[floranorthamerica.org] Morphology & Ecology Discussion: Gayophytum racemosum, on the basis of mor­phological and ecological observation, appears to be an allotetraploid derived from hybridization between G. decipiens and G. humile or a related species that is presumably extinct. Gayophytum racemosum is most readily distinguished from G. humile by the dehiscence of the capsules and from G. decipiens by branching habit and by the capsules, which are not as conspicuously flat in G. decipiens. (link added by Mary Ann Machi)