DESCRIPTIONS OF TRIBES AND GENERA. 



75 



a weed in gardens, but is cultivated in Bohemia upon 

 sandy soils, where the fruit is used for mush and por- 

 ridge; in the Southern United States, where it is known 

 as Crab-grass, it is valued for fodder. 



Sec. II. Trichachne (Nees as a genus, Acicarpa Raddi, 

 Urochloa Kunth, AUoteropsis Presl, Holosetum Steud., 



K 



Fig. 26. — Panicum sanguinale L. A x , 

 Part of a spike enlarged. A % 

 nat. size. (After Nees, Gen. Germ. 

 I. 18.) 



Fig. 27. — Panicum spectabile 

 Nees. A y% nat. size. (Af- 

 ter Mart, and Eichler, Fl. 

 bras. II. II. pi. 22.) 



Coridochloa Nees, Bluffia Nees). Racemes or panicles 

 simple, usually with long silky hairs. 



Sec. III. Thrcusya (Kunth as a genus, Tylothrasya 

 Doll.). Spikes with a broad axis, solitary. Flowering- 

 glume of the $ flower frequently two-cleft. 



Sec. IV. Echinolfena (Desv. as a genus). Spikes single, 

 divergent (Genus No. 17 of B. & H., Gen. PL III. p. 1107). 



Sec. V. BracJu'nria. Inflorescence as in Paspalum, 

 glumes awnless. 



