GEAMINEAE. 43 



First scale about equalling the second. 



Perennials; culms from long rootstocks. 6. S. Torreyanus. 



Annuals; roots fibrous, no rootstocks. •>>■ 7. S. serotinus. 



1. Sporobolus asper (Michx.) Kunth. M. p. 104. In dry soil. Autumn. 



Lancaster— (P. 1 )'.' ' ' ' ,: ' ""' : ■"" ' - ■'> "•"''■' 



2. Sporobolus longifqlius (Torr.) Wood. ,.M„ p. 105, In dry soil. Late 



summer. 

 Bucks— Nockamixon~(P.). Montgomery— (P.): Lancaster— (P.). 

 Northampton— (P.). Dauphin— {P.). 



3. Sporobolus vaginaeflorus (Torr.) Wood. M. p. 105. In dry soil. 



Summer. 



4. Sporobolus Indicus (L.) R. Br. ,M. p. 106. Ballast. Summer. 



Philadelphia— Navy Yard. 



Cam ken-i- Petty 's Island, I. Burk (Fu.). 



5. Sporobolus heterolepis A. Gray. M. p. 106. Dry soil. Summer. 



Lancaster— Pleasant Grove (Ca.), New Texas (P.). 



6. Sporobolus Torreyanus (E & S.) Nash. M. p. 107. Pine barrens. 



Autumn. 



7. Sporobolus serotinus (Torr.) A. Gray. M. p. 107. Sandy wet places 



in pine, barrens. Autumn. 



28. POLYPOGON Pes*. 



1. Polypogon Monspeliensis (L.)» Desf. 'Beard-grass. M. p.' 108. Bal- 

 last. Summer. 1 

 Philadelphia— Girard Point, I. Burk (He.). Bucks— (P.). 



29. CINNA ,L. /Wood Eeed Grass. 



Panicle narrow at maturity, its filif prm branches erect or drooping ; spikelets 

 4-5 mm. long; first scale much sporter than the second. 



1. C. arundinacea. 



Panicle open, its capillary branches flexuous and drooping ; spikelets 3 mm. 

 long; first scale about equalling the. second. 2, C. latifolia. 



1. Cinna arundinacea L. M. p. 108. Moist woods and shaded swamps. 



Summer. 

 Pennsylvania— General. 

 Camden— Camden (C). Gloucester— Mickleton (C). 



2. Cinna latifolia (Trev.) Griseb. M. pi 108. Damp woods. Late sum- 



mer. 

 Lancaster— Pequea, A. A. Keller (He.). 



30. AGEOSTI8 L. 



Palet conspicuous, at; least one-third as long as the scale. 1. A. alba. . 

 Palet inconspicuous, minute or wanting. 



Third scale awned. '' 2. A. canina. 



Third scale not awned, .or very rarely bearing a short awn. 



Culms weak, usually decumbent and often prostrate at base; leaves 



lax; spikelets 1.5 mm. long. 3. A. perennans. 



Calms and leaves erect. 



