11 



Nitella (not Tolypella) Nlacounii. 



)ing Tolypella Macounii, the dc 



1 



"had been delayed in the hope of obtaining more specimens/' I 

 have received from Prof. JMacoun small specimens of the same plant 

 from Lake St. Clair. An examination of these plants convinces 

 me that the anthcridia are terminal and not lateral ; they, there- 

 fore, belong to Nitella, This species takes its place close to N. 

 Stiiartii^ A. Br., from New Zealand, as follows: 



Heterophylte, repetito furcatci:, monoic^e, macrodactyte. 



Segmenta ultima sa^pe bicellularia, cell. ult. non mucroniform. 



£> 



N, 



Segmenta 



A. Br. 



TO ^\ N. Stiia 



T. F. Allen. 



New Western Grasses. 



By Dr. Geo. Vasey 



POA MACRAXTHA. — Culms ascending from a thickish, creep- 

 ing rhizoma, stout, smooth, lO to 15 inches high, leafy, the lower 

 leaves crowded, and with long, loose sheaths which are longer 

 than the internodes, the blades rather rigid, involute and cnrving 

 or recurved, 4 to 6 inches long, smooth ; panicle 2 to 4 inches 

 long, erect, close, lax and sometimes interrupted below, the 

 branches short (5^ to i ^ inches), in twos or threes, erect, flower- 

 ing mostly to the base; spikelets large, 5 to 6 lines long, 3 to 4 

 lines wide, much compressed, about seven-flowered ; empty 

 glumes 4 lines long, equaling the adjacent flowers, the upper a 

 little the longer, three-nerved, acute ; flowering glumes 4 lines 

 long, acutish, broad, five- nerved, the keel and lateral nerves 

 coarsely ciliate below ; palet about as long as its glume, sparsely 

 ciliate on the keels; stamens 3 ; styles 2; lodicules 2, conspicu- 



ous, lobed, ^ to ^ line long. 



Apparently dioecious, collected on sandy shores at the mouth 

 of the Columbia River, Oregon, by Mr. Thos. Howell, also on the 

 beach at Tilamook Bay in 1872 when it was distributed as P. 

 Douglasii, which it resembles in habit, but has larger flowers, 

 longer and less compact heads. 



POA ARGEXTEA, Howell. — Culms loosely tufted, slender, 6 to 

 8 inches high, erect or somewhat decumbent at the base; leaves 



