135 



From the centers of earliest discovery in central and western 

 New York the species has spread eastward and southward, 

 chiefly in the moist woods of the limestone areas. Its absence 

 from adjacent and intervening areas of acid soils seems to in- 

 dicate its decided preference for calcareous soils. In 1930 it was 

 observed in Montgomery county, in 1931 in Schoharie county, 

 in 1932 in Albany county and in 1933 in Columbia county in 

 the Hudson valley. These observations seem to indicate that 

 the species may already have reached the calcareous areas of 

 western New England and may be expected to appear farther 

 south in the Hudson valley and northward into Vermont as well 

 as in the calcareous areas down the St. Lawrence river region. 



It seems desirable to place some of these facts on record, 

 and the accompanying map is based upon collections in the 

 New York State Museum, the Gray Herbarium, New York 

 Botanical Garden herbarium, and the herbarium of the United 

 States National Museum. It is not the purpose of this note to 

 cite the numerous collections which have been made, but merely 

 to indicate on the accompanying map the year of collection for 

 most of the localities known. This shows perhaps better than 

 any other method the progressive spread of the species from 

 1879 to 1933, a period of over fifty years since the initial dis- 

 covery of the species near Syracuse. Reference to the map also 

 shows that the known localities seem to form five or six rather 

 definite groups. It is possible that the species occurs more evenly 

 distributed than this grouping seems to indicate. On the other 

 hand it may represent the spread of the species from separate 

 centers of introduction occurring at different dates. 



New York State Museum, Albany, N.Y. 



