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273, line 5; for light yellow read whitish 



274, line 6 in the key to Alismaceae, after base insert: or leaves linear-lanceolate; 

 282, line 5 from bottom; delete Peoria Co.: Schoenbeck. 



309, line 10; for Nu.t. read Honck. 



323, line 2 from bottom; after spikelets several-flowered add: (except Hordenm and 

 some Chlorideae ) . 



328, line 10; for 4. Glumes 3. read 4. Glumes apparently 3. 



337, line 8; delete Marshall Co. 



338, line 13; after spontaneous, insert: native of Eurasia. 



