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Excerpt from Phytologia, Vol. 88: An International Journal to Expedite Plant Systematic, Phytogeographical and Ecological Publication; June, 2006 The genus Helianthus consists of approximately 67 species of annual and perennial herbs made taxonomically difficult by hybridization among its members (correll and Johnston The genus has been divided into four sections (heiser Helianthus paradoxus and its parent species, H. Annuus and H. Petiolaris, are annuals belonging to the same section, are obligate out-crossers, and have the same chromosome number In spite of these similarities, phenological, morphological, and habitat characteristics are different making identification relatively easy. Helianthus annuus and H. Petiolaris ower in the spring and summer (depending on location), while H paradoxus owers in October. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.