HITCHCOCK AND CHASE—NORTH AMERICAN PANICUM. 85 
Panicles diffuse, or only slightly contracted; plants some- 
times of salt marshes but not littoral. 
Spikelets 6 to 8 mm. long; culms solitary, with a 
creeping base...................-...- ceeeeeee 45. P. havardit. 
Spikelets less than 5 mm. long (in exceptional speci- 
mens 6 mm. long); culms erect, producing 
numerous scaly rootstocks. 
Panicles open, loosely-flowered; spikelets 3.5 to 
5 mm. long, beaked; first glume two-thirds 
the length of the spikelet or more, acumi- 
nate-pointed ................222.2-...-20-- 44, P. virgatum. 
Panicles somewhat contracted; spikelets not over 
3.2 mm. long, not beaked; first glume about 
half the length of the spikelet, not acumi- 
nate... 2.2.22. ee ene 44a. P. virgatum cub- 
ense. 
42. Panicum repens L. 
Panicum repens L. Sp. Pl. ed. 2. 87. 1762. ‘‘ Habitat in Hispania? inde missum a 
Claud. Alstraemer.’’ The type specimen is in the Linnean Herbarium. 
Panicum notatum Retz. Obs. Bot. 4:18. 1786. “In Sumatra * * * D. 
WENNERBERG.”’ The specimen from Sumatra in the Willdenow Herbarium labeled 
Panicum notatum, though probably not the type, agrees with the description and 
may be regarded as an authentic specimen. 
Panicum arenarium Brot. Fl. Lusit. 1: 82. 1804. “Hab. in arenosis subhumidis; 
occurrit in Algarbiis.’” We have not seen the type specimen, but the ample descrip- 
tion and the plate given later by Brotero4 clearly identify this species with P. repens L. 
Panicum littorale Mohr; Vasey, Bot. Gaz. 4: 106. 1879. ‘Mobile, Alabama,”’ sent 
by “Mr. Chas. Mohr.”” The type specimen, in the National Herbarium, was collected 
by Dr. Mohr, July 4, 1877. 
A few other names based on Old World plants, the type specimens of which we 
have not seen, are referred to P. repens as synonyms 
by various authors. 
DESCRIPTION, 
Culms rigid, 30 to 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 numer- 
ous, the sheaths usually overlapping, rather loose, 
more or less pilose, especially along the margin, or Via. 75.—P. repens, From type 
sometimes glabrous; ligules about 1 mm. long; blades gpocimens of P. littorale Mohr. 
4 to 15 cm. long, 2 to 5 mm. wide, or those of sterile 
shoots sometimes longer and wider, firm, stiffly ascending or spreading, often conspic- 
uously distichous, flat or folded, long-pilose at the base on the upper surface, other- 
wise sparsely pilose to glabrous on both surfaces; panicles rather short-exserted, 
stramineous, 7 to 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 to 2.5 mm. long, 1 to 1.1 mm. wide, ovate, abruptly pointed; first glume 
4 Brot. Phytog. Lusit. 1:15. pl. 6. 1816. 
