442 Mackenzie: Notes on Carex 



Perigynia ovate-orbicular ; leaves 1-2 mm. wide. C. Leavennwrthii. 



Scales about the length of the perigynia. 



Perigynia 3.5 mm. or less long ; culms twice the length of the leaves. 



C. mediterranean 



Perigynia exceeding 3.5 mm. in length; culms little exceeding the upper 



leaves. 



C. gravida. 



• 



Heads long, usually interrupted, 15-35 mm - l° n g- C- Mithlenbergh. 



* 



The type-specimen was collected by E. S. Steele at Washing- 

 ton, D. C, May 23, 1898, distributed as Carex gravidq, and is in 

 my private herbarium. Other specimens referable to this species 



are : 



Tennessee: Knoxville, Ruth 20925, July, 1897, and 107, 

 June, 1898. 



Missouri : Jackson County, Mackenzie, June 4, 1899 and 

 June 10, 1900, and June 13, 1900; St. Louis, Glatfclter, 1894 and 

 1895. 



Kansas: Cherokee County, Hitchcock loip, May 7, 1897. 



v Carex agglomerata sp. nov. 



A strongly tufted plant, the culms 6 dm. or less high, usually 

 considerably exceeding the leaves, triangular, smooth below, 

 slightly rough on the angles immediately below the head. Leaves 

 regularly and evenly distributed on the lower part of the culm 

 and not chiefly tufted near the base, flat, 3-4 mm. wide, 10-20 

 cm. long, smooth towards the base, roughened towards the apex and 

 on the margins ; spikes densely aggregated in a solitary terminal 

 head, 10 mm. wide, 25-35 mm - l° n g> the lower usually slightly 

 separated, the spikes bearing the few inconspicuous staminate 

 flowers above, and the ten to many pistillate flowers below, the 

 bracts awl-shaped, elongate, those of the lower spikes, at least, 

 usually conspicuous, but much shorter than the heads ; perigy- 

 nium ascending or spreading, about 3.25 mm. long and 2 mm. 

 wide, the body ovate, flattened, margined, round- tapering at base, 

 tapering into the serrulate, bidentate beak, which occupies one 

 half the length of the perigynium, nerveless on the inner face, 

 nerved on the outer ; scales ovate, hyaline with a green midrib, 

 acuminate to cuspidate, the body about the length of the body of 

 the perigynia, but somewhat narrower; achene lenticular, oblong- 

 orbicular, 2 mm. long, very short-stipitate ; stigmas 2. 



Heretofore referred to the 



rfih 



Dewey, but always with doubt ; this species may be distinguished 

 from that species, as well as from the polymorphous Carex Muhlen- 

 bergii Schkr. and Carex gravida Bailey, as follows : 



