158 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Range: Nova Scotia to Texas along the coast. Washington. 



Specimens examined: Seattle, Piper 1008; Clallam County, Elmer 2725; Admiralty 

 Head, 0. Piper, May 27, 1898. 



Zonal distribution: Humid Transition. 



11. Scirpus atrovirens Willd. Enum. Hort. Bcrol. 79. 1809. 

 Type locality: "llahitat in America boreali." 



Range: Wa.shington to Labrador south to Georgia. 



Specimens examined: Waitsburg, Piper, July, 1896; Uorner 19. 



Zonal distribution: Arid Transition. 



12. Scirpus microcarpus Presl, Rel. Haenk. 1: 195. 1828. 

 ScirpusleiitiadarisToiT. Ann. Lye. N. Y. 3: 328. 1836. 

 Scirpus sylvaticus digynus Boeckl. Linnaea 36: 727. 1870. 

 Type locality: Nootka Sound, Vancouver Island. 



Range: Alaska to Nova Scotia, south to California and New York. 



Specimens examined: Whidby Island, C'arcZ/ier 307; Seattle, Piper, June, 1891; Tacoma, 

 Flett 206; Falcon Valley, Suhsdorf 1267; Ellensburg, Whiied, July, 1898; Egbert Springs, 

 Sandberg & Leiherg 387; Railroad Creek, Elmer, September, 1897; Pend Oreille River, 

 Lyall in 1860; Spokane, Piper; Pullman, Piper, July 15, 1901; Clallam County, Elmer 

 2723; Mount Carlton, Ereager 298; Wenache Mountains, Whited 1366; Stehekin, Griffiths 

 cfc Cotton 227; Squaw Creek, Cotton 879. 



Zonal distribution: Transition. 



13. Scirpus nanus Spreng. Pug. 1: 4. 1815. 

 Eleocharis pyginaea Torr. Ann. Lye. N. Y. 3: 313. 1836. 



What is probably this species occurs on flat shores at the mouths of streams near Seattle 

 and elsewhere, but it is apparently always sterile. ' The presence of the characteristic 

 nodules on the roots seems to justify this determination. 



ERIOPHORUM. Cotton grass. 



Spike solitary; bristles coppery I- E. chamissonis. 



Spikes several; bristles white. 



Akene obovoid, obtuse; leaves flat, 3 to 8 mm. wide 2. E. polystachyon. 



Akene oblong, acute; leaves 3-sided, 2 to 4 mm. wide 3. £*. gracile. 



1. Eriophorum chamissonis C. A. Meyer in Ledeb. Fl. Alt. 1: 70. 1829. 

 Eriophorum russeelum Fries, Novit. Mont. 3: 170. 1842. 



Type locality: Unalaska. 



Range: British Columbia to Washington, Newfoundland to Quebec. Europe. 



Specimens examined: Whidby Island, Gardner 311; Seattle, Piper 684; Tacoma, 

 Flett 207; Olympia, Henderson, May, 1892; Ilwaco, Henderson, August, 1886; W'eiser 

 Lake, Suksdorf, July 21, 1890; Tacoma, Flett 2227; Ilwaco, Piper 49.53. 



Zonal distribution: Humid Transition. 



The "£■. m^ina^Mm L." of Suksdorf's list is based on an erroneous determination of the 

 above species. 



2. Eriophorum polystachion L. Sp. PI. 1: 52. 1753. 

 Type locality: European. 



Range: Alaska to Labrador south to Oregon and Georgia. Europe. Asia. 

 Specimens examined: Mount Rainier, Piper 1016, 2174; Mount Adams, Svlcsdoif 89; 

 Cascades 490, Lyall in 1860; Tiveedy 41; Stevens Pass, Sandberg & Leiberg 789. 

 Zonal distribution: Arctic. 



3. Eriophorum gracile Roth, Cat. Bot. 2: 2,59. 1800. 

 Type locality: Europe. 



