306 American Midland Naturalist MorjocRAPH No. 7 



15. Tubercle conical-subulate; achenes 1.5 mm long 

 (incl. the tubercle) ; glumes obtuse; tufted an- 

 nuals with filiform stems; muddy shores, not 



common E. 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-anglecl, filiform, less than 1 mm wide, 



5-30 cm tall; marshes and shores, n.e. Ill 



E. pauciflora (Lightf. ) Link 



4. Bulbostylis [KunthJ C.B.Clarke 



B. capillaris (L. ) C.B.Clarke. Sandy soil, locally nearly through- 

 out 111. [Stenophyllus capillaris (L.) Britt.]. 



5. Fuirena Rottb. — Umbrella Sedate 



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

 squarrosa sensu auth., non Michx.]. 



6. Hemicarpha Nees & Arn. 



l.Spikelets 2-4 mm long; glumes elliptical, the tips somewhat re- 

 curved; wet sandy soil, local H. ynicrantha (Vahl) Pax 



l.Spikelets 4-7 mm long; glumes broadly ovate, appressed; wet 

 sandy soil, n. Ill H. drummondii Nees 



7. Lipocarpha R.Br. 



L. maculata (Michx.) Torr. Dry margins of ponds, rare; Mason 

 Co., R. T. Rexroat in 1957. 



8. Fimbristylis Vahl 



1. Perennial with rhizomes; stems 20-60 cm tall; leaves puberulent; 

 achenes lenticular, about 1 mm long; style 2-cleft; moist sandy 

 soil, local; known from Cook, Hancock, Henderson, Kankakee, 



and Lake counties. [F. puberida (Michx.) Vahl] 



F. drummondii Boeckl. 



1 . Annual with fibrous roots. 



2. Style 2-cleft; achene lenticular; lumber yard. Metropolis, Mas- 

 sac Co., H. E. Aides ..F. baldwiniana (Schultes) Torr. 



2. Style 3-cleft; achene trigonous; moist sandy or alluvial soil, 

 locally nearly throughout 111. [F. mucronulata (Michx.) 

 Blake) F. autumnalis (L.) R. & S. 



9. Scirpus L. — Bulrush 

 1. Involucral bract usually solitary, appearing like a continuation of 

 the stem, or lacking. 

 2. Spikelets solitary, rarely two. 



