33a. Lemmas, exclusive of the awn when present, 8 mm. long or more --34. 33b. Lemmas, exclusive of the awn when present, 6 mm. long or less --35. 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 =Love 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. 1a. Spikes all alike --2. 1b. 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 identification (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 validus.= 5b. Stem 3-cornered =Three-square, Scirpus americanus.= 6a. Spikes axillary along the side of the stem =Dulichium, Dulichium, arundinaceum.= 6b. Spikes terminal --7. 7a. Spikes subtended by long conspicuous leaves which greatly exceed the flower clusters --8. 7b. Spikes not conspicuously exceeded by the bract-like leaves --10. 8a. Spikes in a dense head-like cluster, white-woolly at maturity =Cotton Grass, Eriophorum virginicum.=