DESCRIPTIONS OF TRIBES AND GENERA. 



103 



grass with drooping leaves, the blades of which are re- 

 versed (see page 8). 



107. (112) Aciachne Benth. A dwarf grass with 

 closely two-ranked, short leaves and a single 9 spikelet 

 terminating the culm. Fruiting glume with a long sub- 

 ulate point. $ spikelets unknown. 



Species one (A. pidvinata i, in the Andes of the tropics. 



108. (113) Muhlenbergia Schreb. (Fig. 45). Panicles 



Fig. 4S.—Muhlenbergia dif- 

 fusa Schreb., above ; M. syl- 

 vatica Torr , below. (After 

 A. Gray, Man. pi. 8.) 



Fig. 45a.—Bealia Mexicana, Serib- 

 ner (provisional) ; C, Empty 

 glumes; C. 2., Dorsal view of ex- 

 panded empty glume; D and E. 

 Flowering glume and palea; Z>, 

 Dorsal vie w of flowering glume ; St , 

 stamen; J, Pistil; A', Fruit. (Orig- 

 inal.) 



contracted or diffuse ; spikelets small, aAvns often bent 

 or flexuose but rarely twisted. Very varying in habit. 



Species about sixty, mostly American, a few in Japan 

 and in the mountains of Asia. Vaseya Thurber, Podo- 

 scemum Desv., Tosagris Beau v., TrichocMoa Beau v., 



