226 NORTH AMERICAN FLORA [VOUJM3 17 



long, narrowly ovate, more finely transversely rugose than in P. maximum, the bluntly pointed 

 apex puberulent. 



Type locality: Near Guanajuato, Guanajuato. 

 Distribution: New Mexico to Arizona and southern Mexico. 



Illustrations: Bull. U. S. Dep. Agr. Bot. 12 1 : pi. 2; Bull. U. S. Dep. Agr. Agrost. 7: /. 56 

 Contr. TJ. S. Nat. Herb. 15: /. 71. 



Panicum bulbosum minus Vasey, Bull. U. S. Dep. Agr. Bot. 8: 38. 1889. Panicum sciaphilum 

 Rupr.; Fourn. Mex. PL Gram. 19. 1886. Panicum bulbosum sciaphyllum Hitchc. & Chase, Contr. 

 U.S.Nat. Herb. 15: 83. 1910. Distinguished by its smaller size, narrower blades and smaller 

 spikelets (2.8-3.2 mm. long). Illustration: Contr. U. S. Nat. Herb. 15: /. 73. 



44. Panicum repens I,. Sp. PL ed. 2. 87. 1762. 



Panicum notatum Retz. Obs. 4: 18. 1786. 

 Panicum arenarium Brot. Fl. L,usit. 1: 82. 1804. 

 Panicum Uttorale C. Mohr; Vasey, Bot. Gaz. 4: 106. 1879. 



Culms rigid, 30-80 cm. high, erect or ascending from the nodes of strong, horizontal, often 

 extensively creeping rootstocks, simple, clothed at the base with bladeless, overlapping sheaths; 

 upper leaves numerous, their sheaths usually overlapping, rather loose, more or less pilose, 

 especially along the margin, or sometimes glabrous; ligule about 1 mm. long; blades 4r-15 cm. 

 long, 2-5 mm. wide, or those of sterile shoots sometimes longer and wider, firm, stiffly as- 

 cending or spreading, often conspicuously distichous, flat or folded, long-pilose at the base on 

 the upper surface, otherwise sparsely pilose to glabrous on both surfaces; panicles rather short- 

 exserted, stramineous, 7-12 cm. long, one third to two thirds as wide, the somewhat distant 

 branches stiffly ascending, rarely spreading, usually naked at the base, bearing short, appressed 

 branchlets with short-pediceled, approximate spikelets toward the ends; spikelets 2.2-2.5 mm. 

 long, 1-1.1 mm. wide, ovate, abruptly pointed; first glume about one fifth as long as the spike- 

 let, broad, loose and truncate, obscurely nerved; second glume and sterile lemma equal, 5—7- 

 nerved; fruit 1.8-1.9 mm. long, about 1 mm. wide, obovate-elliptic. 



Type locality: Probably Spain. 



Distribution: Sea beaches from. Alabama to Brazil; also in the warmer parts of the Old 

 World. 



Illustrations: Cav. Ic. pi. 110; Contr. U. S. Nat. Herb. 15: /. 75. 



45. Panicum. Gouini Fourn. Mex. PI. Gram. 28. 1886. 



Panicum Gouini pumilum Fourn. Mex. PI. Gram. 28. 1886. 



Panicum repens confertum Vasey, Bull. Torrey Club 13: 25. 1886. 



Panicum halophilum Nash; L,loyd & Tracy, Bull. Torrey Club 28: 86. 1901. 



Plants like P. repens in habit; culms on the average lower, rarely more than 30 cm. high; 

 leaf-sheaths and blades usually glabrous, more crowded than common in P. repens; panicles 

 smaller, narrower, more, densely flowered, commonly purple ; spikelets 2-2.4 mm. long, about 

 1 mm. wide; first glume broadly triangular, one third to nearly half the length of the spikelet; 

 second glume slightly shorter than the sterile lemma. 



Typb locality: Vera Cruz. 



Distribution: Sea beaches from Alabama to the state of Vera Cruz. 



Illustrations: Bull. U, S. Dep. Agr. Agrost. 7: f. 52 (as P. repens); Contr. XJ. S. Nat. Herb. 

 15: /. 77. 



46. Panicum virgatum L. Sp. PI. 59. 1753. 



Panicum coloratum Walt. Fl. Car. 73. 1788. Not P. coloratum L/. 1767. 



Eatonia purpurascens Raf. Jour.de Phys. 89: 104. 1819. 



Panicum pruinosum Bernh.; Trin. Gram. Pan. 191, as synonym. 1826. 



Panicum giganteum Scheele, L/innaea 22: 340. 1849. 



Panicum glaberrimum Steud. Syn. Gram, 94. 1854. 



Ichnanthus glaber Link; Steud. Syn. Gram. 94, as synonym. 1854. 



Panicum Kunthii Fourn.; Hemsl. Biol. Centr. Am. Bot. 3: 490. 1885. Not P. Kunthii Steud. 



1841. 

 Panicum virgatum confertum Vasey, Bull. Torrey Club 13: 26. 1886. 

 Panicum virgatum elongatum Vasey, Bull. Torrey Club 13: 26. 1886. 

 Panicum virgatum diffusum Vasey, Bull. Torrey Club 13: 26. 1886. 

 Chasea virgata Nieuwl. Am. Midi. Nat. 2: 64. 1911. 

 Milium virgatum IyUnell, Am. Midi. Nat. 4: 212. 1915. 



Plants erect, usually 1-2 meters high, producing numerous scaly, creeping rootstocks, 

 glabrous throughout except as noted, commonly purple-tinged, often glaucous, especially on 

 the internodes and upper surface of the blades; culms in large to small clumps or even solitary, 



