52 FLORA OF PHILADELPHIA. 



Bucks — Pipersville, Moyer (Ft.). Delaware — Swarthmore, Dr. J. S. 

 Brinton (B. C.)., Wawa (He.) (Ke.) (Li.), Haverford (Le.), Valley of 

 Darby Creek (B. Sm.), Kidley Creek, near West Chester pike (VP.). 

 New Castle — Brandywine, scarce. 

 S. Poa compressa L. Wire-grass, English Blue-grass. M. p. 141. Waste 

 places, cultivated ground and woods. Summer. 



59. PANICULABIA Fabr. Manna-grass. 



Spikelets ovate or oblong, 8 mm. long or less. 



Flowering scales very broad, obscurely, or at least not sharply nerved. 

 Panicle open, the branches ascending or spreading, often drooping. 

 Spikelets 3-5-flowered, lowest flowering scale about 2 mm. long. 



1. P. laxa. 

 Spikelets 5-12-flowered; lowest flowering scale about 3 mm. 

 long. 2. P. Canadensis. 



Panicle contracted, the branches erect. 3. P. obtusa. 



Flowering scales narrow, sharply and distinctly 7-nerved. 



Panicle elongated, its branches erect or appressed. 4. P. elongata. 

 Panicle not elongated, open, its branches spreading or drooping, 

 rarely erect. 

 Scales about 2 mm. long, obtuse or rounded at the apex. 



Spikelets 3 mm. long or less ; branches of the panicle often 



drooping. 5. P. nervata. 



Spikelets 4-6 mm. long; branches of the panicle ascending 

 or spreading. 6. P. Americana. 



Scales 2.5-3 mm. long, truncate and denticulate at the apex. 



7. P. pallida. 

 Spikelets linear, 12 mm. long or more. 



Flowering scales 4-5 mm. long, obtuse, equalling or exceeding the obtuse 



palet. 8. P. fmtans. 



Flowering scale 6-8 mm. long, shorter than the acuminate palet. 



9. P. acutiflora. 



1. Panictjlaria laxa Scribn. M. p. 143. In water or wet soil. Summer. 



Gloucester— Mickleton (He.). 



2. Panictjlaria Canadensis (Michx.) Kuntze. Rattlesnake-grass. M. p. 



143. Bogs and wet places. Summer. 



3. Panicularia obtusa (Muhl.) Kuntze. M. p. 143. Bogs near the coast. 



Summer. 



Burlmgton — Moorestown (Sts.), Atsion (Te.). Cam den — Kaighn 's 

 Swamp, Mart. (B. C), Ancora (Te.), Lindenwold, Clementon, Haddon- 

 field (VP.). Gloucester— Near Mickleton (He.), Paulsboro (Ja.), Tom- 

 lin (Ke.), Swedesboro (Li.). Atlantic— Hammonton (Fr.) (Ke.), Egg 

 Harbor (Ke.). Ocean— Toms Biver (Te.). 



New Castle— St. George's and Duck Creek, Commons; Thompsons, Tat- 

 nall; Canal near Delaware City, Tatnall and Commons. 



4. Panicularia elongata (Torr.) Kuntze. M. p. 143. Wet woods. Sum- 



mer. 

 Bucks— Bock Hill (Fr.). Delaware— Tinicum, Aubrey H. Smith (B. 

 Sm.). Lancaster— (P.). Northampton— Wind Gap, Pen Argyl (He.). 

 Monmouth— Holmdel (C). Hunterdon— Stockton (C). 



5. Panicularia nervata (Willd.) Kuntze. M. p. 144. Moist meadows. 



Summer. 



