I ! 



(Fig. 469.) 



GRASS FAMILY, 

 ii. Poa glauca Vahl. Glaucous Spear-grass. 



Poa glauca Vahl, Fl. Dan. pi. 964. 1790. 



Poa cassia J. E. Smith, Eng. Bot. pi. 77/9. 1807. 



Culms 6 / -2 tall, erect, simple, rigid, glabrous, 

 somewhat glaucous. Sheaths overlapping, confined 

 to the lower half of the culm; ligule \" long; leaves 

 i'-2 x long, \" wide or less, smooth beneath, scabrous 

 above; panicle i'-$ f in length, open, the branches 

 erect or ascending, %'-!%' long; spikelets 2-4- 

 flowered, 2> // -3 // long; empty basal scales acute, 

 3-nerved, glabrous, rough on the upper part of the 

 keel; flowering scales \W-\^" long, obtuse or acut- 

 ish, rough, not webbed at the base, the lower half of 

 the midnerve and marginal nerves silky-pubescent, 

 the intermediate nerves obscure and occasionally 

 sparingly pubescent at the base. 



White Mountains of New Hampshire. Also in Europe. 

 Summer. 



12. Poa nemoralis L. Wood Meadow-grass. 

 Northern Spear-grass. (Fig. 470.) 



Poa nemoralis L,. Sp. PI. 69. 1753. 



Poa caesia var. slrictior A. Gray, Man. Ed. 5. 639. 1867. 



Culms 6'-2 tall, erect, simple, sleader, sometime* 

 rigid, smooth and glabrous. Sheaths usually shorter 

 than the internodes; ligule #"-i" long, truncate; 

 leaves i'-4' long, i" wide or less, erect, smooth or 

 rough; panicle a'-s' in length, open, the branches 

 erect or ascending, rarely spreading, i'-2' long; spike- 

 lets 2-5-flowered, iW-iW long; lower scale* acute 

 or acuminate, 1-3 -nerved; flowering scales obtuse or 

 acute, i // -iX // long, faintly 5-nerved, somewhat webbr 

 at base, the midnerve and the marginal nerves silky- 

 pubescent on the lower half. 



Anticosti Island to British Columbia, south to Maine, 

 Minnesota, South Dakota, and in the i 

 to Colorado. Also in Europe and Asia. Summer. 



13. Poa flava L. False Red-top. Fowl Meadow-grass. 



Poaflava L. Sp. PI. 68. 1753. 



Poa serotina Ehrh. Beitr. 6: 83. 1791. 



Culms i}4-s tall, erect, simple or rarely 

 branched, smooth, glabrous. Sheaths usually 

 shorter than the internodes, smooth and gla- 

 brous; ligule i // -2 // long; leaves 2 / -6 / long, 

 \"-2" wide, smooth or rough; panicle 6 / -i3 / 

 in length, open, the branches spreading or as- 

 cending, 2 / -5 / long, divided and spikelet-bear- 

 ing above the middle; spikelets 3-5-flowered, 

 l%"-2" long, exceeding their pedicels; lower 

 scales acute, glabrous, rough above on the 

 keel, the lower usually i-nerved, the upper 

 3-nerved; flowering scales obtuse, somewhat 

 webby at the base, i"-!^" long, silky-pubes- 

 cent on the lower half of the marginal nerves 

 and the midnerve, the intermediate nerves ob- 

 scure or wanting. 



In swampy places, Nova Scotia and New Brunswick to Vancouver Island, south to > 

 Illinois and Nebraska. Also in Europe aud Asia. July-Aug. 



Jcmy. 



