264 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
DESCRIPTIVE LIST, WITH KEYS. 
KEY TO THE TRIBES, 
Series 1. PANICATAE. 
Spikelets with 1 perfect terminal floret (disregarding the few monccious 
genera and the staminate and neuter spikelets) and a sterile or staminate 
floret below, usually represented by a sterile lemma only, one glume sometimes, 
rarely both glumes, 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, either singly, in groups, or together with joints of the rachis; 
spikelets, or at least the fruits, more or less dorsally compressed (laterally in 
Lithachne). 
Glumes indurate; fertile lemma and palea hyaline or membranaceous, the 
sterile lemma like the fertile one in texture, 
Inflorescence moncecious, the pistillate spikelets below, the staminate above 
on the same rachis__--i-e- 1. TRIPSACEAE (p. 265). 
Inflorescence not monecious, the fertile spikelets perfect, each usually 
paired with a sterile spikelet. 
Spikelets in pairs, one sessile, the other pedicellate (the pedicellate 
sometimes obsolete) ; lemmas hyaline. 
2. ANDROPOGONEAE (p. 265). 
Spikelets all alike, solitary or in groups of 2 or 3; lemmas mem- 
branaceous____--__- ee 3. NAZIEAE (p. 266). 
Glumes membranaceous; fertile leimiua und palea indurate or at least as firm 
as the glumes; sterile lemma like the glumes in texture. 
Fertile lemma and palea scarcely firmer than the glumes. 
4, MELINIDEAE (p. 266). 
Fertile lemma and palea indurate or subindurate, usually much firmer 
than the glumes_____-__--_____ 5. PANICEAE (p. 267). 
Series 2. POATAR. 
Spikelets 1 to many-flowered, the reduced florets, if any, above the perfect 
florets (except in Phalarideae; sterile lemmas below as well as above in 
Uniola) ; articulation usually above the glumes. 
Plants woody, usually arborescent, clambering, or climbing (scarcely woody 
in Planotia_w-wwee ee 13. BAMBOSEAE (p. 272). 
Plants herbaceous. 
Spikelets with 2 sterile or rudimentary lemmas unlike and below the 
fertile lemma —_-__--~_-__- 7. PHALARIDEAE (p. 269). 
Spikelets without sterile lemmas below the perfect floret (or these rarely 
present but like the fertile ones). 
Spikelets articulate below the glumes, 1-flowered, either much com- 
pressed or if not then unisexual, never in dense spikes; glumes 
often reduced, sometimes wanting________ 6. ORYZEAE (p. 269). 
Spikelets articulate above the glumes or, if below, spikelets 2 or more 
flowered (Notholeus and Sphenopholis) or in dense racemose 
spikes (Spartina). 
Spikelets sessile on a continuous rachis, forming spikes (short- 
pedicellate in Leptochloa and Gouinia). 
Spikelets on opposite sides of the rachis; spike terminal, 
single____ - . __-12. HORDEAE (p. 272). 
