PIPER FLORA OF THE STATE OF WASHINGTON. 177 



their inclusion. Carex incisa Boott<' is based on Geyer's specimen collected in "rich 

 mould; thickets of the fertile plains above Colville." Tlie brief description is as follows: 

 "Differt a C. scabrata Schkuhr perigyniis laevibus, etc., squamis focmineis viscidis, etc., 

 F. B." It has not been identified. Carex rosea Schk., reported in Hooker's Flora b as 

 collected by Scouler 0:1 the Columbia River, has not since been found in this region. 

 Other species reported from the Columbia River in Hooker's Flora are C. s^ricto Lam. , 



0. angustata Boott, C. lagopodioiLes Schk. (C. tribuloides Wahl.) and C. straminea Schk. 

 As none of these have recently been collected, it is quite certain that the specimens will 

 be found to represent other species. 



ARACEAE. Arum Family. 

 LYSICHITON. 



1. Lysichiton camtschatcense (L.) Schott, Prodr. Aroid. 421. 1860. Skunk cabbage. 

 Symplocarpus Jcarntschaticus Bong. Mem. Acad. St. Petersb. VI. 2: 108. 1832. 

 Dracontium camtschatcense L. Sp. PI. 2: 968. 1753. 



Type locality: "Habitat in Sibiria." 



Range: Alaska to California and Idaho. Siberia. 



Specimens examined: Clallam County, Elmer 2780; Seattle, Piper, July, 1895; Silverton, 

 Bouck 174; upper Nisqually Valley, Alkn 210; Wenache Lake, Sandberg tfe Leiberg 642; 

 Yakima Pass, Watson 400; Nason City, Sandberg c6 Leiberg, July, 1893; Marshall Junction, 

 Piper, July, 1896; Davis Ranch, Kreager 295. 



Zonal distkibution : Transition. 



LEMNACEAE. Duckweed Family. 



Thalloid shoot with 1 root Lemna. 



Thalloid shoot with several roots Spieodela. 



LEMNA. 



Thalloid shoot nearly circular, 1.5 to 5 mm. long '. 1. L. minor. 



Thalloid shoot oblong, stalk-like at base 2. L. trisulca. 



1. Lemna minor L. Sp. PI. 2: 970. 1753. 

 Type locality: Europe. 



Range: Nearly cosmopolitan. 



Specimens examined: Whidby Island, Gardner 429; EUensburg, Piper, May, 1897; 

 North Yakima, Henderson 2534; Waitsburg, Horner, July, 1896; Meyers Falls, Kreager 515. 



2. Lemna trisulca L. Sp. PI. 2: 970. 1753. 

 Type locality: Europe. 



Range: Throughout North America. Asia. Europe. 



Specimens examined: Coupeville, Gardner 430; near Seattle, Tarleton. 



SPIRODELA. 



1. Spirodela polyrhiza (L.) Schleid. Linnaea 13: 392. 1839. 

 Lemna polyrhiza (L.) Sp. PI. 2: 970. 1753. 

 Type locality: Europe. 

 Range: Nearly cosmopolitan. 

 Specimens examined: Whidby Island, Gardner 428; Seattle, Piper, August, 1897. 



« Boott; Hook. Journ. Bot. 7: 377. 1869.. 

 &Hook. Fl. Bor. Am. 2: 212. 1839. 



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