82 Karl M. Wiegand and Arthur J. Eames 



[P. CANARIENSIS L. CANARY GRASS. 



" Appears nearly every year on the campus and in waste places near Ithaca. Not 

 established" (D.) ; may be found in garbage dumps, springing from waste birdseed 

 but not persisting. 



Native of Eu.] 



1. P. arundinacea L. Reed Canary Grass. 



Meadows, ditches, and other marshy habitats ; frequent. June-July 10. 



Spencer Lake and Summit Marsh ; Fall Creek ; Inlet Marshes ; Utt Point ; Spring 

 Lake ; Salt Pond w. of Howland Island ; Lake Como ; and elsewhere. 



Newf . to B. C, southw. to N. J. and Colo. ; less frequent on the Atlantic Coastal 

 Plain. Found also in Eurasia. 



la. P. arundinacea L., var. picta L. Ribbon Grass. 



In damp dooryards, along roadsides, and on stream banks ; occasional. 



Escaped from cultivation: cove in Summit Marsh; "near steamboat landing" (D.) ; 

 clay bank, athletic field, C. U. campus; e. of Varna, by the railroad (£>.!); near 

 Dryden Lake (D.) ; near Red Mill Pond (D.) ; Spring Lake; and elsewhere. 



Native of Eurasia. 



Tribe 7. Oryseae 

 37. Leersia Sw. 



a. Spikelets 2.5-3 mm. long ; foliage smooth or nearly so ; rootstocks short, thick, and 

 very scaly. 1. L. virginica 



a. Spikelets 4-5 mm. long ; foliage very rough, retrorse-prickly ; rootstocks slender 

 and inconspicuously scaly. 2. L. oryzoides 



1. L. virginica Willd. White Grass. 



Rich damp shady sandy or gravelly soils, with no apparent relation to lime content ; 

 frequent. July 15-Aug. 



Negundo Woods (D.\) ; near Indian Spring (D.) ; Renwick woods; Beebe Lake, 

 s. side; Freeville (D.) ; ravine n. of Sheldrake; Big Gully; and elsewhere. 



Me. to Ont, southw. to Fla. and Tex., including the Coastal Plain. 



2. L. oryzoides (L.) Sw. Cut-grass. 



Marshes, in alluvial and mucky soil with no apparent relation to lime content ; 

 common. Aug. 



Lower Inlet Valley and Cayuga Lake marshes ; Fall Creek, above Forest Home ; 

 Ringwood ; Etna ; McLean Bogs ; and elsewhere. 



Newf. to Oreg., southw. to Fla. and Tex. ; common on the Atlantic Coastal Plain. 



Tribe 8. Zizanieae 

 38. Zizania (Gronov.) L. 



a. Pistillate flowering glumes thin and papery, dull, finely striate, scabrous over the 

 whole surface ; aborted spikelets slender and shriveled, less than 1 mm. thick ; 

 branches of the pistillate inflorescence 6-15 cm. long (exclusive of the spikelets), 

 often spreading; leaves 10-50 mm. wide. 1. Z. aquatica 



a. Pistillate flowering glumes firm and tough, with lustrous, closely corrugated sur- 

 face, scabrous on the margins, at the summit, and sometimes along the nerves, 

 otherwise glabrous ; aborted spikelets 1.5-2 mm. thick ; branches of the pistillate 

 inflorescence 1.5-4.5 cm. long, appressed ; leaves 4-10 mm. wide. 2. Z. palustris 



