vi INTRODUCTION. 



Festucese, we now try to determine its genus by the key 

 which follows. The flowering glumes are not " divided 

 into three-to-many awn-like lobes," so we pass from "A" 

 to " B " on the next page, where it says " Flowering 

 glumes entire or two-toothed," etc. As those of Orchard- 

 grass are entire, we continue with the next division of 

 the key, " a. Rachilla or flowering glumes with long 

 hairs which envelop the latter." There are no such 

 hairs in our specimen, so we pass at once to " b. Rachilla 

 and flowering glume naked or hairy, hairs much shorter 

 than the glumes." These characters apply to our plant, 

 and as it has plumose stigmas projecting from the sides 

 of the flowering glumes, we pass from " a" directly to 

 "/?," the division having stigmas of this character. 



In order to avoid repetition, we will simply quote 

 from the succeeding divisions of the key that which it is 

 necessary to read to complete the determination, placing 

 in italics the characters excluding from any one of them 

 the grass we are analyzing. All reference to the sub- 

 divisions under these last are of course omitted. 

 "I. Spikelets of two forms," etc. 

 "II. Spikelets all alike." 



" 1°. Flowering glumes three-toothed," etc. 

 " 2°. Flowering glumes of some other structure." 

 " * Flowering glumes one to three-nevxed" 

 etc. 

 " -* Flowering glumes 3-5- to many-nerved, 

 with tivo or more of the upper glumes 

 empty," etc. 

 " *** Flowering glumes five- to many-nerved ; 

 each containing a £ flower or the upper 

 with only a $ flower, or empty." (Ex- 

 ceptions noted.) 

 " t Leaves broad, lanceolate or ovate, with 

 fine transverse veins between the longi- 

 tudinal nerves." 

 " ft Leaves linear or lanceolate, no distinct 

 transverse veins." 

 " O Keel of palea winged," etc. 

 "OO Keel of palea not appendaged." 



