206 BULLETIN 772, TJ. S. DEPARTMENT OF AGRICULTURE. 



Endodia Raf., Neogenyt. 4. 1825. Based on Leersia lenticiilaris, the only 

 species mentioned. 



Aplexla Raf., Bull. Bot. Seringe 1: 220. 1830. A single species, Leersia 

 virgata (probably a misprint for L. virginica) is included. 



All the species of the United States except H omalocenchrus monan- 

 drus (Swartz) Kuntze, a plant of rich woods in southern Florida and 

 southern Texas, have creeping rhizomes. Most of them are marsh 

 grasses. H omalocenchrus monandrus differs from the other species 

 also in having small glabrous spikelets in which the palea is rounded 

 on the back and lacks the midnerve, as in rice. In the other species 

 the palea is strongly compressed-keeled and appears to represent a 

 bract rather than a prophyllum. 



H omalocenchrus virginicus (Willd.) Britton and H. oryzoides 

 (L.) Poll. (fig. 123) are common throughout the eastern United 

 States in moist soil, the latter often forming distinct zones of vege- 

 tation in marshes. The first has spikelets about 3 mm. long and the 

 main panicle branches solitary ; the second has spikelets about 5 mm. 

 long and the lower main panicle branches more than one at the node. 

 These species, because of the very scabrous, adhesive blades, are 

 called rice cut-grass. The species have no economic importance. 



10. ZIZANIEAE, THE INDIAN-RICE TRIBE. 



104. ZIZANIOPSIS Doell and Aschers. 



Spikelets unisexual, 1-flowered, disarticulating from the pedicel, 

 mixed on the same branches of the panicle, the staminate below; 

 first glume wanting;, second glume 7-nerved, short-awned in the 

 pistillate spikelets; lemma 3-nerved; palea wanting; stamens six; 

 styles rather long, united; caryopsis obovate, free, coriaceous, 

 smooth and shining, beaked with the persistent style. 



Robust perennial marsh grasses, with stout creeping rhizomes, 

 broad flat blades, and large open panicles. Species three; two in 

 South America, one in the United States. 



Type species: Zizania microstacJiya Nees. 



Zizaniopsis Doell and Aschers.; Doell in Mart. Fl. Bras. 2 2 : 12, pi. 3. 1871. 

 A single species described. 



The only species in the United States is Zizaniopsis miliacea 

 (Michx.) Doell and Aschers. (fig. 124), growing in swamps from Vir- 

 ginia to Florida and Texas. Like Zizania palustris, which it some- 

 what resembles, this species may be gregarious over wide areas. It 

 has no economic importance except as it may furnish shelter and food 



to water birds. 



105. ZIZANIA L. 



Spikelets unisexual, 1-flowered, disarticulating from the pedicel; 

 staminate spikelet soft, the first glume wanting, the second 5-nerved, 

 membranaceous, linear, acuminate or awn-pointed; lemma about as 

 long as the glume, 3-nerved; palea wanting; stamens 6; pistillate 



