POACEAE 121 
usually dense and interrupted : spikelets much crowded, the empty scales acuminate, 4-6 
mm. long, including the awn, the flowering scale 2-3 as long, acuminate, the strongly 
scabrous midnerve excurrent as a short point. [M. glomerata Trin. ] 
In wet places, Newfoundland to British Columbia, New Jersey, North Carolina, Missouri, and 
New Mexico. Summer and fall. 
4. Muhlenbergia sylvatica Torr. Stems 3-9 dm. tall, erect, branched: leaf-blades 
9-18 em. long, 2-6 mm. wide, rough : panicle 7-18 cm. long, somewhat lax : empty scales 
of the spikelet 2.5-3 mm. long, awn-pointed, rough, the third scale equalling or somewhat 
exceeding the outer ones, very rough, attenuate into a slender awn 2-4 times its length. 
In moist woods and along streams, New Brunswick to Ontario, Minnesota, North Carolina, Ten- 
nessee, Nebraska and the Indian Territory. Summer and fall. 
5. Muhlenbergia tenuiflora (Willd.) B.S.P. Stems 6-9 dm. tall, erect, slender, 
simple or sparingly branched : leaf-blades 6-18 cm. long, 2-8 mm. wide, narrowed toward 
the base, acuminate, rough : panicle 1-2.5 dm. long, slender: empty scales of the spikelet 
unequal, j-3 the length of the flowering scale, awn-pointed, rough, the flowering one 
2.5-3 mm. long, rough, bearing an awn 2-4 times its length. [M. Wildenovii Trin. ] 
A AR rocky woods, Massachusetts to southern Ontaria, Minnesota, Alabama and Texas. Summer 
an all. 
6. Muhlenbergia diffüsa Willd. Stems 3-9 dm. long, decumbent, or often prostrate 
or creeping and ascending, very slender, diffusely branched : leaf-blades 4-9 cm. long, 1-4 
mm. wide, rough: panicle 5-20 cm. long, slender, somewhat lax: empty scales of the 
spikelet minute, the lower one often wanting, the flowering scale, exclusive of the awn, 
about 2 mm. long, very rough, especially on the nerves, the awn 1-4 mm. long. 
On dry hills and in woods, Maine and southern Ontario to Minnesota, Florida, Kansas and 
Texas, Summer and fall. 
7. Muhlenbergia trichépodes ( Ell.) Chapm. Stems tufted, wiry, 7-10 dm. tall : 
leaf-blades long and narrow, stiff, often involute when dry: panicle 2-4 dm. long, its 
branches erect: spikelets, exclusive of the awn, 3.5-4.5 mm. long, the empty scales 
acuminate, shorter than the flowering scale, sometimes awn-pointed, the flowering one 
bearing a short awn 2 mm. long or less. 
In pine lands, North Carolina to Florida and Texas. Summer and fall. 
8. Muhlenbergia capiilàris ( Lam.) Trin. Stems erect, wiry, tufted, 5-12 dm. tall : 
leaf-blades long and narrow, often involute when dry, 1-3 mm. wide: panicle 1.5-4 dm. 
long, its branches spreading or ascending : spikelets, exclusive of the awn, 3.5-4 mm. long, 
lanceolate, acuminate, the empty scales usually J as long as the spikelet or less, commonly 
bearing a short awn, the flowering scale bearing an awn longer than its body, sometimes 2 
cm. long. [M. caespitosa Chapm. ] 
In dry soil and pine lands, Massachusetts, New Jersey and Missouri to Florida, the Indian Terri- 
tory and Texas. Alsoin Cuba. Fall. 
9. Muhlenbergia fílipes M. A. Curtis. Stems tufted, erect, wiry, 5-10 dm. tall: 
leaf-blades long and narrow, involute, at least when dry, 1-2 mm. wide: panicle 2-3 dm. 
long, often included at the base, its long branches spreading or ascending : spikelets, ex- 
clusive of the awns, 4-5 mm. long, lanceolate, acuminate, the empty scales J as long as the 
spikelet or less, bearing a long awn, that on the second scale, and also often that on the first, 
frequently much exceeding the spikelet. 
In sands on the seashore and in pine lands, North Carolina to Florida and Mississippi. Fall. 
10. Muhlenbergia Pdrteri Scribn. Stems 2-6 dm. long, much branched and pros- 
trate: leaf-blades 3-6 cm. long, 1-2 mm. wide, flat, acuminate, linear: panicles 8-10 cm. 
long, the branches widely spreading, rather stiff: spikelets, exclusive of the awn, 3-4 mm. 
long, the empty scales acuminate, shorter than the spikelet, the flowering one bearing an 
awn 5-10 mm. long. 
On hills and plains, central Texas to southern Oalifornia. Summer and fall. 
56. BRACHYÉLYTRUM Beauv. 
Tall perennial grasses, with rather broad flat leaf-blades and a terminal narrow panicle, 
its branches few, erect and filiform. Spikelets 1-flowered, narrow, the rachilla produced 
beyond the flower into a long glabrous stipe which sometimes bears a small scale at its 
apex. Scales 3 (or rarely 4), the 2 outer empty, persistent, very small, the first minute, 
sometimes almost wanting, the third scale elongated, rather rigid, acuminate into a long 
erect awn and enclosing a somewhat short dorsally suleate 2-nerved palet of similar texture 
and a perfect flower, a fourth scale sometimes terminating the rachilla-prolongation. 
Stamens 2. Styles short, distinct. Stigmas elongated, plumose. 
