90 THE TRUE GRASSES. 



are not made from rice ; the first comes from Sorghum, 

 the second from Broussonetia or Bambusa. About forty 

 varieties are founded upon the color and size of the fruit 

 and the absence or presence of awns. 



87. (45) Leersia Swartz (Homalocenchrus Mieg, Ehr- 

 hartia Wigg., Blepharochloa Endl.). Distinguished from 

 Oryza only by the aborted (indicated by minute rudi- 

 ments) empty glumes, awnless flowering glume, three, 

 two, or one stamen (six only in L. hexandra), and the 

 relatively smaller fruit. 



Species five; swamp-grasses, one of which, L. oryzoides 

 Sw., is found in the north temperate zone of both the 

 Old World and New World ; another, L. hexandra, 

 throughout the entire tropical zone, and three in America 

 only. 



88. (46) Achlsena Griseb. Panicle widely expanded. 

 Spikelets large, linear-lanceolate, awned. First empty 

 glume aristiform ; flowering glume convolute. Stamen 

 one. Caryopsis linear, with a very small embryo. 



Species one (A. piptostachya Gr.), in Cuba. 



89. (56) Reynaudia Kunth. Spikelets long. Empty 

 glumes subequal, two-lobed at the apex ; flowering glume 

 short-awned below the point, slightly exceeding the 

 empty glumes. Lodicules two ; stamens two ; embryo 

 small. 



Species one (R.Jtliformis Kunth), in Cuba. Leaves 

 narrow ; branches of the panicle erect ; spikelets small. 



90. (43) Hygroryza Nees (PotamocMoa Griffith). Float- 

 ing, aquatic grasses with broad, short leaves ; the sheaths 

 of the lower ones much inflated. Panicles umbellate, 

 few-flowered. 



Species one (H. aristata Nees), in the East Indies. 



91. (30) Anomochloa Brongniart. An anomalous grass 

 with long-petiolate leaves ; the solitary apical spike with 

 many large, sheathing bracts. Flowering glume inem- 

 branaceous, palea harder, closed and tubular below with 

 a filiform appendage. A membranaceous fringed ring in 

 place of the lodicules. Stamens four. 



Species one (A. marantoidea Brongn.), in Brazil. 



92. (28) Lygeum L. The united, very hairy flowering 



