78 
5. Parnassia Kotzebuei Cham. & Schlecht. Linnaea, 1: 549. 1826. 
Labrador, Bering Strait, Rocky Mountains. 
6. Parnassia parviflora DC. Prodr. 1: 320. 1824. 
Canada, Utah. 
7. Parnassia palustris L. Sp. Pl. 273. 1753. 
Labrador, Minnesota, Canada, Northwest Territory, Lake 
Superior. 
8. Parnassia Californica (A. Gray) Greene, Pittonia, 2: 102. 
1890. 
Parnassia palustris var. Californica A. Gray, Bot. Calif. 1: 202. 
1876. 
Revision of the North indian Thuidiums, 
By G. N. Best. 
The larger part of the material on which this revision js based 
was furnished by the collection of Zhuidiums in the herbarium of 
Columbia University, consisting of a large number of both Ameri- 
can and European specimens and exsiccatae. These have been es- 
pecially useful in that they made a comparison possible between 
native and foreign species by which diagnostic characters could be 
deduced with more certainty than could otherwise have been done. 
My thanks are due Mrs. Britton for verifying all the citations, 
arranging the synonymy and in securing the loan of type speci- 
mens ; also M. Eugene Autran, Prof. John Macoun and Dr. B. L. 
Robinson for the loan of type specimens. For valuable contribu- 
tions I am indebted to Dr. C. R. Barnes, Dr. Henri Philibert, Dr. 
T. C. Porter, Mr. E. A. Rau, Dr. J. K. Small and Rev. A. C. 
Waghorne. 
The Thuidiums are widely baciord over both continents. In 
North America they range from Greenland to Florida and from 
the Labrador to Vancouver's Island. Most common in the United 
States east of the Rocky Mountains, they are rare or absent on the 
Pacific slope. 
In studying a specific type of wide distribution it should be ue 
