. GSAMINEAE. 41 



22. MUHLENBEEGIA Schreb. 



Panicle contracted, narrow, spike-like, the short branches rarely spreading. 

 Flowering scale not awned, but sometimes awn-pointed. 



Outer scales not awned, about half as long as the flowering scale, 

 acute. 1. M. sobolifera. 



Outer scales long-acuminate, awn-pointed or awned. 



Outer scales about equal in length to the flowering scale, sharp- 

 pointed, about 3 mm. long. 2. M. Mexicana. 

 Outer scales exceeding the flowering scale, generally twice its 

 length, awned, about 5 mm. long. , 3. M. racemosa. 

 Flowering scale long-awned; awn usually twice the length of the scale, 

 sometimes shorter. 

 Outer scales about equalling the flowering scale. 4. M. sylvatica. 

 Outer scales one-half to> two-thirds as long as the flowering scale. 



5. M. tenuiflora. 

 Outer scales less than one-third the length of the flowering scale. 



6. M. diffusa. 

 Panicle open, its branches long and spreading. 7. M . eapillaris. 



1. Muhlenbergia sobolifeea (Muhl.) Trin. M. p. 99. Eocky woods. Late 



summer. 



Philadelphia— Byberry, Mart. (B., C), Wissahickon (VP.). Bucks— 

 Sellersville (Fr.). Montgomery — Lafayette, Schuylkill Valley (VP.'). 

 Delaware— (P.). Chester— (P.). Lancaster— (P.) . Northampton— 

 Easton, Porter (B. 0.). 



Hunterdon— Milford (0.)., 



New Castle— Brandywine, etc. Frequent. 



2. Muhlenbergia Mexicana (L.) Trin. M. p. 99. Low ground. Late ~y£ 



summer. i 



3. Muhlenbergia racemosa (Michx.) B. S. P. M. p. 99. Bogs and wet 



rocks. Late summer. . 



, Bucks— Durham, Muth (Ft.). Chester— (P.). Lancaster— (P.). 



4. Muhlenbergia sylvatica Torr. M. p. 100. Low or rocky woods. Late 



summer. 

 Philadelphia— (P.). Bucks— Sellersville (Fr.). Delaware — Concord 

 (W. Tr.). Chester— (P.). Lancaster— (P.). Lehigh— Salsburg (Kx). 

 Northampton — (P. ) . 



Gloucester— Swedesboro (Li.). Hunterdon— Clinton (Te.). 

 New Castle — Frequent. 



5. Muhlenbergia tenuiflora (Willd.) B. S. P. M. p. 100. Eocky woods. 



Late summer. 



Philadelphia— Wissahickon (He.). Bucks— Haycock (Fr.). Delaware 

 — Hey's Dam, Springfield, Dr. Geo. Smith (Fu.), Concord (W. Tr.), 

 Lewis Mill, Crum Creek (VP.). Chester— (P.) . Lancaster — York Fur- 

 nace (He.), Northampton— Easton, Porter (B. C). 



New Castle— Frequent. 



G. Muhlenbergia diffusa Willd. Drop-seed, Nimble Will. M. p. 100. Dry 

 hills and woods. Late summer. 



7. Muhlenbergia capillaris (Lam.) Trin. Hair-grass. M. p. 100. Dry 

 sandy soil. Autumn. 

 Lancaster— Gap (P.). 



A 



