1917] The Ottawa Naturalist. 137 



teacher. Two days later, September 16, 1908, specimens of the 

 plant were obtained in the Brewery Creek, Hull, almost opposite 

 the pork factory. They were about two to four inches high but 

 so covered with slime and dirt that it was almost impossible to 

 make decent herbarium specimens from them. This was a year 

 of exceptional low water in the Ottawa river, which afforded 

 good opportunities for obtaining the littoral and aquat,ic plants. 

 On September 19, while collecting along the shore near the 

 Country Club, it was found that the rapids were so low that one 

 could pass dry-footed, by stepping stones, to the islands. The 

 whole channel bottom of boulders was covered with a luxuriant 

 growth of river weed vastly different from that in Brewery Creek. 

 Here the plants were clean and vigorous, averaging perhaps a 

 foot in height and with terminal clusters of larger seed capsules. 

 At this time a new concrete dam was being constructed above the 

 Chaudiere Falls and the water was entirely diverted, leaving the 

 river bottom exposed right to the brink of the ledge over which 

 the torrent plunges. An opportunity was taken, November 22, to 

 inspect the curiously split and water-worn ledges of limestone 

 which the rushing floods of spring and the heavy ice formations 

 of winter are always changing and wearing away. The whole 

 river bottom, right to the brink of the chasm, was carpeted with 

 river weed, but the plants were so dwarfed by the swift current 

 as to be only from one to three inches in height 



Potentilla arguta Pursh. Tall Cinquefoil. 



The only locality known to me for this, the largest and 

 coarsest of our cinquefoils, is on the top of King's Mountain, 

 where it was collected in fruit Aut^ust 1, 1909, and in flower 

 June 19, 1910. 



Potentilla recta L. Rough-fruited Cinquefoil. 



One specimen taken at Meech Lake, September 26, 1908. 

 apparently an accidental seedling from some garden. A second 

 example was found on the sloping canal bank of the Driveway, 

 near the resident of the Papal Ablegate, May 29, 1909, which 

 also was an evident straggler. 



Potentilla tridenta Ait. Three-toothed Cinquefoil. 



While examining the rocky western summits of King's Mt, 

 on August 1, 1909, it was with much surprise and genuine 

 delight that this lowly plant, as yet unrecorded from the district, 

 was found established in crevices of the rocks. Though not 

 abundant the plants immediately recalled my native shores of 

 Cape Breton, where many dry barren slopes are profusely 

 clothed by the stiff, dark-green foliage and starred by the 

 innumerable small white flowers. When discovered the plants 



