332 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



11. Agrostis 



Culms slender, 



Figure 666.-^4, Agrostis tenuis 

 floret, and ligule, X 5. 

 aristata. Floret, X 5. 



Panicle, X 1; glumes, 

 (Waghorne, Newf.) B, Var. 

 (Gayle 786, Maine.) 



Figure 667. Distribution of 



Agrostis tenuis. 



tenuis Sibth. Colonial bent. (Fig. 666, A.) 

 erect, tufted, usually 20 to 40 cm tall, with short 

 stolons but no creeping rhi- 

 zomes; ligule short, less than 1 

 mm or on the culm as much 

 as 2 mm long; blades mostly 

 5 to 10 cm long, 1 to 3 mm 

 wide; panicle mostly 5 to 10 

 cm long, open, delicate, the 

 slender branches naked below, 

 the spikelets not crowded. Ql 

 (A. vulgaris With.) — Cultiva- 

 ted for pastures and lawns in 

 the northeastern United States; 

 escaped and well established 

 throughout those regions; New- 

 foundland south to Maryland, West Virginia, and Michigan; British 

 Columbia to California (fig. 667); Europe. This species appears not 

 to be native in America; it has been referred 

 to A. capillaris L., a distinct species of Europe. 

 In older works this has been called Rhode 

 Island bent. Forms of this species are some- 

 times called Prince Edward Island, New Zea- 

 land, and Rhode Island Colonial bent (non- 

 creeping forms) and Astoria and Oregon 

 Colonial bent (creeping forms). 



Agrostis tenuis var. aristata (Parn.) 

 Druce. (Fig. 666, B.) Differing from A. tenuis in having lemma 

 awned from near the base, the awn usually geniculate and exceeding 

 the glumes. % — Fields and open woods, Nova 

 Scotia and Quebec to North Carolina; Alaska to Van- 

 couver Island; northern California; Europe. This 

 form appears to be native, at least in the more north- 

 erly part of its range. 



12. Agrostis humilis Vasey. (Fig. 668.) Culms 

 low, tufted, mostly not more than 15 cm tall; leaves 

 \J^ff mostly basal, the blades flat or folded, usually not 



Mj T more than 1 mm wide; panicle narrow, purple, 1 to 



V 3 cm long, the branches appressed to somewhat 



spreading; spikelets about 2 mm long; lemma nearly 

 as long as the glumes, awnless; palea about two 

 thirds as long as lemma. % — Bogs and alpine 

 meadows at high altitudes, Wyoming and Colorado 

 to Washington and Oregon (fig. 669). 

 13. Agrostis hendersonii Hitchc. (Fig. 

 670.) Annual; culms about 10 cm tall; 

 ligule 2 to 3 mm long; blades flat or loosely 

 involute, 1 to 3 cm long, about 1 mm wide; 

 panicle condensed, about 2.5 cm long, pur- 

 plish; spikelets short-pediceled, 5 to 6 mm 

 long; glumes subequal, setaceous- tipped ; lem- 

 ma about 3 mm long, finely 2-toothed, awned 

 from the middle, the awn about 1 cm long, 

 geniculate, the callus pubescent; palea obsolete. O —Wet ground. 

 Known only from Sams Valley, near Gold Hill, Jackson County, Oreg. 



Figure 668.— Agrostis 

 humilis. Panicle, X 

 1; glumes and floret, 

 X 5. (Type.) 



Figure 669.— Distribution of 

 Agrostis humilis. 



