190 



Cyperaceae 



Kyllinga 



50 



Map 356 



Cyperus ferruginescens Boeckl. 



o 50 



Map 357 



Cyperus esculentus L. 



462. KYLLINGA Rottb. 



1. Kyllinga pumila Michx. (Cyperus densicaespitosus Mattf. & 

 Kukenth. Pflanzenr. 20: 597. 1936.) Map 358. Infrequent in southern 

 Indiana and rare or absent from many of our northern counties. It is 

 usually found in moist or wet soil along streams, on bars in streams, along 

 ditches, and sometimes in cornfields along streams. 



Del., Ohio, 111. to Kans., southw. to Fla. and Tex.; also W. I., Mex., and 

 southw. 



466. ERIOPHORUM L. Cotton Grass 



Spikelets solitary; involucre none; scales lead color 1. E. spissum. 



Spikelets 2-several; involucre of 1-several leafy bracts. 



Leaves 1-2 mm wide, channeled their entire length; upper leaf blade shorter than 



its sheath; involucral bract 1; achenes ellipsoid, about 2.5 mm long 



2. E. gracile. 



Leaves 1.5-G mm. wide, fiat at least below the middle; involucral bracts more than 



1; achenes oblong-obovoid, mostly 2.5-3.5 mm long. 



Scales of spikelets with only 1 prominent rib ; stamens 3 ; plants of May and June. 



Upper leaf sheaths dark-girdled at the summit; midrib of scales not extending 



to the apex, the upper part of the scale hyaline and the rib prominent below 



the hyaline apex 3. E. angustifolium. 



Upper leaf sheaths not dark-girdled at the summit; midrib of scales extending to 



the apex 4. E. viridi-carinatu m . 



Scales of spikelets with several prominent ribs; stamen 1; bristles varying from 

 tawny to white; plants of August and September, beginning to flower about 

 July 15 5. E. virginicnm. 



1. Eriophorum spissum Fern. (Rhodora 27: 208-209. 1925.) (Erio- 

 phorum ccdlitrix of recent American authors, not Cham.) Map 359. Our 

 specimens were found in tamarack bogs. 



Baffinland and Lab. to Athabaska, southw. to Newf., N. S., N. E., mts. 

 of Pa., n. Ind., and Wis. 



2. Eriophorum gracile Koch. Map 360. Borders of sloughs in the dune 

 area and elsewhere in marshes and in sphagnum in bogs. 



