42 The Ottawa Naturalist. [May 



Eriophorum Virginicum, L. 



Rather rare around Ottawa; known from the Mer Bleue, 

 Strachan Lake and East Templeton and formerly at the old 

 race course. Boggy place, The Glehe, Ottawa, Ont., No. 

 7,573; Strachan Lake near Cascade, Que., No. 61,190. 

 {John Macoun.) 



The species to be looked for about Ottawa are E. poly- 

 stachion, which is doubtless common in this vicinity though not 

 represented in cur herbarium, E. tenellum and E. opacum. The 

 general characters of these three species and their nearest relatives, 

 E. viridi-carinatum, E. Callitrix and E. graclle as indicated by 

 Mr. Fernald are given below. 



E. polystachion. Midrib cf the scale prominent only below 

 the membraneous tip ; leaves triangular-channelled above the 

 middle ; the upper sheaths dark girdled at the summit. 



E. viridi-carinatum. Midrib ot the scale prominent, extend- 

 ing to the tip ; leaves flat, except at the very tip; the sheaths 

 and bracts not dark-girdled. 



E. Callitrix. Upper sheaths distinctly inflated : culm 

 trigonous and (under lens) scabrous at tip ; pits of the re- 

 ceptacle with obtusely angled lower walls. 



E. opacum. Upper sheaths close or scarcely inflated : culm 

 terete, glabrous at tip ; pits of the receptacle with rounded 

 lower walls. 



E. gracile. Upper cauline leaf with the sheath longer than 

 the blade. 



E. tenellum. Upper cauline leaf with the sheath shorter than, 

 the blade. 



Scirpus Trichophorum, Aschers & Crsebn. (E. alpinum, L.) 

 has been found in several localities near Ottawa. 



Jas. M. Macoun. 





