82 



Fig. 60. Calamagrostis langsdorffii Trin. LANGSDORFF'S REED-BENT.— 

 a, The empty glumes; b, floret; c, the plumose rudiment or prolongation of the 

 rachilla. , Figs. 142 to 148, in Bui. 7, and 485 to 494, in Bui. 17, further illustrate 

 the genus Calamagrostis. 



60. CALAMAGROSTIS Adans. Fam. PI. 2: 31. 1763. Spikeletsl-flowered; 

 rachilla produced above the floret into a short, usually hairy pedicel or bristle. 

 Glumes 3, the first two nearly equal and empty, awnless, and usually exceed- 

 ing the 3d; 3d or floral glume usually more delicate in texture than the 1st 

 and 2d, surrounded at the base with copious hairs which sometimes equal or 

 exceed the glume in length, awned on the back usually from below the middle. 

 Palea more than half the length of its glume, faintly 2-nerved. Stamens 3. 

 Styles distinct. Grain inclosed by the floral glume and palea, and more or less 

 adherent. Tall, often reed-like, perennial grasses with small spikelets in 

 many-flowered, terminal panicles. 



Species about 120, very widely distributed over the world in the temperate 

 and arctic zones, and on high mountains Avithin the tropics. 



