Bruce L. Carr, David P. Gregory, Peter H. Raven, William Tai, Experimental Hybridization and Chromosomal Diversity within Gaura sect. Gaura (Onagraceae), Systematic Botany, Vol. 11, No. 1 (Jan. - Mar., 1986), pp. 98-111
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Carr et al. (1986) studied this question.
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