TnK (tKASsKs OK Tknnksskk. loJ) 



6. Poa autumnalis Mulil. (/'. jUxuosa Mulil.) 



IMat.' WW 1 1. Kii^Mirr I4r,. 



A slender perennial, with erect stems one to three feet hi^h. flat 

 leaves and an open, rather few-flowered panicle. Sheaths smooth; 

 ligule about one-half a line lonj^; leaf-blade three to eight inches 

 loni;-, mostly less than a line wide, scabrous, gradually tapering to 

 a slender, acute apex. Panicle four to five inches long, the long 

 flexuose. filiform branches in twos or threes, with the few spike- 

 lets clustered at the ends. Spikelets oblong, ovate, obtuse, two to 

 three lines long, three- to five-flowered; first empty glume one- 

 nerved, the second a little longer, broader, and obtuse; flowering 

 glumes about three-fourths of a line long, narrowly lanceolate, 

 hyaline or scarious at the obtuse apex, distinctly five-nerved, the 

 midnerve or keel hairy for its whole length, the dorsal surface 

 pubescent near the base, but with no web. Palea two-keeled, keels 

 scabrous or pubescent. 



This grass has long been known as Poa flexuosa Muhl., not of 

 Smith nor of Wahlenberg. It is most frequent in dry woods, but 

 Gattinger reports it as growing on damp ground, and borders 

 of ponds, especiall}^ in the highlands. June — July. 



7. Poa sylvestris Gray. Woodland Blue-grass. 



Plate XXXVII. Figure 147. 



A slender, tufted perennial one to three feet high. vStems 

 slightly flattened, erect. Sheaths scabrous or sometimes smooth; 

 ligule one-half to one line long: leaf-blade three to eight inches 

 long, one to two and one-half lines wide, scabrous on the upper 

 surface, smooth beneath, acute. Panicle open, three to eight 

 inches long, primary branches in clusters of three to six, spread- 

 ing or reflexed. Spikelets ovate, one to one and one-half lines 

 long, two- to four-flowered, shorter than the pedicels. Empty 

 glumes slighth' unequal, the first one- the second three-nerved; 

 flowering glu:nes ovate obtuse, five-nerved, villous on the keel for 

 its whole length and on the marginal nerves below the middle, near 

 the base the entire dorsal surface minutely pubescent, only spar- 

 ingly webbed at the base. Palea two-keeled, keels villous. 



Common in rich open woodlands and along thicket borders. 

 April — May. 



s. Poa alsodes Gray. 



Plate XXXVII. Figure 14a 



A slender, erect perennial one to three feet high, with flat leaves 

 and a narrow, rather few-flowered panicle. Sheaths rather thin, 

 the upper somewhat scabrous; ligule one-half a line long or less; 

 leaf blade one to two lines wide, five to twelve inches long, scab- 

 rous, at least toward the acute apex. Panicle narrowly pyramidal, 

 the base for a time enclosed in the upper sheath, three to ten 

 inches long, primary branches in threes or fours at the rather dis- 

 tant nodes of the main rachis. Spikelets lanceolate, two- to three- 

 flowered, about two lines long; empty oflumes unequal, acute, the 



