68 THE PLANT LIFE OF MARYLAND 



spirit of George Vasey, then Botanist of the United States Depart- 

 ment of Agriculture. This publication lists 1154 species of Flower- 

 ing Plants and 37 of Ferns and Fern-allies. The continued activity 

 of botanists connected with the Agricultural Department at Wash- 

 ington led to the publication by Lester F. Ward in 1881 of his 

 "Guide to the Flora of Washington and Vicinity," which embraces 

 in its field all the country within a twenty-mile radius of the capitol, 

 thereby including considerable portions of Montgomery and Prince 

 George's counties, and small portions of three other counties of Mary- 

 land. This work lists 1211 species of Flowering Plants and 42 of 

 Ferns and Fern-allies, as well as a few Mosses and Liverworts. Six 

 lists of additions to Ward's Flora have been published from time to 

 time since 1881. In 1888 Basil Sollers published a "Check-list of 

 Plants Compiled for the Vicinity of Baltimore." The area com- 

 prised was a square the side of which was twenty-five miles in lengtii 

 and the centre the City Hall of Baltimore. Sollers' List was com- 

 piled to include the species listed by Aikin (there reduced to 1009 ) 

 and those in Ward's Flora and the first two lists of additions thereto, 

 together with additions made by himself. Dr. Boiling W. Barton and 

 George L. Smith. The total number of species thus listed is 1559 of 

 Flowering Plants and 50 of Ferns and Fern-allies. William M. 

 Canby, of Wilmington, Delaware, did considerable collecting in the 

 southern Eastern Shore, between 1865 and 1875, and to him we owe 

 the discovery there of Isoetes saccharata and Hydrocotyle canbyi. 

 Howard Shriver, of Cumberland, was for many years interested in a 

 study of the flora of the vicinity of Cumberland, work which has 

 been continued there since his death by Prof. George M. Perdew, 

 who has kindly placed their local collection in the hands of the author. 

 Other contributions to the knowledge of the flora of Maryland are 

 mentioned in the List of Literature at the close of this chapter. 



In the Plant List which forms Part VII of this volume 1378 spe- 

 cies of Flowering Plants and 59 species of Ferns and Fern-allies have 

 been collected or observed.* The number of species which will be 



*It is of interest to note in comparison that the number of species of 

 the same groups listed in Milispaugh's Flora of West Virginia is 1309; 

 in Porter's Flora of Pennsylvania, 2201; and in Mohr's Plant Life of Ala- 

 bama. 2476. 



