82 PROCEEDINGS OP THE AMERICAN ACADEMY 



C. ^c«to Fries, Corp. 191. (Prolixce aniSalincE, Fries, Summa,, 71. Aquatiles, 

 Fries, 1. c. 7*2.) Species mostly larger than in the last group, mostly palu- 

 dose with green or light-colored large and long spikes ; stigmas two. — 

 Distinguished from the Rigidae mostly by habit. One of the species, C. sttb- 

 spathacea, is small and boreal. C. striata and C. aquatilis may be taken as 

 types of the group. Some of the species bear more or less conspicuous 

 auricles at the base of tlie bracts. 



66. Carex Hallii. 



C. elata and C. decidua, Olney, Proc. Am. Acad. 1872, 407. 

 Culm sharply angled and rough, strict (eighteen inches to two feet 

 hifh), longer than the narrow rough-margined leaves, the base purple- 

 sheathed and enclosed in reticulated fibres : bracts all serrate on the 

 margins, sheathless, the lower more or less leafy and often prolonged 

 as high as the culm, the upper setaceous : spikes sessile, about five, 

 the terminal staminate and usually more or less stalked, the others 

 closely sessile and short : scales of the staminate spike very broad 

 and obtuse, often emarginate, purplish-black : perigynium flat, almost 

 white, elliptic with contracted ends, prominently few-nerved, smooth, 

 the beak very short and entire but conspicuous, either much exceed- 

 ing or about the length of the very obtuse black scale. — Oregon, 

 Hall 594 and 598. In the latter specimen the white perigynia are 

 much longer than the hidden scales, and the scales are less obtuse than 

 in no. 594, which I take as the type. Distinguished at once from C. 

 senta, Boott, by the broad and obtuse scales and smooth perigynia. 



67. Carex senta, Boott, 111. 174. 



Culm nearly two feet high, very rough on the sharp angles: leaves 

 usually less than the culm, narrow, very rough on the margins : spikes 

 about three, the terminal staminate and more or less stalked with 

 lone-linear and acute white-nerved scales, the others pistillate, sessile, 

 an inch or so long, the lowest subtended by a short and very rough 

 bract : perigynium flat, ovate, pointed, several-nerved, serrate on the 

 mareins above, the orifice entire, broader and longer than the narrow 

 and acute or muticous scale. — California, Santa Inez Mts., 20 miles 

 northeast of Santa Barbara, Brewer 350, and Santa Susanna Mts., 

 Brewer 218. (The no. 218 was referred to C. Jamesii in Bot. Calif.) 



68. Carex invisa. 



C. podocarpa, W. Boott, Bot. Calif ii. 245, excl. descr. 



Culm fifteen inches to two feet high, sharply angled, erect, smooth : 



leaves nearly as long as the culm, two lines wide, roughish on the 



margins, short-pointed : spikes four or five, all sessile or the two 



lowest on short peduncles and erect, oblong and somewhat narrowed 



