MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



542 



ZlZANIA AQUATICA Var. ANGUSTIFOLIA HitcllC, 



rice. Culms usually not more than 

 1.5 m tall; blades usually not more 

 than 1 cm wide. O —Shallow 

 water, Quebec and New Brunswick 

 to North Dakota, south to New 

 York and Nebraska. 



2. ZizaniatexanaHitchc. Texas 

 wildrice. (Fig. 1143.) Perennial; 

 culms long-decumbent and rooting 

 at base, 1 to 3 m long; blades elon- 

 gate, 3 to 15 or even 20 mm wide; 

 panicle 20 to 30 cm long, narrow, 

 the lower (staminate) branches 

 ascending, 5 to 10 cm long; stami- 

 nate spikelets 7 to 8 mm long, 1.5 



Northern wild- 



Figurk 1142.— Distribution of 



Zizania aquatica. 



mm wide ; pistillate spikelets about 

 1 cm long, tapering into an awn 1 

 to 2 cm long. 01 -Growing in 

 rapidly flowing water, San Marcos, 

 Tex. The grass grows in water 30 

 to 120 cm deep, the lower part of 

 the plant prostrate or floating on 

 the water, the upper part erect. 

 Flowers from April to November 

 and at warm periods during winter. 

 Said to be troublesome in irrigation 

 ditches. 



114. ZIZANlOPSIS Doell and 

 Aschers. 



Spikelets unisexual, 1 -flowered, 

 disarticulating from the pedicel, 

 mixed on the same branches of 

 the panicle, the staminate below; 

 glumes wanting; lemma 7-neryed, 

 short-awned in the pistillate spike- 



Figuke Ml.-Zizania texana. Plant, X V 2 ; pistillate and staminate spikelets, X 5. (Type.) 



lets- palea 3-nerved; staminate spikelets with 6 stamens; styles 

 rather long, united; fruit obovate, free from the lemma and palea, 



