34a. Awns on the lemmas 12 mm. long or more 



Brome-grass, Bromus tectorum. 

 34b. Awns on the lemmas 8 mm. long or less, or none 



Cheat, Bromus secalinus. 



35a. Lemmas with 7 sharp conspicuous veins from base to apex 



Manna Grass, Glyceria nervata. 



35b. Lemmas with 3 5 inconspicuous veins 36. 



36a. Spikelets with 5 flowers or more 37. 



36b. Spikelets with 2 4 (rarely 5) flowers 40. 



37a. Stems tufted and decumbent at base (Love Grass) 38. 

 37b. Stems erect (Fescue Grass) 39. 



38a. Spikelets 1.5 mm. wide Loye Grass, Eragrostis pilosa, 



38b. Spikelets 3 mm. wide Love Grass, Eragrostis megastachya. 



39a. Lemmas with conspicuous awns Fescue Grass, Festuca octoflora. 

 39b. Lemmas without awns Fescue Grass, Festuca elatior. 



40a. Tufted annual grass Spear Grass ; Poa annua. 



40b. Perennials, with erect flowering stems 41. 



41a. Stems round Blue Grass, Poa pratensis. 



41b. Stems strongly flattened Canadian Blue Grass, Poa compressa. 



CYPERACEAE, the Sedge Family 



Grass-like or rush-like plants, with linear leaves or leafless, and 

 inconspicuous flowers in small chaffy spikes. 



Over 200 species occur in Michigan, of which only the commonest 

 are. included here. For the remaining species the Manuals should 

 be consulted. 



la. Spikes all alike 2. 



Ib. The uppermost spike or spikes wholly staminate, the lower one 

 or more pistillate; ovary and achene surrounded by a sac, the 

 perigynium. Mature fruit is necessary for satisfactory identi- 

 fication (Sedge) 12. 



2a. Stems leafless, bearing, one or more spikes at or near the 



top 3. 

 2b. Stems leafy 6. 



3a. Spike one, terminal and erect (Spike Rush) 4. 



3b. Spikes usually more than one, lateral and spreading 5. 



4a. Annual, with fibrous roots Spike Rush, Eleocharis obtusa. 

 4b. Perennial, with a running rootstock 



Spike Rush, Eleocharis palustris. 



5a. Stem round Bulrush, Scirpus Talidus. 



5b. Stem 3-cornered Three-square, Scirpus americanus. 



6a. Spikes axillary along the side of the stem 



Dulichium, Dulichium, arundinaceum. 



6b. Spikes terminal 7. 



