266 T. Holm — Studies in the Cyperacece. 



Art. XXYII. — Studies in the Cyperacece ; by Theo. Holm. 

 X1Y. On a collection of Carices from Alaska with remarks 

 npon the affinities of Carex circinata C. A. Mey. and C. 

 lejocarpa C. A. Mey. (With figures in the text.) 



Among- the very extensive botanical collections, which Dr. 

 Walter II. Evans brought from Alaska during the summers of 

 1897 and 1898, were several Carices, which were kindly 

 donated to the writer, and upon which we have prepared the 

 following paper. The Alaskan coast with adjacent islands has 

 for many years been known to possess an unusually rich vege- 

 tation of Cyperacece, especially Carices, and a considerable 

 number of highly interesting species are recorded in the works 

 of Boott, Hooker, Ledebour, Macoun and Meyer.* Several of 

 these species are absolutely local and their geographical range 

 is thus confined to some of the small islands or to a few locali- 

 ties on the main land ; some others are found, also, on the 

 Asiatic side of Bering Sea ; a few are distributed throughout 

 the northern part of Asia, Europe and this country, while 

 some of these species are even arctic and circumpolar. The 

 following species were collected by Dr. Evans : 



Carex macrocephala Willd. 



Many gigantic specimens with spikes 7 cm in length and over 

 4 cm in thickness ; the species is considered as dioacious by 

 Franchet, who examined a large number of specimens from 

 eastern Asia, but among those collected by Dr. Evans -there 

 were several individuals with purely staminate and pistillate 

 spikes on the same plant. 



var. oracteata Holm nov. var. 



The bracts of the inflorescence developed into green leaves, 

 about 10 cm in length. 



Common in sand along shore, Kussiloff. 



C. Macloviana d'Urv. var. Haydeniana (Olney). 

 On flat at Feeny's ranch, five miles from Kadiak. 



C. canescens L. 



Common about Sitka. 

 var. polystachya Bail. 



In low places, TTnalaska. 



* For references consult the bibliography appended to this article. 



