GRASSES OF IOWA. 



97 



ZIZANIA AQUATICA. 



Zizania aquatica L. Sp. PI. 991, 1753. Watson and Coulter. Gray. 

 Man. Bot. 635.pl. 7. 1890. (6th ed.) Scribner. Grasses of Tenn. Bull. Univ. 

 Tenn. Agr. Exp. Sta. 7: 58. 1894. Bull. U. S. Dept. Agr. Div. Agros. 

 17: 113. /. 409, 1899. Nash in Britton and Brown 111. PI. 1: 128. /. 286. 

 1896. Beal. Grasses of N. A 2: 173. /. 34. 1896. Vasey Contr. U. S. Nat. 

 Herb. 3. 41. 



^VS 



DESCRIPTION. 



Wild Rice. A stout, 

 erect, aquatic annual, 5 to 17 

 feet (9-30 dm.) high. 

 with broad, flat leaves and 

 large panicles, 10 to 20 inches 

 (30-60 cm.) long. Stami- 

 nate spikelets 3 to o lines (6- 

 12 mm.) long, awnless; the 

 pistillate spikelets 4 to 12 

 ^T lines (8-24 mm.) long, the 

 outer one bearing an awn 

 12 to 24 lines (24-48 mm.) 

 long. Grain linear 5 to 8 

 lines (10-iu mm.) long. 

 Swamps and shallow mar- 

 gins of sluggish streams and 

 rivers. June to October. 



Wild rice is most frequent 

 in northern Iowa in the lake 

 region. Common also along 

 the Mississippi and northern 

 Missouri in Iowa. Though 

 once common in the vicinity 



F10. 89. Zizania aqualica.— a, pistillate spike- of Ames, it has riOW disap- 

 let ; b, palea and flower ; c, staminate spikelet. , 



(Div. Agros. U. S Dept. Agrl. ) peared. 



DISTRIBUTION. 



Iowa. 3039 Steamboat Rock, 3139 Lansing (Miss King) ; Ames 

 (beyond Hammond's Mill): 1294 Jewell Junction (Pammel); Cedar 



