MIDDLESEX FLORA. 121 



C. straminea, Schk., var. invisa, Wm. Boott. 

 Mystic Pond, Winchester (L. H. Bailey, Jr.); Medford (Wm. 

 Boott) ; Medford " a form which is almost var. invisa," fide Bailey, 

 (F. S. Collins). 



C. straminea, Schk., var. ? 



"A singular form with which I am not acquainted," L. H. 

 Bailey, Jr. Wilmington, June 15, 1887 (F. S. Collins). 



Culms about 2 feet high, rather slender, smooth, roughish at top, 

 considerably exceeding the few (3 to 5) narrowly linear (2" wide, 

 6' to 10' long), taper-pointed, scabrous-edged leaves; spikes 3-5, 

 nearly globular (3"), the upper contiguous or distinct, the low- 

 est sometimes rather remote, the uppermost (5" long) abruptly and 

 conspicuously contracted at the long, staminate base, the others 

 little or not at all contracted ; perigynia spreading, from lanceolate 

 to rather broadly ovate, roundish or somewhat pointed at base, 

 moderately wing-margined, distinctly several-nerved on each side, 

 gradually tapering from the middle to the slightly bifid apex of 

 the rough-margined beak, a third longer than the scarious light- 

 brown ovate obtuse or blunt-pointed scale; achenium shining, 

 elliptic-ovate, long-apiculate below the green style, abruptly con- 

 tracted at the sessile base. Spikes pale-green and brownish. 

 Bracts short and filiform, or absent. Sheaths smooth. 



GRAMINE/E. GRASS FAMILY. 



PASPALUM, L. 



P. setaceum, Michx. 



Common. 



PANICUM, L. PANIC GRASS. 



P. filiforme, L. 



Generally distributed, but not common. 

 P. GLABRUM, Gaudin. 

 Not uncommon. Nat. from Eu. 



P. SANGUINALE, L. CRAB GRASS. FlNGER GRASS. 



Common in cultivated and waste ground. Nat. from Eu. 

 P. agrostoides, Spr. 



Frequent. 

 P. proliferum, Lam. 



Westf ord and Bedford (Dr. C. W. Swan) ; Waltham List ; Concord 



(E. S. Hoar) ; Maiden and Medford (F. S. Collins). 

 P. capillare, L. OLD-WITCH GRASS. 



Common. 



