PART II 



KEYS OF ANALYSIS AND DESCRIPTIONS OF TRIBES AND 



GENERA. 



Note. — The numbers in parenthesis preceding the names of the 

 genera refer to the corresponding genus numbers in Bentham & Hooker, 

 Genera Plantarum. 



KEY TO THE TRIBES. 



A. Spikelets one-, rarely two-flowered, lower flower when 

 present imperfect; falling from the pedicel entire or to- 

 gether with certain joints of the rachis at maturity. 

 Rachilla not produced beyond the flowers. Internodes 

 between the different glumes or flowers not measurable. 

 a. Hilum punctiform. Spikelets not flattened later- 

 ally, but usually somewhat dorsally compressed 

 or else perfectly round. 



a. Flowering glumes and palea (the latter often 

 wanting) hyaline. Empty glumes thick mem- 

 branaceous to coriaceous or cartilaginous, the 

 lowest the largest, with its edges embracing the 

 others. Spikelets generally in racemes or spikes 

 whose articulate axes break up at maturity. 

 I. 8 and $ spikelets in separate inflorescences 

 or on different parts of the same inflores- 

 cence I. Maydese. 



II. Spikelets either all £ , or $ and £ , and so 



arranged in the same inflorescence that a $ 



stands near a § . . . II. Andropogonese. 



ft. Flowering glume and palea membranaceous ; 



empty glumes herbaceous, chartaceous or 



coriaceous, the first generally the largest ; 



spikelets falling off singly or in groups from 



the continuous rachis III. Zoysiese. 



34 



