17 Jour., Bom. Nat. Hist. Soc., Vol. XXXIV, No. 1 [March 1, 1930, 



b. Margins of the lower involttcral glume 

 of the fertile spikelets involute, inflex- 

 ed and 2-keeled (if at all) only close 

 to the tips, the spikelets, therefore, 

 with rounded sides or quite terete ; 

 callus elongate and acute or pungent ; 

 awn more or less hirsute, from the 

 stipitiform floral glume (Genera 38- 

 41). 



(1) Group Heteropogonastrce. — Race- 



mes many-noded, solitary ; all 

 pairs of spikelets heterogamous and 

 alike or the lowest 1-many homo- 

 gamous and barren, very different 

 from the fertile, not forming an 

 involucre around them (vol. 32, 622) 



(2) Group Theniedastrce . — Racemes 



fasciculiform, solitary at the apex of 

 the stem and branches. Spikelets 

 dimorphic, the 4 lower sessile form- 

 ing an involucre round the upper, 

 i. Rhachis articulate below the in vol u- 



cral spikelets (vol. 32, 626) 

 ii. Rhachis articulate above the involu- 

 cral spikelets (vol. 32, 627) 



(3) Group Pseudothemedastrce . — Like 



ThemedastrcB above but without the 

 involucrant spikelets of that group 

 (vol. 32, 631) 

 TRIBE 111 : Panice^;.— Spikelets in usually con- 

 tinuous spikes, racemes or panicles Involucral 

 glumes herbaceous or membranous, the lower 

 generally smaller, very small or suppressed. 

 Lower floral glume generally resembling the 

 involucral glumes in structure and nervation, the. 

 upper fertile firmer, at length rigid, often 

 chartaceous or crustaceous, awnless, very rarely 

 mucronate {Urochloa) (Genera 42-61). 

 1. Sub-tribe : Panicincs.— Upper floret only 

 fertile ; lower floral glume usually resemb- 

 ling the upper involucral glume, not 

 indurated (Genera 42-60). 



A. Undershrubs ; flowers dioecious. 



Group Spinificastrace .'—Male spikelets 2- 

 flowered, articulate in rigid umbellate 

 spikes ; female in large globose heads of 

 stellately spreading quill -like rhachis, 

 one spikelet at the base of each (vol. 

 33,21) 



B. Herbs ; flowers not dioecious (Genera 43- 



60). 



i. Group Digitariastrcz .-—Inflorescence of 



usually slender, spiciform, digitate or 



subdigitate or somewhat distant, very 



rarely solitary racemes ; fruiting floral 



glume with usually flat, thin to hyaline 



margins, thinly cartilaginous, often 



brown or dark, with the usually 



minute, often microscopic, scale-like 



pale of the barren floret attached to 



the base. 



a. Spikelets awnless ; lower involucral 



glume minute, rarely ; lower floral 



glume usually with 5-7 close, straight, 



prominent nerves (vol. 32, 632) 



38. Heteropogon. 



39. heilema. 



40. Themeda. 



4 1 . Pseudanthiria . 



42. Spiniftx. 



43. Digitaria. 



[61 



