Lawrence, George Hill Mathewson, 1910-  Lawrence, George Hill Mathewson, 1910- <br/><br/>
Taxonomy of vascular plants. 

 - [New York] :  Macmillan,  [1971] 
<br/><br/> First published in 1951. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany -- Classification.--Botany -- Classification.