40 FLORA OF PHILADELPHIA. 



Salem— Salem. Cape May— Anglesea (He.). Ocean— Point Pleasant 

 (He.). Monmouth— Squan Village, Seabright (C). 



19. ARISTIDA L. Triple-awned Geass. 



Awns not articulated to the scale. 



Central awn coiled at the base. 1. A. dichotoma. 



Central awn not coiled at the base. • 



Spikelets exceeding 2 cm. long; first scale 5-7 nerved. 



2. A. oligantha. 

 Spikelets less than 1.5 cm. long; first scale 1-3 nerved. 



Sheaths glabrous, or pubescent only at the apex. 



First scale generally shorter than or equalling the second; 



3. A. gracilis. 

 First scale usually exceeding the second. 



4. A. purpurascens. 

 Sheaths, at least the lower ones, densely woolly. 



5. A. lanosa. 

 Awns articulated to the scale, united at the base into a spiral column. 



6. A. tuberculosa. 



1. Aristida dichotoma Michx. Poverty Grass. M. p. 94. Dry sandy soil. 



Late summer. 



2. Aristida oligantha Michx. M. p. 95. Dry soil. Late summer. 



Philadelphia — (P.). Delaware— Fawkes ' Eun (St.). 

 Camden — Clementon (VP.). 



3. Aristida gracilis Ell. M. p. 95. Dry soil. Late summer. 



4. Aristida purpurascens Poir. M.. p. 95. Dry soil. Autumn. 



5. Aristida lanosa Muni. M. p. 96. Dry sandy soil. Late summer. 



Burlington— Medf ord ( St. ) . 



6. Aristida tuberculosa Nutt. M. p. 96. Sandy soil. Autumn. 



Monmouth— Sandy Hook, Keyport, Middletown (C). 



New Castle— New Castle Cut-off; Shelpot Creek, Commons and Tatnall. 



20. STIPA L. 

 1. Stipa avenacea L. Black-oat Grass. M. p. 97. Dry woods. Summer. 

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

 — Tinieum (Fu.), near Media (B. Sm.), Cram Creek (St.). Chester— 

 Oxford (Ca.). 



New Jersey — Common. 



New Castle— Brandywine, Tatnall; Faulkland and Mount Cuba, Com- 

 mons. 



21. ORYZOPSIS Michx. 



1. Oryzopsis melanocarpa Muhl. Mountain Bice. M. p. 98. Rocky woods. 

 Summer. 

 Philadelphia— Wissahickon, C. E. Smith (Fu.). Bucks— Rock Hill 

 (Fr.). Montgomery— Sumneytown (VP.). Delaware— Mount Misery, 

 Lenni, L. L. Smith (B. Sm.). Berks— Below Reading, Mart. (B. C). 

 Lancaster— {P.). Northampton— Easton, Porter (B. C). 

 Hunterdon — Rosemont ( C. ) . 

 New Castle— Will 's Rock, Mount Cuba, Commons. 



