172 



PANKACE.E. 



sile or pedicellate on the joiiitless branches of the jointed panicle. 

 Staminate s])ikelets witii 2 glumes that arc narrow, membranous, 

 awnless, tlie outer one broader and empty, the inner lloral one 

 narrower, but scarcely shorter; palea 0. Stamens (5-18. Pistil 

 rudimentary or 0. i'istillatc s})ikolets smaller than the stami- 

 nate, the outer glume broader and ap[)arently many-nerved. 

 Staminodia 0. Styles short, distinct, with simple ])lumoso stig- 

 matic hairs, (jlrain ovoid, loosely enclosed in the membranous 

 glumes. Seed plano-convex. Tree from the pericar]). Creeping or 

 floating grasses, low or tall, witii flat blades. Panicles terminal or 

 axillary, spreading, witli tilit'orm rays. 



Nearly allied to Zizania, but tlie spikelets are smaller, not awned, 

 the styles short, distinct, and there are usually more than six sta- 

 mens to the flower. 



Species six, all American. 



Fig. 33. — Luziola Alahamenais. A, stauiinate spikelet; B, pistillate spilie- 



let. (Richardson.) 



1. L. Alabamensis Chapm. Fl. S. States, 584 (18G0). 



Culms 5-15 cm. high, branching near the base, from a creeping 

 rhizoma. Leaf-blades flat, smooth, the upper partially included 

 by the purple sheath of the one below. Base of panicle often in- 

 cluded in the sheath. Spikelets ovate-lanceolate, shorter than tlieir 

 pedicels. Glumes of staminate spikelets lanceolate, 7-nerved: 

 those of the pistillate broader, 11-13-nerved, twice the lengJi of 

 the smooth mature grain. 



Alabama. 



2. L. Peruviana,!. F. Gmel. Syst. 637 (1778). 



