194 METCALF: NOTES ON NORTH DAKOTA PLANTS 



dentalis; these two intergrade so completely that it is very doubtful 

 if 5. occidentalis should exist as a separate species; it is unfortunate that 

 the majority of the specimens can be referred to the type S. occidentalis 

 but S. validus having priority must stand. Under favorable conditions 

 when validus was found in spring}^ places, the soft, light green, thickened 

 culm was apparent and distinguishable from the much harder olive- 

 green culm of 5. occidentalis, but here usually this character was too 

 variable to be used for identifying the two species. Again, the broader 

 achene and longer spikelet of 5. occidentalis are considered valuable 

 characters in distinguishing this species from 5. validns. Numerous 

 measurements and comparisons were made in the field with the result 

 that all normal or extreme variations of both factors were found in a 

 single patch that was all of the hard olive-green culm type. The 

 character of the rays, whether fiexuous or stiff, was subject to the same 

 variation. In the east such extensive variation has not been observed. 

 However, in North Dakota, until definite work has been done in growing 

 these two species under different conditions of alkalinity it is still a 

 question whether S. occidentalis is a valid species. Present evide^ice 

 points in the opposite direction. 



Scirpiis nevadensis Watson. Not previously recorded from the state. 

 Rather common throughout, having been reported from 35 lakes in 

 10 counties. This plant has not been observed previously east of 

 Wyoming so that its known range is greatly extended eastward. 

 Specimens collected from Salt Lake, Dawson, Kidder Co. (No. 215, 

 Aug. 6, 1917); Bird Lake, Dawson, Kidder Co. (No. 263, Aug. 10, 1917); 

 Smoky Lake, McHenr}^ Co. (No. 426, Aug. 29, 1917, D. C. Mabbott). 



Carex cristata Schwein. {Carex cristatella Britton.) Elsie Lake, 

 Richland Co. (No. 72, July 23, 191 7) and Dion Lake, Rolette Co. 

 (No. 472, Sept. 8, 1917, D. C. Mabbott). Bergman reports this from 

 Wahpeton and Walhalla. 



Carex diandra Schrank var. ramosa (Boott) Femald. Buckhouse 

 (No. 93, July 23, 1917) and Stack (No. 169, July 26, 1917), Sloughs, 

 Richland Co.; Swamp Lake, Logan Co. (No. 195, Aug. 2, 1917); Fal- 

 kirk Lake, McLean Co. (No. 445, Sept. 3, 1917); Salt Lakes, North of 

 Ryder, Ward Co. (No. 481, Sept. 11, 191 7). Bergman reports this 

 from Pleasant Lake and Fort Totten. 



Carex riparia W. Curtis. Not previously reported from the state, 

 which, however, comes within the range commonly given. Frequent 

 along the border of lakes and sloughs; Arrowwood Lake, Stutsman Co. 

 (No. 331, August 15, 1917, D. C. Mabbott); Girard Lake, Pierce Co. 

 (No. 436, Aug. 31, 1917, D. C. Mabbott) ; Hester Lake, McHenry Co. 

 (No. 445, Sept. 4, 1917, D. C. Mabbott); Rock Lake, Towner Co. 

 (No. 493, Sept. 13, 1917, D. C. Mabbott). Also observed in Cavalier, 

 Griggs, Foster and Ramsey Counties. 



Carex rostrata var. utricularia (Boott) Bailey {Carex ultriculoria 

 Boott). Frequent throughout the state; Elise Lake, Richland Co. 

 (No. 81, July 23, 1917); South Napoleon Lake, Logan Co. (No. 185, 

 Aug. I, 1917); Isabel Slough, Dawson, Kidder Co. (No. 232, Aug. 8, 



