States and Canada that originated as hybrids between species in the subgenera Symphyotrichum and Virgulus. Subgenus Astropolium This subgenus includes about 10 species found across the Americas in salt marshes and salt flats. Subgenus Chapmaniana This subgenus includes a single species, S. chapmanii, found in Alabama and Florida. Subgenus Symphyotrichum This subgenus includes about 65 species occurring across North America, including a few species in Central America and the Caribbean, with one species also occurring in Eurasia. Subgenus Virgulus This subgenus includes about 28 species occurring across North America, including a few species in Central America and the Caribbean. Distribution As a whole, Symphyotrichum is native throughout the Americas, with one species, S. ciliatum, also native to eastern Eurasia. Several species have been introduced to Europe and other parts of the world. Most species are native to Mexico, the United States, and Canada, with several species occurring in the West Indies and Central America. Most members of subgenus Astropolium are restricted to South America. Species , Catalogue of Life listed 106 accepted species and identified naturally-occurring hybrids, including the following: Symphyotrichum ascendens (Lindl.) G.L.Nesom – western aster, longleaf aster, intermountain aster Symphyotrichum campestre (Nutt.) G.L.Nesom – western meadow aster Symphyotrichum chilense (Nees) G.L.Nesom – Pacific aster, common California aster Symphyotrichum cordifolium (L.) G.L.Nesom – heartleaf aster, common blue wood aster Symphyotrichum defoliatum (Parish) G.L.Nesom – San Bernardino aster Symphyotrichum depauperatum (Fernald) G.L.Nesom – serpentine aster Symphyotrichum dumosum (L.) G.L.Nesom – bushy aster, rice-button aster, Symphyotrichum eatonii (A.Gray) G.L.Nesom – Eaton's aster Symphyotrichum ericoides (L.) G.L.Nesom – white aster, heath aster Symphyotrichum falcatum (Lindl.) G.L.Nesom – white prairie aster, falcate aster, western heath aster Symphyotrichum frondosum (Nutt.) G.L.Nesom – short-rayed alkali aster Symphyotrichum georgianum (Alexander) G.L.Nesom – Georgia aster Symphyotrichum greatae (Parish) G.L.Nesom – Greata's aster Symphyotrichum hallii (A.Gray) G.L.Nesom – Hall's aster Symphyotrichum laeve (L.) Á.Löve & D.Löve – smooth aster, smooth leaved aster, glaucous aster Symphyotrichum lanceolatum (Willd.) G.L.Nesom – panicled aster, tall white aster Symphyotrichum lateriflorum (L.) Á.Löve & D.Löve – calico aster Symphyotrichum lentum (Greene) G.L.Nesom – Suisun Marsh aster Symphyotrichum novae-angliae (L.) G.L.Nesom – New England aster Symphyotrichum novi-belgii (L.) G.L.Nesom – New York aster Symphyotrichum oblongifolium (Nutt.) G.L.Nesom – aromatic aster Symphyotrichum oolentangiense (Riddell) G.L.Nesom – sky-blue aster, azure aster Symphyotrichum pilosum (Willd.) G.L.Nesom – hairy aster, frost aster Symphyotrichum prenanthoides (Muhl. ex Willd.) G.L.Nesom – crooked-stem aster Symphyotrichum puniceum (L.) Á.Löve & D.Löve –