80 Karl M. Wiegand and Arthur J. Eames 



29. Dilepyrum Michx. 

 1. D. erectum (Schrcb.) Far well. (Brachyelytrum aristahim of Cayuga Fl. B. 

 erectum of Gray's Man., ed. 7.) 



Ravines and low woodlands, in rich rocky or gravelly, somewhat calcareous, 

 soils ; frequent. June 20-July. 



Enfield Glen; Six Mile Creek; Cascadilla woods; Fall Creek; Taughannock Gorge; 

 McLean Bogs ; Beaver Brook ; and elsewhere. 



Newf. to Minn., southw. to Ga. and Kans., with but few stations on the Coastal 

 Plain. 



Dudley's entry of var. Engelmanni was probably an error. Farwell (Amer. Mid. 

 Nat. 8: 33. 1922) has pointed out that the name Dilepyrum is the proper one for this 

 genus, though his second argument, about glumes, seems not to hold. At any rate, 

 the Muhlenbergia part of Michaux' genus already had a name, and D. erection was 

 the only unnamed element. It should retain Michaux' name. 



30. Milium (Tourn.) L. 

 1. M. effusum L. 



• Low or wet woodlands, in gravelly or mucky rich calcareous soils ; locally frequent. 

 June. 



Headwaters Swamp; Michigan Hollow Swamp (D. !) ; s. of Mecklenburg; Fall 

 Creek, above Forest Home; Six Mile Creek; Slaterville Swamp; Mud Creek, Free- 

 ville; Malloryville Bog (D.) ; McLean Bogs (D. !) ; Beaver Brook (D.) ; Dryden- 

 Lansing Swamp (D.) ; East Genoa; arbor vitae swamp e. of Clyde; Spring Lake; 

 Crusoe Lake swamp ; Westbury Bog. 



Lab. to Ont., southw. to Mass., Pa., and 111. Found also in Eurasia. 



31. Oryzopsis Michx. 



0. Spikelets, excluding the awn, 3-4 mm. long ; leaves very narrow, involute. 



1. O. pungens 

 a. Spikelets, excluding the awn, 6-9 mm. long. 



b. Leaves nearly all crowded at base of culm, long, linear, stiff and erect, glaucous ; 

 panicle 5-12 cm. long, contracted. 2. O. asperifolia 



b. Leaves scattered on the stem, broad and soft, green ; panicle 7-25 cm. long, 

 branches somewhat spreading. 3. O. raccmosa 



1. O. pungens (Torr.) Hitchc. (O. Canadensis of Cayuga Fl.) 



Dry ravine crests, in sandy, perhaps slightly limy, soils ; rare. May-June. 



Taughannock Gorge, s. side below the falls (F. C. Curticel) and on "Eagle 

 Cliff" above the falls (D.) ; Shurger Glen, s. side (K. M. W. & L. H. MacDaniels). 



Lab. to Pa., and westw. to B. C. ; apparently including the northern Atlantic 

 Coastal Plain. 



2. O. asperifolia Michx. 



Dry woods, ravine slopes, and hills, in gravelly, somewhat calcareous, soils ; not 

 uncommon. Apr. 20-May. 



In nearly all the ravines of the basin, and in the less acid gravelly woods of the 

 hills ; also in the McLean region. 



Newf. to B. C, southw. to Pa., Minn., and N. Mex. ; occasional on the northern 

 Atlantic Coastal Plain. 



3. O. racemosa (Sm.) Ricker. (0. melanocarpa of Cayuga Fl.) 



Dry or damp wooded ravine slopes and hillsides, in more or less calcareous soils ; 

 frequent. July 15-Aug. 10. 



In nearly all the larger ravines of the basin ; also on the Caroline Pinnacles. 

 Me. to Ont., southw. to Md. and Ky. ; rare or absent on the Coastal Plain. 



