1917] Hubbard,— Andropogon in United States and Canada 101 
with glabrous sheaths, but a many-branched, flabellate inflorescence. 
The last two forms also have fairly well marked geographic ranges. 
ANDROPOGON SCOPARIUS Michx. [sensu ampliore]. Schizachyrium 
scoparius (Michx.) Nash in Small FI. S. E. U. S. 59 (1903). Extremely 
variable, commonly strongly cespitose and with fibrous roots, but 
occasionally in sandy localities rather loosely tufted with an apparent 
vertical rootstock up to 5 cm. long. Color of plant green, purplish 
or strongly glaucous. Culms terete to rather strongly compressed, 
of very variable height and usually with only a few widely separated 
nodes, but in the sand form with the basal nodes close together and 
the extreme base of the culm rather indurated. Sheaths convex to 
strongly flattened and almost plicate, glabrous to strongly villous, the 
basal ones all arising from very close to the base of the culm or in the 
sand form from a series of closely situated nodes and apt to be 
strongly equitant and rather fan-spreading. Leaves variable in 
length and breadth, flat to frequently plicate, the mid-rib usually 
prominent below, glabrous on both surfaces to rather strongly vil- 
lous on one or both surfaces. Inflorescence in the commoner form 
open and elongated with relatively few branches varying to rather 
dense and flabellate with many branches in var. polyclados. Bract- 
like sheaths subtending the racemes inconspicuous to rather large and 
spathe-like. Rachis of the raceme nearly straight to very flexuous, 
more or less hairy, the hairs at the top of the internodes varying from 
1 to 5 mm. long. Pedicels of the sterile spikelets variable in length, 
erect to more or less recurved and varying in the density and length 
of the marginal ciliation. Sessile spikelets 4.5-11.5 mm. long with a 
geniculate awn 4-15 mm. long; pedicellate spikelets composed of one 
or less often of two empty glumes, 1-7 mm. long, awnless or terminated 
by an awn which may reach a length of 4 mm. 
Var. VILLOSISSIMUS Kearney ex Scribn. & Ball in Bull. U. S. Div. 
Agrost. 24: 41 (1900). A. scoparius Michx. [sensu stricto] Fl. Bor. 
Am. 1: 57 (1803). Schizachyrium villosissimum (Kearney) Nash in 
Small Fl. S. E. U. S. 59 (1903). Sheaths more or less densely villous. 
Blades sometimes more or less villous on the lower surface, the upper 
surface usually villous at least near the sheath. Inflorescence open 
and elongated. MassacmuserTS: Sesachacha River, Nantucket 
Island, July 26, 1911, E. F. Williams (N. E.) t; Sankaty Head, Nan- 
tucket Island, July 29, 1911, E. F. Williams (N. E.); Nantucket, 
August 18, 1878, E. & C. E. Fazon (Gr., N. E.). NEW JERSEY: 
sandy barrens near Homerstown (New Egypt), Ocean Co., September 
22, 1906, J. H. Grove, no. 403 (Ph.); common in old barren fields ete., 
Brindletown, Ocean Co., August 22, 1905, J. H. Grove (Ph.); margin 
1 In listing herbaria the following abbreviations are used: Gr., Gray; N. E., New England 
Botanical Club; N. Y., New York Botanical Garden; C., Columbia College, deposited at the 
New York Botanical Garden; Ph., Academy of Natural Sciences, Philadelphia, including the 
Philadelphia Botanical Club collection. 
