642 



Eggleston : New North American Crataegi 



Aug. 



■ 



R, S. Wiliiams, Columbia Falls, Montana, May 19, 1897. 



D. T. MacDoiigal 4.^^, Flathead Plains, northwestern Mon- 

 tana, June 29, 1901, alt 1000 m. 



L. M. Umbach 2^j, ravines, Poison, Montana, Aug. 19, 1901. 



-Z>. 7! Buthr ^00, £oiy joj, 504, and ^oj. Big Fork, north- 

 eastern border of Flathead Lake, Montana, Aug. 23, 1908. 



B. T. Butler ^12^ Yellow Bay, Flathead Lake, Montana, 

 Aug. 8, 1908. 



B. T. Buthr 5^5 and ^26^ Ravalh", Montana, Aug. 26, 1908. 



B. T. Butler ^2i-j2j^ southwest border of Flathead Lake, 

 19, 1908, represents a form with leaves two cm. wider than 

 the type. 



This species occurs with C. Douglasii Lindl. and in leaf might 

 easily be mistaken for it, having the appressed pubescence of the 

 upper surface and the nearly glabrous lower surface, like C, Doug- 

 lasii; but C. Willianisii has red fruit with unpitted nutlets, while 

 C. Douglasii is black fruited with pitted nutlets. It is much nearer 

 C. Columbiana Howell but has larger, less pubescent leaves, with 

 their apexes and lobes less acuminate, while the fruit is larger and 

 matures at least two weeks later than C. columbiana fruit. 



This species seems to'be local in the Flathead River basin, and 

 the nearest station from which I have seen C. columbiana is at 

 Dixon, Montana, near the mouth of the Flathead River. 



New York Botanical Garden. 



