CAREX AQUATILIS, WAHLB. 237 



is great, even among examples growing near each other. 

 Among specimens from the bank of the Spey at Aviemore 

 (Co. 96), Messrs. Wilson and Wheldon, some answer very 

 well to the var. virescens, Ands., with glumes subrotund 

 and shorter than the fruit, while others have the glumes 

 longer and almost cuspidate. The Welsh and Irish 

 specimens do not vary so much ; and Mr. Scully's Kerry 

 specimens are very like in habit, etc., to the White Water 

 specimens. 



Wahlenberg in " Fl. Lapponica " (1812), 247, gives, 

 " squamis plerumque longitudine capsulis aequantibus sed 

 multum angustioribus." Those specimens named rigida 

 differ from the other forms of the species in the shorter, 

 thicker, and denser-fruited sessile female spikes, with rigid, 

 thick, sessile, and more definitely arranged male spikes, 

 broader leaves more strongly nerved. 



Ny lander in " Sp. PI. Fenn." pt. 2 (1844), 2 3, has a var. 

 planifolia, " culmo acutangulo, foliis siccitate planis " ; and 

 this rigida has the stems much more angular, and leaves 

 flatter than the usual forms ; but he could not have over- 

 looked the remarkable difference in spikes, which also 

 suggest in habit C. acutifonnis, Ehrh. (paludosa). 



The Boswell Herbarium contains some puzzling speci- 

 mens from Lochnagar, which are mentioned by Syme in 

 " Eng. Bot." x. 112, and which are probably C. rigida 

 X aquatilis. 



Babington in his "Manual," ist ed., p. 340, mentions 

 specimens given him by Dr. Greville from " Tableland above 

 Canness, Glen Isla," which seem to be another form of this 

 hybrid. Babington suggests C. dacica, Heuffl. ; but that is 

 put by Richter, and also by Nyman (though with a query) 

 under C. cczspitosa, L. Certainly the figure of dacica by 

 Wierzbicki * is much more like rigida than caspitosa, as it 

 shows a creeping rhizome. 



Kiikenthall has named specimens gathered by Mr. 

 Marshall at "2000 ft. below Corrie of Clova, 1904," as 

 C. aquatilis x rigida ; the gatherer remarks, " growing with 

 the parents." 



1 "Linnrea," xxxi. 1863. 



