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Andropogon gerardii - Big Bluestem
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=ANGE
Classification, descriptions of several cultivars, photo, and United States range map.
Andropogon glomeratus
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=ANGL2
Bushy Bluestem.
Andropogon ternarius
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=ANTE2
USDA Plants Database entry for Splitbeard Bluestem.
Andropogon virginicus
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=ANVI2
Broomsedge Bluestem.
Andropogon virginicus
http://www.fs.fed.us/database/feis/plants/graminoid/andvir/
Species summary from the USDA Forest Service.
Andropogon virginicus
http://www.botany.hawaii.edu/faculty/cw_smith/and_vir.htm
Images and status as an invasive in Hawaii.