MACLOSKIE: GRAMINE^. 155 



(d] Stamens i-many; mostly 3 (the outer series of a double group, i 

 being anterior and 2 postero-lateral). 



(e) The ovary, i-ovuled with inferior external embryo ventrad of the large 

 floury endosperm ; 2 stigmas, right and left ; ripening to a grain (cary- 

 opsis). 



The term "flower" is used to include one set of the palets and the 

 parts which they enclose. 



(3) Above the flowers in a spikelet and occasionally below them may 

 be i or more rudimentary flowers with palets and inner organs variously 

 reduced. 



(4) In a few genera the whole spikelet is i -sexual, and the whole plant 

 may be dioecious. 



Species about 3,500, growing in all lands ; the most useful of the plant- 

 families. [Note (i) the foliage, including the leaf-sheaths, ligules and 

 glabrescence or pubescence ; (2) the inflorescence ; (3) the parts of a 

 spikelet, and the number of its normal and rudimentary flowers. When 

 not otherwise stated in our descriptions the stamens may be assumed to 

 be 3, and the styles 2 with feathery stigmas.] 



KEY TO THE TRIBES AND GENERA. 



A. Spikelets I -flowered, witfiout prolongation of the axis : rarely with an imperfect lower flower. 



Not flattened laterally. No internode between flowers or glumes. (ANDROPOGONEJE.) 

 b. Spikelets awnless, on a jointed rachis, easily breaking; silky. i. Elionurus, p. 160. 

 b2. Spikelets in pairs on a jointed hairy, not thickened rachis. One of a pair perfect and ses- 

 sile, the other pediceled and male. Each i -flowered, with 4 glumes; the lowest 

 glume coriaceous, the uppermost (floral) usually awned. 2. Andropogon, p. 160. 

 3. As Andropogon, but spikelets both hermaphrodite. 



c. Spike-like panicle woolly. Palea nerveless. Awnless. 3. hnperata, p. 161. 



c2. Spike slender with jointed, excavated rachis. Rachilla awn-like : palea 2-nerved. 



56. Lepturus, p. 245. 

 64. Spikelets all hermaphrodite, mostly glabrous, separating individually from the pedicel. 



Glumes 3-4, the floral not awned, more or less coriaceous. (PANICKY:.) 

 c. Spikelets without sterile valves or bristles or spines. 

 d. Glumes 3 ; no callus in the spikelets. 



e. Racemed or spiked ; the spikes I -sided, in 2's or panicled. 



4. Paspalunt, p. 162. 



ez. Panicled. 5. Antlttznantia, p. 163. 



d2. Glumes 4 (or the lowest one obsolete) ; spikelets single, pediceled. Lowest 

 glume short ; third empty or male ; fourth floral. Panicle either lax or spike- 

 like. 6. Panicum, p. 163. 

 c2. Spikelets with involucres of persistent bristles or spines. 



