J/iliiicock — 77/r Crosses of JlWiVaii 107 



KEYS. 



KEY TO THE TRIBES. 



Subfamily Poatae. Spikelets i to niany-t1o\vcrc(I, ilic reduced llciret^, if any, above tbe perfect 

 florets (except in Plialarideae) : articulatidii nsiiall\' alK)ve tiie hUdiics: spikelets usually 

 more or less laterally compressed. 



Plants woody, the culms perennial: spikelets several-Howered BAMBOSEAE. 



Plants herbaceous, the culms annual. 



Spikelets with 2 staminate, neuter, or rudimentary lennnas unlike and below the fertile 



lemma: no sterile or rudimentary florets above PHALARIDEAE. 



Spikelets without sterile lemmas below the perfect floret. 

 Spikelets sessile on a usually continuous rachis. 



Spikelets on ojiposite sides of the rachis: spike terminal, sintjlc HORDEAE. 



.Spikelets on one side of the rachis: spikes usually more than i. diL;ilali' or 



racemose CHLORIDE AE. 



Spikelets pedicellate in open or contracted, sometimes spikelike, ]5anicles. 



Spikelets i-flowered AGROSTIDEAE. 



Spikelets 2- to many-flowered. 



Glumes as long as the lowest floret, usually as long as the spikelet : lemmas 

 awned from the back (spikelets sometimes awnless in Trisetum ) 

 AVENEAE. 



Glumes shorter than the first floret: lemmas awnless or awned from the 



tip or from a bifid apex FESTUCEAE. 



Subfamily Panicatac. Spikelets with one perfect terminal floret (disregarding those of the few 

 monoecious genera and the staminate and neuter spikelets ) and a sterile or staminate 

 floret below (perfect in Isachne and Dissochondrus ), commonly represented by a sterile 

 lemma only, one glume sometimes wanting; articulation below the spikelets, either in 

 the pedicel, in the rachis, or at the base of a cluster of spikelets, the spikelets falling 

 entire, singly, in groups, or together with joints of the rachis ; spikelets, or at least the 

 fruits, more or less dorsally compressed. 

 Glumes membranaceous, the sterile lemma like, the glumes in texture : fertile lemma and 



palea indurate or at least firmer than the glumes PANICEAE. 



Glumes indurate : fertile lemma and palea hyaline or membranaceous, the sterile lemma like 

 the fertile one in texture. 

 Spikelets unisexual, the pistillate below, the staminate above, on the same inflorescence; 



the pistillate (in our species) enclosed in a bony ovoid involucre or head 



TRIPSACEAE. 



Spikelets in pairs, one sessile and perfect, the other pedicellate and usuallv staminate 

 or neuter (perfect in Ischaennim) ANDROPOGONEAE. 



KEY TO THE C.KNERA. 



BAMBOSEAE. 



A single genus in the Hawaiian Islanils 1. Sciiizo.sT.xciivu.M (p. iioj 



FESTUCEAE. 



Lemmas 3-nerved 7. Er.\grostis (p. 123) 



Lemmas 5 to many-nerved. 



Lemmas as broad as long, the margins outspread : florets closely imbricate, horizontall) 

 spreading 6. Briz.v (p. 123) 



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