title: The distribution of C4species of the Cyperaceae in North America in relation to climate.
abstract: The percent of species of the Cyperaceae possessing the C4pathway was calculated for twenty-five regions of North America. A stepwise multiple regression analysis was used to determine which climatic variables were most highly correlated with the percent C4species among the various regions. The square of the mean July minimum daily temperature exhibited the strongest correlation with the transformed percentage of C4species. It appears that the relationship to climatic variables of the C4species of the Cyperaceae is similar, but not identical to the relationship previously reported for C4species of the Gramineae.
authors.affiliation: Barnes Laboratory, The University of Chicago, 5630 S. Ingleside Avenue, 60637, Chicago, IL, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Teeri
authors.affiliation: Barnes Laboratory, The University of Chicago, 5630 S. Ingleside Avenue, 60637, Chicago, IL, USA.
authors.forename: D A
authors.initials: DA
authors.lastname: Livingstone