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. Berol. 79. 1809. 

 Type locality: "Habitat in America Iwreali." 



Range: Washington to Labrador south to Georgia. 



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



Zonal distribution: Arid Transition. 



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

 Scirpus lenticularisTorr. 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, Gardner 307; Seattle, Piper, June, 1891; Tacoma, 

 Fleit 206; Falcon Valley, Suksdorf 1267; Ellensburg, Whited, July, 1898; Egbert Springs, 

 Sandberg <k Leiberg 387; Railroad Creek, Elmer, September, 1897; Pcnd Oreille River, 

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

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

 <fc Cotton 227; Squaw Creek, Co«on 879. 



Zonal distribution: Transition. 



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

 Eleocharis pygmaea 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 1 . 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. E. gracUe. 



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

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



Type locality: Unalaska. 



Range: British Columbia to W^ashington, Newfoundland to Quebec. Europe. 



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

 Flett 207; Olympia, Henderson, May, 1892; Ilwaco, Henderson, August, 1886; Weiser 

 Lake, Suksdorf, July 21, 1890; Tacoma, Flett 2227; Ilwaco, Piper 4953. 



Zonal distribution: Humid Transition. 



The " E. vaginaium 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, Suksdorf 89; 

 Cascades 490, Lyall in 1860; Tweedy 41; Stevens Pass, Sandberg cfe Leiberg 789. 

 Zonal distribution: Arctic. 



3. Eriophorum gracile Rotli, Cat. Bot. 2: 259. 1800. 

 Type locality: Europe. 



