78 Bulletin VII. 1. 



ing glume about one-fourth shorter than the empty ones, mi- 

 nutely toothed at the truncate apex, awned on the back near the 

 middle; awn exserted and somewhat bent. 



This description is given here to cover a grass found along the 

 mountain road-side leading to White Cliff Springs, in. Monroe 

 county. It is certainly distinct from the Roane Mountain Agrostis 

 rubra Americana. Collected in July, 1890. 



8. Agrostis arachnoides Ell. Spider Bent. 



Plate XXVI. Figure 101. 



A slender annual (?) four inches to two feet high, with rather 

 short, narrow leaves, and capillary, spreading panicle. Sheaths 

 smooth, exceeding the internodes; ligule one to two lines long, 

 acute, cleft; leaf blade flat, two to three inches long, about one 

 line wide, the upper shorter and narrower. Panicle three to 

 twelve inches long, primary branches at the lower node about 

 five, usually in pairs above, widely spreading at maturity. Spike- 

 lets one-half to one line long; empty glumes nearly equal, scab- 

 rous on the keel; flowering glume a little shorter than the empty 

 ones, three-nerved, with two minute bristles at the truncate apex, 

 and a very slender flexuose, minutely pubescent awn on the back 

 above the middle; awn several times longer than the spikelet; 

 palea wanting or very minute. Dry, usually rather poor lands. 

 May— June. Of no value. 



9. Agrostis alba Linn. Herd's Grass or Red-top. 



Plate XXVI. Figure 102. 



A well-known perennial of variable habit. Culms smooth, erect 

 or decumbent, and rooting at the base or stoloniferous, one to 

 three feet high. Sheaths smooth; ligule less than a line to four 

 lines long, sometimes firm and herbaceous towards the base; leaf- 

 blade linear or narrow-lanceolate, four to eight inches long, scab- 

 rous. Panicle narrow and with erect and rather densely-flowered 

 branches, or lax and open, the branches widely spreading, four to 

 ten inches long. Spikelets nearly sessile or pedicellate, one to 

 one and one-half lines long. Empty glumes lanceolate, acute, the 

 first scabrous on the keel, the second a little shorter and smooth 

 or scabrous near the apex. Flowering glume a little shorter than 

 the empty ones, obtuse or truncate; palea one-half to three-fourths 

 as long as the floral glume. 



Agrostis vulgaris With. Fine Bent, is now united with A. alba L., 

 not being regarded as botanically distinct. A. vulgaris, however, 

 is a good agricultural form quite distinct from A. alba. Agrostis 

 stolonifera is also classed as only a variety of A. alba. Trinius re- 

 ferred these and also some others which have been classed as spe- 

 cies, to Agrostis polymorpha Huds. 



The forms we have may be separated as follows: 



Ligule I to 4 lines long, usually ribbed toward the base. 

 Panicle open, culms erect or geniculate at the lower joints. 



A. ALBA. 



