The autoecious species of Puccinia on Heliantheae ['Ambrosiaceae'] in North America

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Abstract
In this second part of a study of the species of Puccinia completing their life cycle on Heliantheae ['Ambrosiaceae'], six species are recognized. Two new species are described: Puccinia caborcensis Parmelee is a brachy-form and P. sonorae Parmelee is a eu-form. Both occur on Ambrosia (= Franseria) in Mexico. P. franseriae Syd., previously considered synonymous with P. splendens Vize, is morphologically separable. The life cycle of P. helianthellae Arth., from the first part of this study, is described as an unstable brachy-form. The usefulness of these rusts as an aid in the taxonomy of the hosts is indicated, and a rust species – host table is included. Each rust is illustrated by a photomicrograph from type material.

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