March 1, 1930] Revision of the Flora of the Bombay Presidency 



20 



(b) All the spikelets or only the upper of 



each branch supported by bristle-like 



branches (vol. 33, 19) 



(2) Group Meliniastrce.— Spikelets finely awn- 



ed or mucronate from the notched tips of 



the upper involucral glume and barren 



floral glumes (or if muticous, these at 



least slightly notched) delicately pedi- 



celled, panicled ; lower involucral glume 



very minute. Upper involucral glume 



and barren floral glume gibbous at or 



below the middle, both 5-nerved ; nerves 



hidden by copious and long silky hairs 



and anastomosing below the obtuse tips 



(vol. 33, 21) 



b. Spikelets falling in groups or if 



singly, then surrounded by an 



involucral of bristles or at least 



supported by 1 to several bristles. 



Group Cenchastrce .— Spikelets falling by an 



involucral of bristles or spines or bract-like 



scales, or at least supported by 1 to several 



bristles ; or with the lower involucral glumes 



of each group forming a false involucre 



(1) Involucre of free naked or plumose bristles 



(vol. 33,22) 



(2) Involucres of spines or rigid bristles united 



at the base into a hard cup (vol. 33, 

 229) 

 2. Sub-tribe: Isachnincs. — Both florets fertile, 

 or if the lower male, then its floral glume 

 more or less resembling that of the upper 

 floret and indurated. 

 Group Isachnastrce . — Florets very similar, 

 spikelets more or less panicled (vol. 33, 230). 

 SUB-FAMILY II : Pooideae.— Mature spikelets breaking up, 

 leaving the persistent or subpersistent glumes on 

 the pedicel, or if falling entire, then not consisting 

 of 2 heteromorphous florets as in Panicoideae 

 (Genera 62-109). 

 1. Blades not articulated on the sheath, rarely 

 (Centotheca) transversely veined (Genera 

 62-104) 

 A. Awn of the fertile floret, if present, kneed 

 and twisted below the knee, or straight 

 in reduced forms (Genera 62-78). 

 i. Florets 2 or more (Genera 62-69) . 

 TRIBE IV : Arundinelle^e.— Florets 2, hetero- 

 morphous, the lower awnless, or barren. Rhachilla 

 not continued beyond the upper floret. Lower floral 

 glume awnless, rather resembling the involucral 

 glumes ; upper generally awned, at length firm or 

 hard : awn from sinus between 2, sometimes minute 

 or bristle-like, lobes, rarely from the entire obtuse 

 tip, usually kneed and twisted below the knee. 



a. Upper floral glume 2-setose, minutely 



2-toothed or entire ; awn sometimes 

 reduced (vol. 33, 230) ... 



b. Upper floral glume always distinctly 



2-toothed or 2-lobed ; awn always 

 kneed ; spikelets in clusters of 3 (vol. 

 33, 234) 

 TRIBE V : A vbne^e.— Florets 2-many, all alike, ex- 

 cept the uppermost which often are reduced. 

 Floral glumes with hyaline shining margins or 



57. Setaria. 



58. Trickolaena. 



59. 



60. 



Pennisetum. 

 Cenchrus. 



61 . Isachne. 



62. Arundinella. 



63 Tristachya. 



m 



