106 Chase — Notes on Genera of Panicese. TV. 



Fruit chartaceous-indurated the palea 

 enclosed (rarely the tip free). 

 Second glume not inflated-saccate. 

 Culms not woody nor bamboo like. 

 Fertile lemma neither with lateral 

 appendages nor excavations at 

 base, the inrolled margins 

 clasping the palea; inflores- 

 cence typically paniculate. 



17. Panicum. 



Fertile lemma either with lateral 



appendages or excavations at 



base, the margins usually not 



inrolled; first glume large; 



blades usually contracted into a 



petiole-like base . . 18. Ichnanthus. 



Culms usually woody, bamboo-like; 



spikelets globose, large, the 



glumes and sterile lemma papery; 



fruit bony-indurated, a downy 



tuft at the apex 10. Lasiacis. 



Second glume inflated-saccate, this and 

 the sterile lemma much exceeding 

 the stipitate fruit .... 20. Sacciolepis. 

 Fruit membranaceous, the palea not in- 

 closed above; spikelets lanceolate. 

 subsessile in usually spike-like pan- 

 icles 21. Ht/menachne. 



Glumes equal, enclosing the rest of thedor- 

 sally compressed spikelet; margins of 

 the fertile lemma Hat . . . 22. Homolepis. 

 Second glume and sterile lemma leathery- 

 indurated; spikelets stipitate . .'_'.'!. Scutachne. 

 Spikelets typically with two fertile florets. 

 Florets alike in form and texture; panicle 



compound 24. Jsachne. 



Florets unlike, the lower lanceolate, exceed- 

 ing the upper; panicle racemose. 



25. Heteranthoecia. 

 ^A Glumes or lemmas or both awned, or if short- 

 pointed only, the summit of fertile palea not 

 enclosed. 

 Inflorescence of unilateral racemes along a com- 

 mon axis, never digitate; glumes 2-lobed 

 (rarely entire) awned from between the 

 lobes; fruit indurated, the palea enclosed at 

 the summit 26. Oplismenus. 



