florets and display glumes and lemmas that have diagnostic awn and keel characters, referenced in floristic keys used by the Royal Botanic Gardens, Kew and the Missouri Botanical Garden. Anatomical features used for identification are preserved in herbaria including the Herbarium of Harvard University, Kew Herbarium, and regional collections maintained by institutions such as the Botanical Research Institute of Texas.
The genus was circumscribed by Carl Linnaeus and has been revised by taxonomists at institutions like Royal Botanic Gardens, Kew, the USDA PLANTS database, and university herbaria such as University of California, Berkeley. Molecular phylogenetic work published in journals like Molecular Phylogenetics and Evolution and American Journal of Botany has redefined species boundaries and relationships among related genera in Poaceae, involving researchers affiliated with University of Oxford, University of Cambridge, and Max Planck Society. Well-known species historically recognized by agronomy and horticulture include those used in turfgrass science studied by programs at Penn State University and Texas A&M University. Taxonomic debates have involved names conserved under the International Botanical Congress and revisions appearing in monographs from the New York Botanical Garden.
Species occur across temperate to subarctic regions of the Northern and Southern Hemispheres, inhabiting environments surveyed by botanists at organizations like Royal Botanic Gardens, Kew and regional floras including the Flora of North America and the Flora Europaea. Habitats range from coastal dunes recorded by researchers at Scripps Institution of Oceanography to alpine meadows studied in the Alps and Rocky Mountains. Several species are common in urban and agricultural settings monitored by agencies such as the United States Department of Agriculture and the European Environment Agency. Introductions and range shifts documented by ecologists at CSIRO and conservation assessments by the IUCN reflect both natural dispersal and anthropogenic translocation.
The genus plays foundational roles in grassland ecosystems studied by ecologists affiliated with University of California, Davis, University of Minnesota, and the Smithsonian Institution Tropical Research Institute. Species provide forage for ungulates observed in studies by researchers at Montana State University and University of British Columbia, and they host insect herbivores documented in entomological surveys from institutions like the Natural History Museum, London and the American Museum of Natural History. Mycorrhizal associations and soil interactions have been investigated by groups at Wageningen University and University of Göttingen. Pathogen interactions, including rusts and smuts, have been subjects of research by plant pathologists at Rothamsted Research and the John Innes Centre.
Numerous species are cultivated for turf, pasture, erosion control, and ornamental landscaping, with horticultural practice taught in programs at Royal Botanic Gardens, Kew, Cornell University, and University of Florida. Turfgrass breeding and management literature from Pennsylvania State University, University of Georgia, and industry organizations like the Turfgrass Producers International document cultivar development, seed production, and pest control. Agricultural extension services run by institutions such as the United States Department of Agriculture and the Food and Agriculture Organization provide guidance on establishment, fertilization, and rotational grazing involving these grasses. Historical usage in managed landscapes can be traced through landscape architecture archives associated with Olmsted Brothers and municipal park systems like Central Park Conservancy.
Conservation assessments for particular species have been conducted by organizations including the IUCN, national red lists such as those maintained by the United Kingdom Biodiversity Action Plan, and regional conservation agencies like the New Zealand Department of Conservation. Threats identified in conservation literature from groups such as Conservation International and the World Wildlife Fund include habitat conversion, invasive competitors documented by researchers at CSIRO and genetic erosion noted by seed banks like the Svalbard Global Seed Vault. Ex situ and in situ conservation measures are implemented by botanical gardens including the Royal Botanic Gardens, Kew and seed conservation programs at the Millennium Seed Bank Project.
Category:Poaceae genera