38 GRAMINACEAE (GRASS FAMILY) 



PANICEAE (Millet Tribe). — Spikelets in spikes or racemes or panicles, 

 falling off singly from the ultimate branches ; fertile spikelet with i terminal 

 pistillate flower, with or without a staminate one below it. Glumes rarely 

 awned, the awn straight. Lemma and palet firmer than the glumes, un- 

 awned in most. Stamens 3, rarely fewer. Grain inclosed, free, unfurrowed. 



A. Spikelets in i-sided spikes or spikelike racemes. 

 B. Lemmas not awned; glumes not spiny-hispid, lience spikes or spikelike racemes 

 not bristly. 

 C. Annual; lower glume very small; lemma with hyaline margin, not inroUed. 

 W. E. — A bad weed in cultivated fields. (Gk. syn = with, therismos = crop; 

 hence crop-making.) Syntherisma sanguinale (crab grass) 



CC. Perennial; glumes equal or nearly so; lemmas without hyaline margin, in- 

 rolled. E. — (Gk. paspalos = millet.) Paspalum dlstichum (joint grass) 

 BB. Sterile lemma awned; glumes spiny-hispid, making the spikelike racemes 

 somewhat bristly. W. E. — (Gk. echinos = a hedgehog, cMoa = grass; referring 

 to the bristling awns.) Echlnochloa crusgalli (barnyard grass) 

 AA. Spikelets in open panicles, or if in a spikelike panicle this not i-sided. 

 D^ Spikelets without an involucre of bristles, in an open panicle. — ^,(Latin name of 

 the Italian Millet.) Panicum (panic grass) 

 DD. Spikelets with an involucre of bristles, clustered in a single dense terminal 

 spikelike panicle. W. E. — (Gk. chaeta = a bristle, chtoa = grass; referring to 

 the bristly spikes,) Chaetochloa viridls (green foxtail) 



ORYZEAE (Rice Tribe). — Perennial. Spikelets laterally flat, in a loose 

 panicle, with i terminal unisexual or perfect flower inclosed by a lemma and 

 a palet ; lemma boat-shaped, awnless, clasping the palet by a pair of strong 

 marginal veins, palet i-veined. Glumes none. Stamens 3. Grain fur- 

 rowed. — Oryza saliva, cultivated rice, is in this tribe. Only the follow- 

 ing species. W. E. — (Gk. omalos = resemblance, kenchros = millet ; hence 

 millet-like.) Homalocenchrus oryzoides (eice cut-grass) 



PHALAREAE (Canary-grass Tribe). — Leaf blades flat. Spikelets of 

 I perfect flower with 2 sterile or staminate lemmas below it and falling 

 attached to it. Palet 0-2-veined, inclosed in fertile lemma. Stamens 2-3. 

 Stigmas plumose. Grain unfurrowed, inclosed, free. 



A. Spikelets in spikelike or headlike clusters. 



B. Glumes equal; sterile lemmas awnless; stamens 3; plant not sweet-scented. 

 — (Gk. phalaros = brilliant; referring to the shining seed.) 



Phalarls (canary grass) 



BB. Glumes unequal, lower about J the upper; sterile lemmas awned; stamens 2; 



plant markedly sweet-scented. W. — (Gk. anthos = a flower, xanlhas = yellow.) 



Anthoxanthlum odoiatum (sweet vernal grass) 



AA. Spikelets in loose panicles. 



C. Plant not sweet-scented; spikelets i-flowered; sterile lemmas subulate. (See B.) 

 CC. Plants strongly sweet-scented; spiklets 3-flowered, the lower 2 flowers stami- 

 nate; staminate lemmas boat-shaped. — (Gk. hieros = holy, chloe = grass; in 

 Europe strewn before church doors on saints' days.) Hlerochloe (holy grass) 



AGROSTEAE (Timothy Tribe). — Spikelets with i perfect flower. 

 Rachilla sometimes prolonged beyond the palets into a naked or plumose 



