18 
2a. 
3a. 
Rhodora [FEBRUARY 
Pl. 5, fig. 4. 1824. Agrostis sobolifera Muhl. in Willd. Enum. 95. 
1809. Trichochloa sobolifera Trin. l. c. 
MUHLENBERGIA SOBOLIFERA setigera Scribn. n. subsp. Culms. 
very slender, much branched; lemmas awned; awns 1-3 mm. 
long. Otherwise as in the species. Type, no. 70 J. Reverchon, 
Texas, in Natl. Herb. No. 1054 J. Reverchon in Natl. Herb., also 
from Texas, belongs here. 
MUHLENBERGIA TENUIFLORA (Willd.) B. S. P. Prelim. Cat. 
Pl. N. Y. 67. 1888. Agrostis tenuiflora Willd. Sp. Pl. 1:364. 
1797. Muhlenbergia Willdenowi? Trin. Gram. Unifl. 188. 1824. 
Trichochloa longiseta Trin. Fund. Agros. 117. 1820. 
MUHLENBERGIA TENUIFLORA variabilis Scribn. n. subsp. Culms 
smooth at the nodes, much branched above; panicles linear, 
strict, erect, more rigid than in the species; spikelets 4 mm. long; 
lemmas mucronate or short-awned; awns 2-3 mm. long. Type, 
no. 654a Biltmore Herbarium from Chimney Mountain, Ruther- 
ford, North Carolina, distributed as Muhlenbergia sobolifera. 
SECTION 3. Glumes narrow, acuminate or aristate, nearly as long 
as or exceeding the lemmas in length. (Acrowis Trin. Fund. Agros. 
117, as a section of T'richochloa.) 
4. 
4a. 
MUHLENBERGIA MEXICANA (Linn.) Trin. Gram. Unifl. 189. 
1824. Agrostris mexicana Linn. Mant. 1:31. 1767. Tricho- 
chloa mexicana Trin. Fund. Agros. 117. 1820. Muhlenbergia 
polystachya Mac. & Bush. Trans. Acad. Sci. St. Louis, 12: 79. 
Pl. 12. 1902. Agrostis lateriflora Michx. Flor. Bor. Am. 1:53. 
1803. Culms diffusely branched throughout from the base; 
panicles numerous, 3-10 (usually about 6) cm. long, oblong- 
ovoid or subpyramidal, rarely linear, the base usually enclosed 
within the subtending leaf-sheath. 
MUHLENBERGIA MEXICANA commutata Scribn. n. subsp. 
Lemmas awned; awns 4-10 mm. long. Otherwise as in the spe- 
cies. (M. sylvatica, in part of authors.) Quite distinct from 
Agrostis sylvatica Torr. upon which Muhlenbergia sylvatica was 
based. Specimens in Natl. Herb.: no. 171 M. L. Fernald, 
1893 and nos. 528, 1894 and 522, 1896, all from Maine; no. 80 
Wm. Harriot, 1901, from Ontario and no. 26,245 J. Macoun, 
1901, from the same region. Other specimens from New York, 
Delaware, Pennsylvania, Illinois and Minnesota. The speci- 
mens from Delaware (no. 206 4. Commons) have aristate glumes. 
————EE" 
