40 FLORA OF PHILADELPHIA. 



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

 (He.)' MonmouthSquan Village, Seabright (C). 



19. ARISTIDA L. Triple-awned Grass. 



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 pxjrpurascens Poir. M.^ p. 95. Dry soil. Autumn. 



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



Burlington — Medford (St.). 



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



MonmouthSaxi(\j Hook, Keyport, Middletown (C). 



Neiv 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— BjheTTj, Mart. (B. C), "Wissahickon (VP.). Delaware 

 — Tinicum (Fu.), near Media (B. Sm.), Crum Creek (St.). Chester— 

 Oxford (Ca.). 



New Jersey— Common. 



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

 mons. 



21. OEYZOPSIS Michx. 

 1. Oryzopsis melanocabpa Muhl. Mountain Bice. M. p. 98. Eocky woods. 

 Summer. 

 Philadelphia— '^'issahiekon, C. E. Smith (Fu.). Buds— Hock 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 — Eosemont (C). 

 New Castle— V^ill 's Eock, Mount Cuba, Commons. 



