498 Canadian Piecord of Science. 



differences in the collection of Crataegus from the neighbour- 

 hood of Montreal, furnished by Mr. Jack, as satisfy him that 

 the number of species, hitherto recognised, in this part of the 

 continent, is much too limited. Several of these were 

 probably entirely new to him, while as to others, the result 

 of longer experience and the use of wider opportunities of 

 observation have given greater clearness of vision and more 

 confidence in his own convictions, enabling him to announce 

 his new determinations without hesitation. Nothing else can 

 take the place of comparison of a large number of specimens, 

 in the differentiation of species. Whether all the conclusions 

 of Prof. Sargent, put forth in this brochure, be accepted or 

 not, he has earned the gratitude of the botanists of this 

 district. Any one who has made a collection of the haw- 

 thorns of the Island of Montreal and its neighbourhood, as 

 the writer has done, has felt how inadequate was the list of 

 Crataegus given in Macoun's Catalogue, and the description of 

 species in Gray's Manual, or in the more recent publication 

 of Britton and Brown, to embrace all the well marked differ- 

 ences of the specimens he obtained. All collectors will 

 welcome this enlarged list. The first person to call attention 

 to the large variety of Crataegus growing on the adjacent 

 banks of the St. Lawrence, was Dr. T. J. W. Burgess, Medical 

 Superintendent to the Hospital for the Insane at Verdun. 

 Many years ago, he declared that there were not fewer than 

 twelve well defined species to be found within a mile or two 

 of Verdun ; and the one regret his friends now feel is that 

 he did not proceed at once to describe them, as they urged 

 him to do. He pleaded lack of time then, and now he is anti- 

 cipated in this work by Prof. Sargent. But although we 

 should have naturally enough been glad if a local naturalist 

 had been the first to communicate to the world substantially 

 what is now published by the Director of the Arnold 

 Arboretum, science fortunately knows no national boundaries, 

 and is not bound up with the claims to distinction of those 

 who labour in its domain. 



Accepting Prof. Sargent's catalogue of the Crataegus family 

 of this province, we find him crediting it with twenty distinct 

 species of native hawthorns, where Macoun allowed only 

 five species and three varieties. They are collected into 

 eight groups — Crus-galli, Punctat.e, Molles, Flabellet.e, 



TENUIFOLL^, DiLITATiE, TOMENTOS^, and COCCINE.E. Six of 



the species are minutely described in this pamphlet, — 

 Crataegus suborhiculata, G. Canadensis, C. anomala, C. densiflora, 



