GRAM1NACEAE (GRASS FAMILY) 



49 PANICULARIA. 



i a Panicle open, loose; spikelets 5-i2-flowered 



RATTLESNAKE GRASS. (P. canadensis.) 

 b Panicle narrow, contracted; spikelets s-y-flowered 



BLUNT MANNA GRASS. (P. obtusa.) 



50 SAVASTANA HOLY GRASS. (S. odorata.) 



51 AGR6STIS. 



i a Branches of panicle smooth RED TOP. (A. alba.) 



b Branches of panicle rough; panicle loose 



ROUGH HAIR GRASS. (A. hy emails.) 



52 PANICUM. 



1 a Leaves usually more than % in. broad 2 



b Leaves Vi in. or less broad 5 



2 a Sheaths of leaves hairy throughout 3 



b Sheaths of leaves very sparingly hairy or hairy only 



at the nodes 4 



3 a Cultivated grain; leaf blade more or less covered with 



hairs EUROPEAN MILLET. (P. milaceum*) 



b Wild grass; leaf blade not usually hairy 



HISPID PANICUM. (P. clandestinum.) 



4 a Leaves ovate to broadly lanceolate; spikelets about Vs in. 



long WIDE-LEAVED PANICUM. (P. porterianum.) 



b Leaves linear to oblong; spikelets about ^6 in. long 



VARIABLE PANICUM. (P. commutatum.) 



5 a Leaves erect, conspicuously crowded at the base ; panicle 



not much higher than the leaves 



STARVED PANICUM. (P. de pauper atum.) 

 b Plants not completely as in a 6 



6 a A conspicuous ring of hairs at each node, usually point- 



ing downward 7 



b No ring of hairs as in a 8 



7 a Sheaths and blades of leaves conspicuously hairy 



ATLANTIC PANICUM. (P. atldnticum.) 

 b Sheaths and blades of leaves usually not hairy 



BARBED PANICUM. (P. barbulatum.) 



8 a Sheaths of leaves conspicuously hairy 9 



b Sheaths of leaves not hairy 12 



9 a Leaves 1-4 in. long 10 



b Leaves 4-12 in. long u 



10 a Spikelets hairy.RouND-FRUiTED PANICUM. (P. sphaerocdrpon.) 

 b Spikelets not hairy ...FORKED PANICUM. (P. dichotomum.) 



11 a Spikelets lanceolate; branches of panicle very fine, airy 



in appearance WITCH GRASS. (P. capillare.) 



b Spikelets ovate ; branches of panicle coarse, the panicle 



often drooping EUROPEAN MILLET. (P. milaceum*) 



12 a Flowering scales warty. WARTY PANICUM. (P. verrucbsum.) 

 b Flowering scales not warty 13 



121 



