120 



(iKAMINKAH ((iUASS FAMILY) 



1. Z. paliistris L. (INDIAN RICE, WATER OATS.) Annual; culmfc 2-3 m. 

 high ; leaves flat, 5-10 dm. long, 1.5-4c in. wide. (Z. aquatica of auih. not L.) 

 v Swampy borders of streams and in shallow water ; common, 



especially northwestw. July, Aug. (Asia.) Fi<;. 7-'!. 



2. Z. aquatica L. Culms about 1 in. high ; leaves nar- 

 rower (less than 1 cm. wide) ; pistillate portion of panicle 

 more appressed. Me. to Minn., and northw. 



17. ZIZANI6PSIS Doll & Asch. 



Spikelets unisexual, the pistillate above, the stain inate below 

 on each branch- of the panicle, much alike in appearance, 

 laterally compressed ; glumes subequal, membranaceous, the 

 first glume of the pistillate spikelet with a short terminal awn, 

 the lemma acute, palea none ; glumes and lemma of staminate 

 spikelet acute, nerveless, palea none ; stamens <> ; grain ovoid, 

 with a chartaceous easily separable pericarp, loosely inclosed 

 in the glumes. A tall aquatic grass with long leaves and 

 long narrow terminal panicles. (Name from Zizania and 

 fli/as, appearance, from likeness to the preceding genus.) 

 1. Z. miliacea (Michx.) Doll & Asch. Perennial by a creeping rootstock ; 

 culms 1-4 m. high, geniculate at the lower nodes; leaves flat, 3-10 dm. long, 

 1-3 cm. wide. (Zizania Michx.) Swamps, Va., O., and south w. May. 



73. Z. aquatica x 1 

 cf spikelet. 

 9 spikelet. 

 Pistil with scales. 



18. LEERSIA Sw. CUT-GRASS. WHITE GRASS 



the open 

 fruitful 



panicles 

 glumes 



Spikelets 1-flowered, flattened laterally, perfect, but those in 

 usually sterile, those inclosed in the sheaths cleistogamous and 

 none, lemma boat-shaped, somewhat indurated, awnless, 

 clasping the palea by a pair of strong marginal nerves ; palea 

 of like texture, much narrower, 1-nerved ; stamens 1-6. 

 Perennials of moist ground, with rough leaves and short 

 racemes of imbricated spikelets arranged in open panicles. 

 (Named after Johann Daniel Leers, a German botanist of 

 the 18th century.) HOMALOCENCHRUS Mieg. 



* Spikelets narrowly oblong, rather loosely crowded. 



1. L. virginica Willd. (WHITE GRASS.) Culms weak, 

 branched, ascending, with clustered scaly rootstocks ; panicle 

 simple, the slender branches stiffly spread- 

 ing ; spikelets 2.5-3 mm. long, closely ap- 

 pressed ; lemma hispid on the keel ; stamens 

 2. Wet woods, Me. to Ont., and southw. 

 Aug. FIG. 74. 



2. L. oryzoides (L.) Sw. (RiCE CUT-GRASS.) Culms rather 

 stout, branched, ascending from a, decumbent l><>*<' f/f/i >/' H<I<T 

 creeping rootxfork* ; leaves vcr;/ rough; i><i>i!<-l< ///r// ></// 

 branched, lax ; x}>i/,:l,fs 4-5 mm. l<>u<i ; lemma hispid, strongly 

 bristly ciliate on the keel. Swamps or stream borders, ditches, 

 etc., Nfd. to Ont., and southw. Aug.. Sept. ( S. A.. Kurasia.) 

 FIG. 75. 



7"-. I.. <>rv/<>ide8. 

 Inflorescence x */ s . 

 A !>it i.f >:iin- x %. 



74. I., 

 A bit of inflorescence 



x :\. 

 Spikelet xr>. 



* * N/./'/WI in broadly oval, imbrieatety covering ""// 



3. L. lenticularis Michx. (CATCH-FLY (iitAss.) Culms 

 nearly simple, erect, or decumbent at base, with scaly n>ot- 



op,-n .-pik-u-t x'.'. stocks ; sheaths and blades sometimes nearly smooth ; panicle 

 nearly simple ; spikelets very flat, "> mm. long, strongly bristly- 



ciliate. Low grounds, Va. to Minn., and southw. 



