1910] The Ottawa Naturalist. 127 



Specimens in flower were taken from the trees in June; and 

 others, from the same trees, were taken for the fruit, when it 

 matured. Notes were taken at the time of collecting, on such 

 points of importance which might be lost in the drying, as the 

 number of styles, the number of stamens, and the color of the 

 anthers; and numbered tags were fastened to the trees when 

 they were first visited to preclude the possibility of mistakes 

 when returning to them later. Flowering and fruiting specimens 

 were secured from about fifty trees, most of which showed some 

 variation, which was the reason for their being selected. 



Material of all the specimens was then submitted to Mr. 

 W. W.Eggleston, of the New York Botanical Garden, an 

 acknowledged authority on the genus and the contributor of the 

 revision of CratcBgus in Gray's New Manual, Seventh Edition. 

 Mr. Eggleston has distinguished in this material fourteen species 

 and varieties, and has regarded ten other specimens as hybrids. 

 In view of the incompleteness of the survey of the Ottawa 

 district, so far accomplished, and also owing to the fact that 

 further specimens have been collected this summer, which, 

 together with a considerable amount of material collected 

 earlier by Professor John Macoun, have still to be named, no 

 treatment of the subject of Ottawa Crataegi can yet be attempted. 

 A list is here given, however, which it is hoped may serve as a 

 basis for the work which still remains to be done. The following 

 species were collected by the writer in the localities indicated 

 after each name. 



Crat^gus. 

 rotundifolia Moench. E. of Dow's Swamp; Hog's Back; 

 Victoria Hospital; E. and W. of Beaver Meadow. 



rotundifolia Moench. var.- Faxoni (Sarg.) Eggleston. 

 Bank of Rideau River, W. of Billing's Bridge. 

 Jackii Sarg. Hog's Back locks. 



macrosperma Ashe. Glebe; Bank Street, Stewarton; 

 Montreal Road, beyond Eastview. 



ALNORUM Sarg. Woods in C. E. Farm Arboretum; Ottawa 

 South. 



Grayana Eggleston. S. of Dow's Swamp; Hog's Back; 

 bank of Rideau River, W. of Billing's Bridge. 



FLABELLATA (Bosc) Koch. Glebe; Harbord locks. 

 PEDiCELLATA Sarg.? W. of Dow's Swamp. 

 POLITA Sarg. E. of Dow's Swamp. 



suBMOLLis Sarg. W. of Dow's Lake; N., E. and S. of Dow's 

 Swamp; near Hog's Back; Ottawa South. 



Brainerdi Sarg. var. Egglestoni (Sarg.) Robinson. 

 Ottawa South; bank of Rideau River, near Hog's Back. 



Brainerdi Sarg. var. asperifolia (Sarg.) Eggleston. E. 



