ORYZE^. 173 



Culms 30 cm. high, branching from a creeping rhizoma. Leaf- 

 blades flat, smooth. Base of panicle scarcely above the sheath. 

 Spikelets lanceolate, generally equal in length to the pedicels. 

 Outer glume of staminate spikelet 7-nerved, 6 mm. long; inner 

 glume 9-nerved, emarginate ; glumes nearly equal ; pistillate spike- 

 lets 50-80. Panicles about the size of the former species, glumes 

 much alike, 7-nerved, and half as long as those of the staminate 

 spikelets. 



Florida, Mexico, to Brazil, 



38. (40). ZiZANiA L. Sp. PI. 991 (1753). Wild Rice. In- 

 dian EiCE. Water-oats. Hydropylum Link, Hort. Berol. 1 : 252 

 (1827). Melinum Link, Handb. 1: 96 (1829). 



Spikelets narrow, monoecious, 1-flowered, sessile or with short 

 pedicels on the jointed branches of the jointed panicle. Glumes 2, 

 surrounded at the base by a more or less prominent cartilaginous 

 ring, slightly unequal, membranous, convolute, concave or slightly 

 compressed, the outer broader, acute, or in the pistillate spikelet 

 awned and empty, the inner floral glume scarcely shorter, and awn- 

 less; palea 0. Stamens 6. Styles more or less joined at the base, stig- 

 matic hairs simply plumose. Grain included by the membranous 

 glumes, but not adherent. A large aquatic grass with long flat in- 

 equilateral leaf-blades. Panicle terminal, ample, loosely flowering,, 

 having numerous long slender rays. 



One well known species found in North America. An impos- 

 ing plant with a subtropical aspect. 



1. Z. aquatica L. Sp. PI. 991 (1753). Wild Rice. 



Melinum iKilustre Link, 1. c. Z. palustris L. Mant. 2:295 

 (1771). Z. clavulosa Michx. Fl. Bor. Am. 1:75 (1803). Hydro- 

 pyrum esculentum Link, Hort. Berol. 1:252 (1827). 



Z. latifoHa Griseb. Turcz. Bull. Soc. Nat. Mosc. 105 (1838). 



Annual; 1-4 m. high, culm hollow with numerous delicate trans- 

 verse partitions within the internodes. Ligule acute, 1 cm. long; 

 lower blades 0.4-1 metre long, with winged petioles, upper broad at 

 the base. Lower part of the pyramidal panicle staminate, spreading; 

 the upper part pistillate, erect; pedicels slender, clavate, outer 



