2>7^ Muhlenbergia, Volume 2 



etc. A taller plant wilh larger spikes than tlie type, but much 

 less common. June, Jul)'. 



Carex umbellata Schk. 4. Matted sedge. Infrequent in 

 dry ground south of Klk Rock. April to July. 



Carex stipata j\Iuhl. 4. Awl fruited sedge. Fairly com- 

 mon in moist open woods and wet ground. East Portland and 

 about Oswego. May to July. 



Carex VICARIA Bailey. 4. Rust colored .sedge. Wet places, 

 Oswego, south of Milwaukie and about Vancouver. May to July. 



Carex sterilis Willd. 4. Little prickly sedge. Fairly 

 common in moist ground near Oswego. May to July. 



Carex Deweyana Schwein. 4. Dewey's sedge. Conifer- 

 ous woods, Sauvie's ibland, Swan island, and near Linuton. May 

 to August. 



Carex Boi^anderi Olney. 4. Bolander's sedge. Moist 

 copses, Sauvie's island and near Linnton. May to Aug. 



Carex feta Bailey. 4. Western sedge. Swales and wet 

 ground, Oswego, Vancouver, etc. May to July. 



Carex festiva Bailey. 4. Dark rusty sedge. Moist grassy 

 places, Swan island, Ross island, etc. June, July. 



X Carex macrochaeta C. A. Meyer. 4. Long bristled 

 sedge. Infrequent on stream banks, Multnomah Falls westward 

 to Bridal Veil. June to August. 



ARACEAE Necker. Arum Family. 

 Lysichiton Schott. Skunk cabbage. 

 Lysichiton kamtschatcensis (L.) Schott. 4. Western 

 skunk cabbjge. Common in boggy ground, South Portland, 

 Fulton, Oak Grove, etc. February to April; yellow. 



LEMNACEAE Dumort. Duckweed Family. 



Lemna L. Duckweed. 



Lemna trisulca L. 4. Ivy leaved duckweed. Common in 



ponds. East Portland, Oswego,Oak Grove, etc. June to Aug.;grceu. 



Spirodela Schleid. Greater duckweed. 



Spirodela polyrhiza (L.) Schleid. 4. Greater duckweed. 



