486 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
VIRGATA. 
Perennials, mostly with stout rootstocks, one species, P. ichnanthoides found to be 
without rootstocks. 
Ureepine rootsipeks WANS. 222-252 ale see en eee wee eee 40. P. ichnanthoides. 
Creeping rootstocks present. 
Spikelets not over 2.5 mm. long; first glume less than half the 
length of the spikelet. 
Panicles loosely flowered; first glume truncate, about - 
one-fifth the length of the spikelet..........--- 37. P: repens. 
Panicles rather densely flowered; first glume triangular, 
about one-third the length of the spikelet......-. 38. P. gouini. 
Spikelets 3 to 7 mm. long (sometimes less than 3 mm. in P. 
| virgatum cubense); first glume more than half the length 
of the spikelet. 
Culms decumbent or creeping at base. 
a ? /, } LE. i Spikelets 3:2 to 4mm: long. 222.2202. te ee 4}. 
: Spikelets40 Samm lone. 255.2 oo ee ee ee 
Culms erect. 
Panicles elongate, strongly contracted; seacoast 
POLAINGS! ae Lees Ss he tires ORE Re ae 43. P. amarulum. 
Panicles diffuse or only slightly contracted; plants 
sometimes of salt marshes but not littoral. 
Panicles open, loosely-flowered; spikelets 3.5 to 
5 mm. long, beaked; first glume two- 
thirds the length of the spikelet or more, 
acuminate-pointed 22 225. -s2ncc-s5s-e 39. P. virgatum. 
Panicles somewhat contracted; spikelets not 
over 3.2 mm. long, not beaked; first 
glume about half the length of the spike- 
let; not acuminatel: 20.-2- arene ee eee 392. P.virgatum 
cubense. 
. altum. 
. havardit. 
nek as 
87. Panicum repens L. 
Panicum repens L. Sp. Pl. ed. 2. 87. 1762; Contr. U. 8. Nat. Herb. 15: 85. 1910. 
DISTRIBUTION. 
Sea beaches, warmer regions of both 
hemispheres; in America from Ala- 
bama to Brazil. Originally described 
from the Old World. 
Nicaracua: Without locality, 
Flint 8. 
Cusa: Arroyo Apolo, Ledn 296, 
Fig. 51.—Distribution of P. repens. 563. Habana, Leén in 1909. 
