HITCHCOCK AND CHASE—NORTH AMERICAN PANICUM. 219 
DESCRIPTION. 
Vernal form suberect or stiffly spreading, bluish green, often purplish; culms 25 to 
60 em. high, slender, papillose-pilose, or the upper portion glabrous; sheaths spread- 
ing-pubescent, rarely nearly glabrous; ligules dense, 4 to 5 mm. long; blades firm 
with a thin white cartilaginous margin, ascending or suberect, 6 to 9 em. long, 5 to 8 
mm., rarely 10 mm., wide (the upper smaller), often sparsely ciate at base, the veins 
usually conspicuous, the upper surface glabrous or with a few long, scattered hairs 
toward the base, the lower surface appressed-pubescent or nearly glabrous; panicle 
4to 7 cm. long, nearly as wide, rather densely flowered, 
the lower branches ascending; spikelets 1.6 to 1.7 mm. 
long, 0.8 to 1 mm. wide, obovate-obtuse, turgid, pubes- 
cent; first glume about one-fourth the length of the 
spikelet; second glume shorter than the sterile lemma, 
leaving the summit of the fruit exposed at maturity; fruit 
1.4 mm. long, 0.8 mm. wide, elliptic, obtuse. 
Autumnal form widely spreading or decumbent, with 
numerous fascicled, somewhat flabellate, branches, oiten 
forming prostrate mats; leaves much reduced, the blades 
usually.ciliate at base; winter rosette formed early. 
This species resembles /. lindheimert and P. huachucae silvicola. From the former 
it differs in the larger spikelets, pilose sheaths, and more or less white-margined blades, 
which are often pubescent beneath, from the latter, in the firmer blades, glabrous 
above, and from both in the prostrate, mat-like autumnal form. Two vernal specimens 
from Connecticut, Graves 13 and 75 in 1899, are referred here doubtfully because of the 
looser panicle and rather numerous hairs on the upper surface of the blades. Two 
specimens with spikelets about 2 mm. long are referred doubtfully to P. tennesscense, 
one from Jefferson County, Missouri (Zggert 242) and one from Sapulpa, Oklahoma 
(Bush 711). 
Fic. 225.—P. tennesseense. From 
type specimen. 
DISTRIBUTION. 
Open rather moist ground and borders of woods, Maine to Minnesota, and south to 
Georgia, Mississippi, and Arkansas; also in Colorado and Utah. 
Marne: Dover, G. B. Fernald 507; St. Francis, Fernald 166a; Fort Fairfield, 
Fernald 166; Cape Elizabeth, 
Chase 3457; Chesterville, Chase 
3301; Fayette, Chase 3399; 
Hartford, Parlin 2017. 
New Hamesuire: Nashua, Robin- 
son 789 (Gray Herb.). 
Vermont: Westmore, Eggleston 
2181 (Gray Herb.). 
Massacuusetts: ramingham, 
Smith 741, 743. 
Connecticut: Hartford, Driggs 3; 
Preston, Graves 11; Branford, Fic. 226.—Distribution of P. tennesscense. 
Bissell 5611. 
Ruope Istanp: Providence, Collins in 1891 (Gray Herb.). 
New York: Thousand Islands, Ball 816, Robinson & Maxon 86; Ithaca, Coville 
in 1885; Apalachin, Menno 13, 17; Ausable Chasm, Jones in 1898; Jamaica, 
Bicknell in 1905; Valley Stream, Bicknell, in 1905; Rosedale, Bicknell in 1904; 
Rockville Center, Bicknell in 1902; Edgemere, Bicknell in 1902; Hewlett, 
Bicknell in 1905. 
Ontario: Algonquin Park, Macoun 72965. 
