J. Travis Columbus, Morphology and Leaf Blade Anatomy Suggest a Close Relationship Between Bouteloua aristidoides and B. (Chondrosium) eriopoda (Gramineae: Chloridoideae), Systematic Botany, Vol. 23, No. 4 (Oct. - Dec., 1998), pp. 467-478
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J. Travis Columbus (1998) studied this question.
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