ANDROPOGONEiB. 



25 



length, linear-lanceolate, 4 mm. long, the twisted awn protruding 

 aboAt -4 mm. Cultivated, from Japan. 



Var. VARiEGATA. Leaf-blades striped. Var. zebrina. Leaf- 

 blades contain transverse bands of brown and light color. Culti- 

 vated for ornament; not hardy, in the northern U. S. 



7. (75). Saccharum L. Gen. PI. Ed. 1, No. 4iJ (1735). 



Spikelets awnless in pairs, one sessile, the other pedicellate, on 

 the jointed branches of a panicle, each containing perfect flowers or 

 the pedicellate one containing a pistillate flower. The three empty 

 glumes acute or acuminate, hyaline, or membranous, first and 

 second equal, third smaller, floral glume unawned. Stamens 3. 

 Styles distinct. Grain oblong enclosed, but not adherent. 



\ 



Fig. 7. — Saccharum officinarum. Spikelet, x 7. (Richardson.) 



Tall perennials with flat or convolute leaf-blades. Panicle termi- 

 nal, variable, spreading or spikelike. Spikelets more or less villous. 



Species about 12 which are tropical or subtropical, 1 of which 

 is extensively cultivated. 



1. S. Officinarum L. Sp. PL Ed. 2, 1 : 79 (1762). Sugar- 

 cane. 



Culms solid, 2-4 m. high, 2-5 cm. diam. Leaf -blades long, 

 2-4 cm. or more wide. Panicle pyramidal, 40-80 cm. long. Silky 

 hairs twice as long as the spikelets. Spikelets linear, 2.2-2.5 mm. 

 lonsr. 



