GEAMINEAE. ' 45 



32. AMMOPHILA Host. 

 1. Ammophila arenaria (L.) Link. Sea Sand-reed. M. p. 114. Sandy 

 beaches. Summer. 



33. CALAMOVILFA Hack. 

 1. CALAMOVILFA BREViPiLLs (Torr.) Hack. Iteed-grass. M. p. 114. Sandy 

 swamps in pine barrens. Late summer. 



34. APERA Adans. 

 1. Apera Spica-venti (L.) Beauv. M. p. 115. Ballast. Summer. 

 FhiladelpMa—G\ra.r(i. Point, 7. Burk (He.). 

 Camden— Kaighn's Point, I. Burk (Fu.). 



35. HOLCUS L. 

 1. HoLCUs LANATUS L. Meadow Soft-grass, Velvet-grass. M. p. 115. 

 Fields, meadows and waste places. Summer. ' 



36. AIRA L. Hair-grass. 



Panicle open; flowering scales about 2 mm. long; plants 10-25 cm. tall. 



1. A. caryophyllea. 

 Panicle contracted; flowering scales 3 mm. long; plants 5-8 cm. tall. 



2. A. praecox. 



1. AiRA CARYOPHYLLEA L. M. p. 115. Fields and waste places. Early 



summer. 

 Philadelphia — Girard Point (Te.). 

 Salem — Salem (C). 

 New Castle— Townsend and State Road, Canhy; Deakynes, Commons. 



2. AiRA PRAECOX L. M. p. 116. Dry fields. Early summer. 



Lehigh— Salshurg (Kr.). Northampton— Bethlehem (P.). 



Burlington— Medtord (St.). Camden— Camden, Mart. (B. C), Glouces- 

 ter (C). Gloucester — yLullica Hill, Berkley (C), Mickleton, Timber 

 Creek (He.). Cape May— Ca^e May (C), Wildwood (He.), Anglesea 

 (Li.). Atlaiitic—Somers Point (C). 



AxRA CANESCENS L. Ballast. Philadelphia— Greenv^ich Point (Te.). 



AiRA COARCTATA Ehrh. Ballast. Camden— Kaighn's Point (He.). 



37. DESCHAMPSIA Beauv. Hair-grass. 



Flowering scales about 2.5 mm. long, erose-truncate ; leaves flat. 



1. D. caespitosa. 

 Flowering scales about 4 mm. long, acute or obtuse; leaves involute. 



2. D. flexuosa. 



1. DESCHAMPSIA CAESPITOSA (L.) Beauv. M. p. 116. In wet soil. Summer. 



SitcAs— Durham, Etith (Fr.). Chester— (P.). Lancaster— {P.). 



2. DESCHAMPSIA FLEXUOSA (L.) Trin. M. p. 116. In dry places. Summer. 



38. TRISETUM Pers. 

 1. Trisetum Pennsylvanicum (L.) Beauv. False Oat. M. p. 117. Low 

 grounds. Early summer. 



