416 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
culms, having profuse proliferations at each node. Rooting often occurs on these 
nodes making the plants appear stoloniferous, and a short scaly rootstock is sometimes 
seen, as in the Hitchcock specimen collected at Triscornia, Cuba, March 23, 1906. 
The Tracy specimen, mentioned below, has spikes with very long awns closely 
resembling those of B. radicosa. See discussion under B, americana, 
HERBARIUM SPECIMENS. 
West Inpres: Wright 739, Cuba; /[itcheock 452, Triscornia, Cuba; 460, Playa de 
Cojimar, Cuba. Tracy 9088, Triscornia. Sintenis 2269, 2203, and 1959, Porto 
Rico, Curtiss 546, Habana, Cuba. Duss 
1326, Martinique. feller 6057, Porto Rico. 
Leén 293 and 861, Habana. 
33. Bouteloua disticha (IH. B. K.) Benth. 
Dineba divaricata Beauy. Ess. Agrost. 160. 
1812. No description is given; the name 
appears only in the index, where in his pri- 
vate copy of this work Beauvois has written 
‘“==disticha,’? which I interpret to mean 
Polyodon distichum IU. B. K. 
Polyodon distichum H. B. K. Nov. Gen. & 
Sp. 1:175. pl. 55. 1816. I consider the 
specimens seen to be easily identified from 
Kunth’s figures and description. 
Eutriana polyodon Trin, Gram. Unifl, 242. 
1824. Based upon Polyodon  distichum 
H.B.K. 
Atheropogon distichus Spreng. Syst. Veg. 
1: 294. 1825. Based upon Polyodon disti- 
chum H, B, K, 
Bouteloua disticha Benth. Journ. Linn. Soc. 
Bot. 19: 105. 1881. Based upon Polyodon 
distichum 1. B.K. See also Field Mus. Bot. 
3:53. 1903. . 
DESCRIPTION. 
An erect, cespitose perennial, about 30 
em. high, with sparingly branched culms; 
sheaths striate, papillose-hairy, rather loose; 
blades comparatively broad, flat, scabrous 
on the edges, with conspicuous papillose 
hairs, especially toward the base and on the 
edges; ligule a rather conspicuous collar 
with a fringe of ciliate hairs; inflorescence 
Fic. 60.—Bouteloua disticha, a, Spikelet; b,c, racemose; spikes about 25 in number, bilat- 
lemmaand palet of first floret; d, rudimentary eral but sometimes appearing unilateral, 
floret. a, Scale 5; b-d, scale 10. From Schott . . . . 
741 in Field Museum Herb. about 1.5 em. long including awns, spike- 
lets 5 to 8, not pectinate, but more or less 
fascicled, the lower being small and mostly rudimentary, but the upper more 
perfectly developed, the upper florets of the spikelets above the two lower ones 
usually with long-awned lemmas so disposed as to make the spike appear bilaterally 
