PREFACE 



This catalog of the vascular plants of Ohio is based on specimens 

 for the most part in the State Herbarium of the Ohio State University, 

 although some records have also been obtained from other collections. 

 The State Herbarium is at present a collection of about 30,000 sheets, 

 and represents the labors of many Ohio botanists. The distribution by 

 counties is in many cases not the known distribution, but it was thought 

 advisable to give only such data as could be verified by specimens. A 

 list* of 254 species and varieties was published with a view to their ex- 

 clusion from the state catalog if no evidence of their presence in the 

 state were forthcoming. As a result of this publication, numerous 

 records and specimens were obtained. The present catalog contains 

 2065 numbered species, about one-fourth of which are non-indigenous. 

 Three additional species have been inserted in their proper places since 

 the list was numbered for publication. A considerable number of varie- 

 ties and supposed hybrids are also included. 



"The Fourth State Catalogue of Ohio Plants," by W. A. Keller- 

 man, 1899, was based on specimens in the State Herbarium at that time. 

 However, a large number of species was included for which there was 

 no direct evidence. Most of these, together with some species wrongly 

 identified, have been omitted. A large list of contributors of specimens 

 from various parts of the state was published in the "Fourth Cata- 

 logue." Many of these have greatly increased their collections in the 

 State Herbarium and a number of other botanists have sent important 

 specimens. 



The species in the State Herbarium have been carefully deter- 

 mined, in the more difficult groups by the best experts in the country, 

 and it is believed that there are few mistakes in the list as now pub- 

 lished. An}'- errors, however, can be definitely corrected in the future. 

 Several species became uncertain through the shifting of names and 

 have been omitted until more and better material can be studied. 



The species are numbered serially, and the varieties, forms, and 

 supposed hybrids are indicated by letters. Additions of species will 



♦Plants on the Ohio State list not represented in the State Herbarium Ohio Nat 

 9: 413-415. 



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