488 



T. Holm — Studies in the Cyperacece. 



Carex petricosa, Dew.* 



The original diagnosis! reads as follows : 



" Spicis subquaternis oblongis tristigmaticis, terrainali andro- 

 gynasuperne staminifera, inferioribus exserte pedunculatis ; 

 fructibus lanceolatis lsevibus aeutis ore apertis, squama ovato- 

 oblonga obtusiuscula brevioribus. 



Calm ten inches high, triquetrous, smooth, leafy towards 

 the base, upper leaves as long as the culm ; bracts leafy and 

 sheathing ; spikes four, exsertly pedunculate, oblong, subre- 

 mote ; fruit lanceolate, smooth, with an open mouth ; stigmas 



Fig. 21. Fruiting specimen of Carex petrieosa Dew. ; one-third of the 

 natural size. 



Fig. 22. The inflorescence of another specimen with five spikes ; one- 

 third of the natural size. 



Fig. 23. Pistillate squama of same ; magnified. 



Fig. 24. Perigynium of same ; magnified. 



three, and upper spike staminate above ; pistillate scale ovate, 

 oblong, rather obtuse and longer than the fruit, reddish brown 

 on the edge and whitish on the keel. Found on the summit 

 of the Rocky Mountains." 



The specimens were collected by Drummond between lat. 

 54°-56°, and according to MacounJ the locality must have 

 been between the sources of the Athabasca and Peace. River. 

 For many years the species was lost, and it is not until very 

 recently that this very rare and interesting species has been 



*= 0. invisa Bailey. fThis Journal (1) xxix ; p. 246, 1836. 



:(: Catalogue of Canadian plants, Montreal, p. 138, 1888. 



