LAMSON-SCRIBNER: NOTES ON MUHLENBERGIA 327 
Federal District, alt. 8500 ft.; Pringle, 1893 (lemmas barely 
mucronate-pointed and scabrous near the tip, a form approaching 
the allied M. Parishii). 
Muhlenbergia polycaulis Scribn. sp. nov. 
A slender, wiry, erect, or ascending, glabrous, leafy perennial, 
3-4 or 5 dm. high, from creeping rootstocks, with linear attenuate- 
pointed, scabrous leaves, slender, rather densely flowered panicles, 
and long-awned spikelets 3-4 mm. long; culms terete, fasciculately 
branched at the base, glabrous or minutely scabropubescent below 
the nodes; sheaths scabrous, terete, longer than the internodes; 
ligule about 1 mm. long, ciliate on the edge and more or less 
lacerate; leaves about 7 on each culm, 2-6 cm. long, I-2 mm. wide 
or less; panicles 5-10 cm. long, main axis scabrous, flattened or 
triangular and somewhat flexuose; branches solitary or the lower 
ones in pairs, the lowermost somewhat remote and 2-4 cm. long, 
the upper shorter and approximate, all erect or appressed; spike- 
lets not crowded as in M. Lemmoni, the longer branches naked 
below, pedicels scabropubescent, nearly equaling or much shorter 
than the spikelets; glumes subequal, a little shorter than the 
florets, broadly ovate-lanceolate or lanceolate, very abruptly — 
mucronate or short-awned, scabropubescent on the keel above, 
smooth below; lemmas broadly lanceolate, minutely 2-toothed 
at the apex, densely villous in the lower half; palea lanceolate- 
oblong, nearly equaling the lemma in length and similarly villous 
in the lower half; awn very slender and hairlike, more or less 
flexuose, 10-24 (usually about 20) mm. long. 
Type, C. G. Pringle 1414, 1887. 
Closely allied to M. Lemmoni, but more slender, with narrower 
leaves, long-awned and less crowded spikelets. 
This species is represented in the National Herbarium by the 
following specimens: 
Texas: S. B. Buckley, no number. 
Arizona: C. G. Pringle 480, 1884 (not 480 of the collection of 
1881); Griffiths 7036, 1904. Panicle more loosely flowered than 
in the type, and glumes purplish. 
Mexico: Pringle 394, 1885; Pringle 1414, collected on dry 
shaded ledges, Sierra Madre Mts., State of Chihuahua, Sept. 30, 
1887; Pringle 394, 1885; E. Palmer 592 and 724, 1896. 
