1917] Hubbard,— Andropogon in United States and Canada 103 
no. 107. Firortpa: Tampa, R. Combs, no. 1348. Inpiana: Dune 
Park, Agnes Chase, no. 622. ILLINoIs: Bath, H. A. Gleason. Iowa: 
Carnarvon, L. H. Pammel, no. 294; Winterset, G. W. Carver, no. 266. 
The inflorescence of two specimens shows a marked tendency toward 
var. polyclados. Fiortpa: Braidentown, S. M. Tracy, no. 7092. 
Mississippi: Biloxi, S. M. Tracy, no. 1397 [only the upper portion of 
the plant, which also has sparsely villous sheaths]. There is also one 
specimen in the herbarium of the New England Botanical Club, 
Massacuuserts: gravelly pasture, Concord, September, Edward S. 
Hoar, which belongs in this variety, but the certainty of its being from 
Concord is open to some question and consequently it was omitted 
from the general citation of specimens. 
Var. frequens Hubb., var. nov.! Plerumque dense caespitosa; 
vaginis foliisque glabris (laminis supra basin versus interdum paullo 
villosis); inflorescentia elongata simplice laxa. 
Usually densely cespitose with glabrous sheaths and leaves (some- 
times the base of the blade somewhat villous on the upper surface) 
and with an elongated, simple, open inflorescence. RHODE ISLAND: 
dry open fields and hillsides near Dickens Point, Block Island, New- 
port Co., September 15, 1913, M. L. Fernald, Bayard Long and G. S. 
Torrey, no. 8476 (TYPE in Gray Herb., N. E., Ph.). General distri- 
bution New Brunswick to Saskatchewan and Montana south to 
Georgia, Texas and eastern Arizona. The species is also reported 
from Washington [Nash in N. Am. Fl. 17: 106 (1912)], but I have seen 
no specimens and can find no other reference to it in that state, nor 
have I seen specimens of this variety from Florida. 
Variety frequens is the common form of the species showing a wide 
range of variation, but no constant grouping of characters which would 
justify subdivision. Certain specimens growing in sandy locations 
or in railroad ballast show more nodes at the base of the culm, more 
compression of the basal sheaths and a tendency to produce vertical 
rootstocks, but these characters are variable and not always combined. 
The following specimens show a strong tendency toward var. poly- 
clados. PENNSYLVANIA: serpentine barrens, Mineral Hill, Delaware 
Co., September 6, 1908, Francis W. Pennell. no. 597 (Ph.). Missouri: 
fields, Hannibal, October 26, 1911, John Davis, no. 1425 (Gr.). 
Var. POLYCLADOS Scribn. & Ball in Bull. U. S. Div. Agrost. 24: 
40 (1900). A. littoralis Nash in Britton Man. 69 (1901). A. sco- 
parius var. littoralis (Nash) Hitche. in Ruopora 8: 205 (1906). 
Schizachyrium littorale (Nash) Bicknell in Bull. Torr. Bot. Cl. 35: 
182 (1908). Sometimes densely tufted, with more or less strongly 
flattened, glabrous sheaths. Leaves glabrous on the lower surface, 
glabrous or more or less villous above especially toward the base. 
Inflorescence many branched above and more or less densely flabellate. 
. 
1 A. purpurascens Muhl..ex Willd. Sp. Pl. 4: 913 (1806) and A. flexilis Bosc ex Poir. in Lam, 
Encycl. Suppl. 1: 583 (1810) probably belong here. 
