PIPER FLORA OF THE STATE OF WASHINGTON. 159 



Range: Washington to Newfoundland, south to Cahfornia and IVnnsylvania. Europe. 

 Asia. 



Specimens examined: Seattle, Piper 776; Mount Adams, Henderson, Jul}^ 1892; 

 Mount Stuart, Elmer 1138; Seattle, Smith 1016; Coulee City, Piper 3857; Priest Rapids, 

 Cotton 1380. 



Zonal distribution: Upper Sonoran to Iludsonian. 



HEMICARPHA. 



Scales erect or spreading only at the tips, little exceeding the akenes.. . 1. 77. micrantha. 

 Scales spreading, 2 to 3 times as long as the akenes. 



Akenes black; scales broad, abruptly acuminate 2. H. aristulata. 



Akenes brown; scales narrow, gradually attenuate 3. //. occideniaiis. 



1. Hemicarpha micrantha (Vahl) Britton, Bull. Torr. Club 15: 104. 1888. 

 Flemicarpha subsquarrosa Nees; Mart. Fl. Brasil 2^: 61. 1842. 



Scirpus micrantha Vahl, Enum. 2: 254. 1805. 



Type locality: "Habitat in America meridionalir' 



Range: Washington to New England and south into South America. 



Specimens examined: Falcon Valley, Sulcsdorf 811, 88. 



2. Hemicarpha aristvdata (Coville) A. Nelson, Bull. Torr. Club 29: 400. 1902. 

 Hemicarpha micrantha aristulata Coville, Bull. Torr. Club 21: 36. 1894. 

 Hemicarpha intermedia Piper, Fl. Palouse Reg. 36. 1901. 



Type locality: Texas. 



Range: Washington to Texas. 



Specimens examined: Almota, Piper 2375. 



3. Hemicarpha occidentahs A. Gray, Proc. Am. Acad. 7: 391. 1868. 

 Type locality: Yosemite Valley, California. 



Range: Washington to California. 



Specimens examined: Falcon Valley, SnL-sJorf 87 . 



ELEOCHARIS. Spike rush. 



Styles 2-cleft; akenes biconvex. 

 Tul)ercles constricted basally. 



Annual, roots fibrous; akenes black I.E. capiiata. 



Perennial with rootstocks; akenes brown 2. E. palustris. 



Tubercles not constricted basally; annuals. 



Heads ovoid; bristles longer than the akenes 3. E. obtusa. 



Heads oblong; bristles not longer than the akenes i. E. monticola. 



Styles 3-cleft; akenes 3-angled. 



Tubercles broad and short; akenes ribbed 5. £". acicularis. 



Tubercles subulate ; akenes smooth 6. £■. rostellata. 



1. Eleocharis capitata (L.) R. Br. Prodr. Fl. Nov. Holl. 1: 225. 1810. 

 Scirpus capitatus L. Sp. PI. 1 : 48. 1753. 



Type locality: "Habitat in Virginia." 



Range: Washington to Maryland and Florida. 



Specimens examined: Lake Chelan, Lake & Hull, August, 1892. 



2. Eleocharis palustris (L.) Roem. & Sclnilt. Syst. 2: 151. 1817. 

 Scirpus palustris L. Sp. PI. 1: 47. 1753. 



Type locality: European. 



Range: Subarctic and Temperate North America. Europe. Asia. 



Specimens examined: W^est Seattle, Piper, May, 1891; Smith 1006; Seattle, Smith, 



