PIPER FLOEA OF THE STATE OF WASHINGTON. 99 



NAIADACEAE. 



Carpels several to each flower. 



Flowers perfect, peduncled; leaves opposite Ruppia. 



Flowers monoecious; leaves alternate Zannichellia. 



Carpels solitary; flowers monoecious or dioecious. 



Leaves opposite or whorled, denticulate Naias. 



Leaves alternate, entire, long-linear. 



Monoecious ; ovaries pendulous Zostera. 



Dioecious; ovaries ascending Phyllospadix. 



RUPPIA. 



Sheaths 6 to 8 mm. long; fruit 2 mm. long 1. R. maritima. 



Sheaths 12 to 30 mm. long; fruit 3 to 4 mm. long 2. K. occidentaUs. 



1. Ruppia maritima L. Sp. PI. 1: 127. 1753. 

 Type locality: European. 



Range: In brackish water, nearly cosmopolitan. 



Specimens examined: Clallam County, Elmer 2797; Whidby Island, Gardner 348; 

 Anacortes, Henderson, July, 1892; Ocosta, Henderson, June, 1892; Seattle, Piper 2863. 



2. Ruppia occidentalis S. Wats. Proc. Am. Acad. 26: 138. 1890. 



Type locality: "In sa)ine ponds near Kamloops, British Columbia." Collected by 

 Macoun. 



Range: British Columbia to Washington and Nebraska. 

 Specimens examined: Lake Chelan, LaJce & Hull. 



ZANNICHELLIA. 



1. Zannichellia palustris L. Sp. PI. 2: 969. 1753. 



Type locality: " Habitat in Europae, Virginiae fossis, fluviis." 



Range: Throughout most of North America. Europe. Asia. 



Specimens examined: West Klickitat County, Suksdorf 2174; Junction Crab and Wil- 

 son Creeks, Sandberg & Leiberg 264; Marshall Junction, Piper, July 2, 1896. 



NAIAS. 



1. Naias flexilis (Willd.) Rostk. & Schmidt, FI. Sed. 384. 1824. 

 Caulinia flexilis Willd. Abh. Akad. Berlin 95. 1803. 

 Type locality: European. 



Range: Throughout most of North America. Europe. 

 Specimens examined: Green Lake, Piper; Lake Chelan, Elmer, September, 1897. 



ZOSTERA. 



1. Zostera marina L. Sp. PI. 2: 968. 1753. Eelgrass. 



Zostera oregana Wats. Proc. Am. Acad. 26: 131. 1891. 



Type locality: "Habitat in mari Balthico, Oceano." 



Range: Seacoasts, Alaska to California and Greenland to Florida. Europe. Asia. 



Specimens examined: Grays Harbor, Henderson 2471 ; Orchard Point, Piper 2314. 



Eelgrass is very abundant at about low-tide mark all along the seashore, especially in 

 quiet water. Fruiting specimens are very rarely found. Better material for study is 

 much to be desired. 



