GEAMINEAE. 51 



58. POA L. Meadow-grass, Spear-grass. 



Annual ; culms low and densely tufted, commonly less than 2 dm. 



1. P. annua. 

 Perennials; culms tall, usually exceeding 2 dm. 

 Culms tufted, usually densely so. 



Basal leaves much shorter than the culms'. 



Flowering scales not webby at the base. 6. P. autumnalis. 



Flowering scales webby at the base. 



Lateral nerves of the flowering scales glabrous. 



4. P. trivialis. 

 Lateral nerves of the flowering scales pubescent. 



Intermediate nerves of the flowering scale obscure. 



2. P. flava. 

 Intermediate nerves prominent. 



Spikelets crowded on the spreading or ascending 

 branches; mid-nerve of the flowering scale 

 pubescent only below. 3. P. pratensis. 



Spikelets scattered on the spreading, often re- 

 flexed branches; mid-nerve pubescent its whole 

 length. 5. P. sylvestris. 



Basal leaves very long, the early ones frequently as long as the 

 culms. 7. P. hrevifolia. 



Culms not tufted; rootstocks long, creeping. 8. P. compressa. 



1. PoA ANNUA L. Loiv Spear-grass. M. p. 138. Cultivated and waste 



ground. Spring. 



2. PoA FLAVA L. False Ped-top, Fowl Meadow-grass. M. p. 139. Swampy 



places. Summer. 



Buds — Durham, Puth. Delaicare — Upper Darby, Dr. Geo. Smith (Fu.). 

 Northampton — (P.). 



Camden— 'BaWast (He.). Gloucester— 'SUckleton (He.), Repaupo (Ja.), 

 Swedesboro (Li.). 



New Castle— Hiyer Shore, Holly Oak, Commons. 



3. PoA pratensis L. June-grass, Kentiicly Blue-grass. M. p. 139. Dry 



soil. Summer. 



4. POA TRIVIALIS L. M. p. 139. Meadows and waste places. Summer. 



Philadelphia— JiaWast, E. Difenbaugli (B. C). BmcA's— SellersviUe 

 (Fr.). Delaware— Swarthmore (B. Sm.). CVies^er— Paoli (Te.). Lan- 

 caster— (P.). Northampton— (P.). 



Gloucester— Mickieton (He.), Tomlin (Ja.), Swedesboro (Li.), Timber 

 Creek (Te.). Hunterdon— Fveqaent (C). 



5. PoA SYL\^ESTRis A. Gray. M. p. 139. Thickets and meadows. Early 



summer. 

 Philadelphia— (P.). jBwcAs— Nockamixon, A. P. Garher (P.). Dela- 

 W'are— Swarthmore, E. T. Cresson, Jr. (B. Sm.). C/ies/er— Valley Forge 

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



6. POA AUTUMNALIS Muhl. M. p. 140. Dry woods. Spring. 



Bucks — Xockamixon (Fr.). Lancaster — Bart and ]\[artic Townships 

 (P.). 



Neio Castle — Harvey, opposite Bancrofts, Commons; Braudywine, 

 Canby. 



7. POA BKEViFOLiA Muhl. M. p. 140. Rocky woods. Spring. 



Philadelphia — "Wissahiekon, Mart. (B. C), Robinson's Knoll (Te.). 



