208 Cyperaceae Rhynchospora 



spikelets in terminal and axillary corymbose heads, perfecting only one flower; 



stamens 2; bristles 9-12 (20) 4. R. alba. 



Scales of spikelets chestnut color; spikelets perfecting more than one flower; 



stamens 3; bristles (5, rarely more. 

 Leaves all filiform; spikelets 3-6 in terminal clusters. 



Bristles barbed 5. R. capillacea. 



Bristles not barbed 5a. R. capillacea f. leviseta. 



Leaves wider, flat; spikelets numerous in clusters or heads. 



Bristles barbed 6. R. glomerata var. minor. 



Bristles not barbed 6a. R. glomerata var. minor f. discutiens. 



1. Rhynchospora macrostachya Torr. (Rynchospora corniculata in part, 

 of Britton and Brown, Illus. Flora, ed. 2.) Map 412. Very local in a few 

 counties of the lake area on the sedge borders of lakes and sloughs. 



Mass. to Mich., southw. to Fla. and Tex. 



2. Rhynchospora corniculata (Lam.) Gray var. interior Fern. (Rho- 

 dora 20 : 140. 1918.) Map 409. This is a tall, coarse sedge found growing in 

 wet woods and roadside ditches in a few of the Ohio River counties. Very 

 local. 



Ind., southw. to Ala., Ark., and Tex. 



3. Rhynchospora cymosa Ell. Map 410. This species has been reported 

 from Lake and Porter Counties. In the herbarium of the University of 

 Wisconsin there are 2 sheets from Lake County and 4 sheets from Porter 

 County collected by Umbach. These specimens were found in wet, sandy 

 soil along sloughs and in bogs.* 



N. J., Pa. to 111., southw. to Fla. and Tex. 



4. Rhynchospora alba (L.) Vahl. Map 406. Mostly in the lake area. 

 Infrequent in sedge marshes and bogs, usually on the borders of lakes. 



Newf. to Alaska, southw. to Fla., Ky., and in n. Calif. 



5. Rhynchospora capillacea Torr. Map 407. Local in marly, springy 

 places in the lake area, usually associated with the preceding species and 

 with Scleria vertidllata. 



N. B., e. Que. to w. Ont., southw. to N. J., Pa., Ohio, Ind., and Mo. 



5a. Rhynchospora capillacea f . leviseta (E. J. Hill) Fem. (Rhodora 37 : 

 252. 1935.) Map 408. Local in a few of the northern counties. Usually 

 found on marly borders of lakes and in interdunal flats. 



Maine, Ont., Mich., and Ind. 



6. Rhynchospora glomerata (L.) Vahl var. minor Britt. (Rhodora 37: 

 401-402. 1935. ) (Rynchospora glomerata of Gray, Man., ed. 7 and Britton 

 and Brown, lllus. Flora, ed. 2.) Map 411. Infrequent in wet or moist sedge 

 borders of lakes and in interdunal flats. This is our most common species 

 of this genus and at a short distance it might be confused with Cladium 

 mariscoides but the latter is much stiffer in habit. 



N. B. to Ont. and Mich., southw. to Fla. and Tex. 



* Collected in Newton County in H»38 by Madge McKee in swampy land about 3 

 miles northwest of Morocco. Specimen in her herbarium. 



