﻿406 Mackenzie: Notes on Carex 



aqutttilis Wahl, by discriminating collectors, who have noticed 

 that it was distinct from Carex stricta, and who could find no other 

 name apparently available for it. 



By far the most widely distributed species of this group in the 

 eastern part of the United States, is a plant to which I am applying 

 the name Carex Emoryi Dewey. This is a freely stoloniferous plant 

 growing in beds like Carex striciior. It, however, is a much stouter 

 plant, and the basal sheaths are not filamentose or hispidulous. 

 The perigynia, which are abruptly and prominently short-beaked, 

 are smooth under an ordinary lens except towards the apex 

 and much resemble the perigynia of the C. aquatilis group. 

 This species ranges from New York, western New Jersey and 

 Maryland to Manitoba, Colorado and New Mexico, and has at 

 various times been referred to Carex stricta or Carex aquatilis. 



A slender species of this group with a northerly range is Carex 

 Haydeni Dewey. This plant has broadly oval or suborbicular 

 perigynia which are noticeably inflated and light brownish at 

 maturity, in these characters being readily separable from other 

 members of the group here discussed. The scales always exceed 

 the perigynia and the spikes are small in size. While the culms 

 are cespitose they are much less densely so than in Carex stricta. 

 As far as I can make out the habit of growth is much like that of 

 Carex torta, i. e., the plant has very short ascending stolons. The 

 basal sheaths are often, but not always, entirely free from the 

 filamentose fibers so evident in Carex stricta, and the culms are 

 usually much darkened at the base. 



The first three species referred to above all vary to a very 

 considerable extent in the size of the pistillate spikes. Specimens 

 with very short spikes, referable to Carex strictior, have been 

 described as Carex stricta var. curtissima Peck. Such specimens 

 have the perigynia very crowded, and on this account the peri- 

 gynia not having a chance to properly develop often present a 

 different appearance from specimens where they are less crowded. 

 I regard these plants only as exhibiting individual peculiarities, 

 and do not believe they should be given varietal recognition. 



These same three species also often produce slender elongated 

 pistillate spikes. Such specimens have of late years been going 

 under the name Carex stticta var. angustata (Boott) Bailey, and 



