60 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Calamagrostis yukonensis Nash is stated by the author to be related to Calamagrostis 

 tweedyi, but a most minute examination and comparison fails to reveal any points on 

 which C. yukonensis can be separated from C. purpurascens. The narrow leaves of the 

 plant described as Calamagrostis yukonensis do not form a valid distinguishing char- 

 acter, since in the specimens collected by McGrath, cited above, both narrow and 

 relatively broad leaves are found in the same innovation. In no other respect have 

 we been able to find any differential characters between Calamagrostis yukonensis and 

 C. purpurascens. 



4. Calamagrostis aleutica Trin. in Bong. Mem. Acad. St. Petersb. VI. Math. Phys. 



Nat. 2: 171. 1832. 



A stout, erect perennial, 60 to 150 cm. high, with long, rather stiff, flat leaves and 

 densely many-flowered, narrow panicles 15 to 30 cm. long; spikeleta 5 to 6 mm. long; 

 glumes acuminate, somewhat exceeding the lemma; awn barely equaling the lemma; 

 callus hairs few and short. 



In rocky or marshy places in the Aleutian Islands to southeastern Alaska, and along 

 the coast to California. 



Specimens examined: Unalaska, Mertcns (from Herb. Acad. St. Petersb.), Kellogg 

 111, Applegale, Evans 515, Harrington in 1871-72; Sitka, Mertens (from Herb. Acad. 

 St. Petersb.), Evans 790; Wrangell, Evans 149; Yes Bay, Behm Canal, Howell 1713. 



5. Calamagrostis langsdormi Trin. Gram. Unifl. 225. pi. 4.f. 10, 1824. 



A stout, erect perennial GO to 120 cm. high, with long, flat leaves and open, pyramidal 

 panicles 4 to 12 cm. long; spikelets 4 to 6 mm. long; glumes lanceolate, strongly Bcab- 

 rous or strigose; callus hairs copious, soft, the longer ones exceeding the lemma. 



In moist meadows throughout Alaska, eastward to Greenland and southward in the 

 mountains to North Carolina and New Mexico; also in northern Europe and Asia. 



6. Calamagrostis canadensis (Michx.) Beauv. Ess. Agrost. 157. 1812. Bluejoint. 

 Arundo canadensis Michx. Fl. Bor. Amer. 1: 73. 1903. 



An erect, glabrous, or scabrous perennial, 50 to 180 cm. high, with numerous leafy 

 innovations and oblong-ovate, open or somewhat contracted panicles 10 to 20 cm. in 

 length; spikelets 3 to 3.5 mm. long; glumes lanceolate, acute, scabrous; lemma about 

 2.5 mm. long, bearing a slender, straight awn 1 to 2 mm. in length. 



Wet meadows and margins of lakes and streams on the upper Yukon, eastward to 

 Labrador, and southward to North Carolina and New Mexico. 



Specimens examined: Dawson, Williams in 1899; Yukon River, Funston 159; Fort 

 Yukon, Georgeson 27; Eagle, Georgeson 32; White River, Gorman 1149. 

 6a. Calamagrostis canadensis acuminata Vasey; Scribn. U. S. Dept. Agr. Div. 

 Agrost. Bull. 5: 26. 1897. 

 A doubtful subspecies with rather small, more flexuous, and more densely flowered 

 panicles, narrowly acuminate glumes, and somewhat larger spikelets (3.5 to 4 mm. 

 long), approaching C. langsdorffii. 

 Range of the species. 



Specimens examined: Alatna River, Schroder in 1899; Circle City, Osgood in 1899; 

 Kodiak Island, Sturgeon River, Coville & Kearney 2252; Kukak Bay, Alaska Penin- 

 sula, Coville 6c Kearney 1195. 



This subspecies represents a transition from Calamagrostis canadensis to C. langs- 

 dorffii, the extreme form being separated from the latter only by its slightly shorter 

 spikelets, shorter awn, and less scabrous glumes. 



Calamagrostis alaskana Kearney, U. S. Dept. Agr. Div. Agrost. Bull. 11: 32. 

 1898, can only be distinguished from C. canadensis by its more contracted panicles and 

 shorter panicle branches. It is represented by the following specimens: Yukon 

 River, Funston 157; Bennett City, Williams in 1899; Port Clarence, Brewer & Coe 395. 



