SCIENTIFIC PAPERS. 
' A REVISION OF THE AMERICAN SPECIES OF RUMEX 
OCCURRING NORTH OF MEXICO. 
BY WILLIAM TRELEASE. 
The following revision is based on a study of the mater- 
ial contained in the Engelmann, Bernhardi, and general 
herbaria of the Botanical Garden, and in the herbaria of 
Harvard University, the United States Department of 
Agriculture, Columbia College ( including the Meisner 
herbarium), and the California Academy of Sciences, and 
the private collections of Capt. J. Donnell Smith, Dr. 
Chas. Mohr, Mr. W. M. Canby, Mr. I. C. Martindale, Prof. 
Jos. F. James, Mr. A. S. Hitchcock and Mr. H. J. Web- 
ber. Critical species, and material for the Garden herba- 
rium, have also been contributed by many correspondents. 
My cordial thanks are hereby tendered all who have thus 
aided me; and I have particularly to thank Professor 
Areschoug of the Lund University, for the donation of a 
critical set of Scandinavian docks, especially rich in hybrids. 
Rumex is a genus which has been held to include from 
100 to about 130 species, the greater part of which belong 
to the north temperate region of both continents, though 
a considerable number occur south of the equator, and a 
few reach up into the Arctic regions. The principal mono- 
graphs of the genus are by Campdera,* and Meisner. f 
For the general synonymy of our species, I have contented 
myself with references to the latter. Of the twenty-one 
* Monographie des Rumex, Paris, 1819,— a paper which I have not 
seen. 
t In De Candolle’s Prodromuas, xiv., Paris, 1856, 41. For other refer- 
ences see Bentham and Hooker, Gen. Plant. iii. 100. 
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