318 POACE^. 



about tlie same length, 3-nerved. short-awned on tlie back near the 

 apex ; palea nearly as long as its glume, 2-nerved or the nerves united 

 as one. Stamen 1 (2-3 in C. Bolanderi). Styles short, distinct. 

 Grain linear, oblong, included, but not adherent. 

 Tall perennial grasses with flat leaf-blades. 



Bentham says:- *' They have the tall reedlike habit of the large 

 species of Calamagrostis, but with a glabrous rachilla and the palea 

 with one nerve; the latter is a very remarkable character for the 

 tribe. They have but one stamen to the flower. Several other 

 grasses of America have been published as sjiecies of Cinna, but are 

 now referred to Bpicampes or Deyeuxia." 



There are three species, two of which are common to Xorthern 

 Europe and North America. 



Spikelets 5-6 mm. long 1 



Spikelets 3-3.5 mm. long o . . 2 



Spikelets about 2 mm. long, var. glomerata of number . . 2 



Spikelets -4.5-0 mm. loug, floret sessile » 3 



1. C. arundinacea L. Sp. PL 5 (1753). Agrosiis cinna Lam. 

 111. 1-:162 (1791). 31uhJenbergia citmaTrin. Diss. 1:191 (1821). 

 J/, pendida Bong. Yasey Mouog. 1. c. (1892). Bhjttia suaveolens 

 Fries, Mant. 2:2 (1839). 



Culms smooth, stout, simple, erect, 90-200 cm. high. Sheaths 

 mostly shorter than the 5-7 internodes ; blades flat, nearly smooth, 

 15-20 cm. long, 10-12 mm. wide. Panicle 15-10 cm. long, rays 

 smooth, in clusters of 3-6, flower-bearing mostly above the middle. 

 Spikelets green or purple, 5-6 mm. long, first 4-5 mm. long, sec- 

 ond 3-nerved, 5-6 mm. long; floral glume 4.5-5 mm. long, awn 

 obsolete or manifest. 



Northern States entirely across the continent. 

 Michigan, Cooley, Clark 694, Beat 62, 63, 64; Massachusetts, 

 Sturtevant. 



Swamps and moist woods. 



2. C. latifolia (Trev.) Griseb. Ledeb. Fl. Eoss. 4:435 (1853). 

 Agrostis latifolia Trevir. Goppert, Beschr. Bot. 82 (1830) ap. 

 Griseb. Muhlenhergia pendnla ]'.ong. Veg. Sitch. 172 (1833). 

 Cinna 2)endula Trin. Mem. Acad. St. Petersb. (VI.) 6: 280 (1841). 



