LAMSON-SCRIBNER AND MERRILL GRASSES OF ALASKA. 55 



Plants 15 to 40 cm. high with contracted, densely flowered pani- 

 cles 1 . A . latifolia. 



Plants 60 to 120 cm. high with usually open, loosely flowered 

 panicles 2. A. arundinacea. 



1. Arctagrostis latifolia (R. Br.) Griseb. in Ledeb. Fl. Ross. 4: 434. 1853. 

 Colpodium latifolium R. Br. Suppl. App. Parry's Voy. 286. 1824. 



A rather stout, erect, glabrous grass with erect or ascending leaves and contracted, 

 usually purplish, rather densely flowered panicles 3 to 10 cm. long, the appressed 

 branches 3 to 5 cm. long, and mostly flower-bearing to the base; leaf blades 10 to 15 

 cm. long, 6 to 12 mm. wide; spikelets 3 to 5 mm. long; glumes unequal, shorter than 

 the obtuse, scabrous lemma. 



In damp soils, arctic Alaska, and the islands of Bering Sea to Cook Inlet, and east- 

 ward to Labrador and Greenland; also in northern Europe and Asia. 



2. Arctagrostis arundinacea (Trin.) Beal, Grasses N. Amer. 2: 317. 1896. 

 Vilfa arundinacea Trin. Gram. Unifl. 157. 1824. 



A stout, erect perennial, 60 to 120 cm. high with flat leaves and usually open, 

 diffusely flowered panicles, 15 to 35 cm. long; leaves scabrous, 15 to 25 cm. long, 

 about 10 mm. wide; panicles pale or purplish, the branches fasciculate, spreading 

 or ascending, often 6 to 10 cm. long, spikelets 2.5 to 6 mm. long. 



In wet soils throughout Alaska and in British America and northeast Asia. 



Trinius has an excellent illustration of this species a and there can be no doubt as 

 to the identity of the plaiu. It is, however, an exceedingly variable species, espe- 

 cially in vegetative characters. We have been unable to distinguish Arctagrostis 

 angustifolia Nash. The specimen in the National Herbarium collected by R. S. 

 Williams is certainly A. arundinacea^ although it is cited in the original description 

 of A. angustifolia. 



7. CINNA L. 



Cinna L. Sp. PI. 5. 1753. 



Spikelets 1-flowered; raohilla distinctly articulated below the glumes as well as 

 above them, produced below the floret into a short smooth stipe, and usually extend- 

 ing behind the palea as a slender naked bristle; lemma similar to the glumes, 3-ncrved, 

 usually with a short, subterminal awn. Tall perennial grasses with numerous flat 

 leaves and many-flowered, nodding panicles. 



1. Cinna latifolia (Trev.) Griseb. in Ledeb. Fl. Ross. 4: 435. 1853. 



Agrostis latifolia Trev. in Gopp. Beschr. Bot. Gart. Breslau 82. 1830. 



Muhlenbergia pendula Bong. Mem. Acad. St. Petersb. VI. Math. Phys. Nat. 2: 172. 

 1832. 



Cinna pendula Trin. Mem. Acad. St. Petersb. VI. Sci. Nat. 4: 280. 1841. 



Cinna arundinacea pendula A. Gray, Man. ed. 2. 435. 1853. 



A rather slender and smooth perennial 60 to 120 cm. high, with erect, simple culms, 

 long, flat leaves 4 to 12 mm. wide, and open nodding panicles 10 to 20 cm. long; 

 spikelets about 3 mm. long, with nearly equal, acute glumes and short-awned or 

 nearly awnless lemma raised on a short stipe. 



Thickets and moist woodlands, Kodiak Island and Cook Inlet to southeastern 

 Alaska, eastward to Newfoundland, and southward to North Carolina and Colorado; 

 also in northern Europe and Asia. 



Specimens examined: Revillagigedo Island, Howell 1712a; Seldovia, Trclease & 

 Saunders 2097; Juneau, Coville &• Kearney 2477, Cole in 1899; Yakutat, Piper 4702, 

 2714; Homer, Piper 4713; Kodiak, Piper 4712. 



«Gram. Icon. 1: pi. 55. 1828. 



