Table 1. Summary of switchgrass biotypes in common garden competition experiments at sites in Columbus, OH, and Ames, IA (2011–2012), including the ID for each biotype.

Biotype	ID	Status	Ecotype	Origin	Cultivation history
‘Kanlow’	KL	Cultivar	Lowland	Hughes County, OK	Developed by Kansas Agricultural Experiment Station. First collected in 1957 from one site; 200 of the resulting plants were selected and allowed to cross-pollinate.
‘Kanlow Nebraska 1’	KN1	Cultivar -unreleased	Lowland	Hughes County, OK	A synthetic population based on ‘Kanlow’ genotypes selected for winter survival near Mead, NE.
‘Blackwell’	BW	Cultivar	Upland	Kay County, OK	Developed by Kansas AES. Seed was harvested in 1934 from a single plant located in a native prairie site near Blackwell, OK. The cultivar population is derived from random seed increases.
‘Sunburst’	SB	Cultivar	Upland	Union County, SD	Developed by South Dakota Agricultural Experiment Station. Plants collected from multiple native prairies in southeastern SD and open-pollinated; selections from resulting plants were used to derive a population of 800 plants (8 families).
Ohio wild population 1	OH1	Wild	-	Marion County, OH	Seeds collected in 2010 from a remnant prairie in Daughmer Bur Oak Savannah, north-central Ohio.
Ohio wild population 2	OH2	Wild	-	Erie County, OH	Seeds collected in 2010 from a remnant prairie at NASA’s Plum Brook Research Station in northern Ohio.
Iowa wild population 1	IA1	Wild	-	Story County, IA	Seeds collected in 2010 from a remnant prairie at Doolittle Prairie State Preserve.
Iowa wild population 2	IA2	Wild	-	Story County, IA	Seeds collected in 2010 from a remnant prairie near the Heart of Iowa Nature Trail in Slater, IA.

Information for released cultivars is from USDA NRCS release brochures; information on the history of the experimental cultivar KN1 is from [47].