GEAMINEAE. 51 



58. PQA 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. 



. , * , j • • . ■ ■ . | 4. P. trivialis. 



Lateral nerves of the flowering scales pubescent. 



Intermediate neryes of the flowering scale obseure. 



2. P. flava. 

 Intermediate nerves prominent. 



Spikeleta crowded on the spreading or ascending 

 branches; mid-nerve of the flowering scale 

 pubescent .only below. . , , i 3. P. pratensis. 

 Spikelets scattered on the spreading, often re- 

 flexed branches ; mid-nerve pubescent its whole 



length, i ■ i 5. P. sylvestris. 



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



culms. .;..] i : , 7. P. brevifolia. 



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



1. .Boa annua L.<, Low Spear-grass- M. p. 138. , Cultivated and waste 

 'ground. 'Spring. 



2. Poa flava L. False Bed-top, Fowl Meadow-grass. M. p. 139. Swampy 



places.. Summer. ,,. , ,,,, -,. . , ,. ., ,, H ,,,,., ■ , ,,,,.. 



Bucks— Durham, Suth. Delaware— tipper Darby, Dr. Geo. Smith (Fu.). 

 Northampton — (P.). -"'''■ ■■■-.'■ ,<■"'-■ , , o 



Cam^em-Ty Ballast (He.). ' Gloucester— Mickleton (He.), Eepaupo (Ja.), 

 Swedesborp (Li.),, , ., . i . , ., 



New Castle— River Shore, Holly Oak, Commons. 



3. Poa pratensis L. r ,, June-grass, Kentucky Blue-grass. M. p. 139. Dry 



soil. Summer. , 



4. Poa trivialis L. M. ,p. 139. Meadows and, waste places. .Summer. 



Philadelphia— Ballast, E. Difenbaugh (B. C). , Bucks— Sellersville 

 (Fi\). Delaware— Swarthmore (B. Sm.). Chester— Paoli (Te.). Lan- 

 caster — (P.). Northampton— (P.). 



Gloucester — Mickleton, (He.), Tomlin (Ja.), Swedesboro (Id.), Timber 

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



5. Poa sylvestris A. Gray. M. p. 139. Thickets, and meadows. Early 



summer. ,..;,.,,..,; i 

 Philadelphia — (P.). Bucks — Nockamixon, A. P. Garber (P.), Dela- 

 ware— Swarthmore, E.T. Oresson,.Jr. (B. Sm.). Ches ter— Yalley Forge 

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

 6. ; Poa autumnalis MuM.-.. M- P- 140. Dry woods, Spring. ■■: ,y 



Bucks— ■Nockamixon (Fr.). Lancaster— Bart and Martic townships 



(P-)> .' . .; ,..• ■., > t i. ' 



New ■ Cqstle, — Harvey, opposite Bancrofts, .Commons; Brandywine, 



Canby. ; :,,... ;. 



7. Poa brevifolia Muhl. M. p. 140. Rocky wopda. Spring. ; . 



Philadelpltia—Wiasahicko-n, Mart. (B. C), Robinson's Knoll (Te.). 



