72 American Midland Naturalist Monograph No. 2 



and La Salle counties. Discovered at Canton by J. Wolf 



E. woljii Gray 



13. Achenes papillose or pitted. 



15. Tubercle depressed; achene about 1 mm. long; perennials with 

 rhizomes. 

 16. Stems filiform, about 0.5 mm. wide, angular; glumes obtuse; 

 wet ground, local. {_E. elliptica Kunth; E. capltata var. 



borealis Svens.] E. tenuis (Willd.) Schult. 



16. Stems flattened, 1 mm. or more in width; glumes acuminate, 

 often bifid; moist ground throughout 111. [E. acuminata 



(Muhl.) Nees} E. compressa Sulliv. 



15. Tubercle conical-subulate; achenes 1.5 mm. long (incl. the 



tubercle) ; glumes obtuse; tufted annuals with filiform stems; 



muddy shores, not common ...£. intermedia (Muhl.) Schult. 



12. Tubercle confluent with the top of the achene, long conical; achenes 



2-3 mm. long. 



17. Stems flattened, 1-2 mm. wide, 30-60 cm. long; marshes and 



shores, not common E. rostellata Torr. 



17. Stems somewhat 3-angled, filiform, less than 1 mm. wide, 5-30 cm. 

 tall; marshes and shores, n.e. III. [Scirpus pauciflora Liphtf.^ .... 

 E. pauciflora (Lightf.) Link 



5. BuLBOSTYLlS [Kunth] C. B. Clarke 



(Slenophplliis Raf.) 



B. capillaris (L.) C. B. Clarke. Sandy soil, n. 111., extending southw. to 

 Henderson and Kankakee counties; also apparently in Pope Co. [^Stenophyllus 

 capillaris (L.) Britt.} 



6. FuiRENA Rottb. — Umbrella Sedge 



F. pumila Torr. Shores, swamps, and wet meadows, n.e. 111. [F. squarrosa 

 sensu auth., non Michx.} 



7. Hemicarpha Nees 8C Arn. 



1. Spikelets 2-4 mm. long; glumes elliptical, the tips somewhat recurved; wet 



sandy soil, chiefly in the n. half of the state 



H. micrantha (Vahl) Britt. 



1. Spikelets 4-7 mm. long; glumes broadly ovate, appressed; wet sandy soil, n. 

 Ill M. drummondi Nees 



8. FlMBRISTYLIS Vahl 



1. Style 2-cleft; achenes lenticular, about 1 mm. long, brownish; spikelets ovoid 

 or ellipsoid, 5-10 mm. long; moist sandy soil, rare, n. 111. \F. puherula 

 (Michx.) Vahl] F. caroliniana (Lam.) Fern. 



1. Style 3-cleft; achenes trigonal, about 0.5 mm. long, whitish, the 3 angles 

 ridged; spikelets linear; moist sandy or alluvial soil, local. \F. autumnalis 

 sensu auth., non R. & S.] F. mucronulata (Michx.) Blake 



