Material and methods •••••••••• __ •____•••••• 2 Summary•••.••_••___________________._____ 2.'; NomenclatJ)re of Berberis fmd related genen\. 2 Literature cited ___._••••__ •__ ••••_•••••_.•_.26 Barberries susceptible to Pucdnia gramin~__ 13 ]\>[embers of Berberldaeeae apparently Im mIme from stem rust_ ••• ____ •_____._•••_.. 18 IN'l'RODUCTlON Nmv that it has been shown conclusively that new parasitic races and physiologic fonns of stem rust, Puccinia graminis Pers.may originate through hybridization on barberries, where the sexu.;Jstage of the stem-rust fungus develops, the question of exactly what inter :mediate hosts can and do harbor this destructive parasite assumes more than usual significance.Infonna.tionregarding the suscepti bility of Berberidaceae to stem rust is rather :meager in the literature ~of uredinology.Consequently, many exsiccati specimens in various en herbaria jn the United States and abroad were examined for ;,rust ;; infection; and numerous sp'eci.es,v!1rieties, and.hybri~ ?fBeJ;!~eris .and related genera were artifimally moculated wIth spondia of:differ C"l ent races of P. graminis.In addition, tield observations on the z: susceptibility of barberries under natural conditions have been lli~
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Levine et al. (1932) studied this question.