1922] Linder,—Some Varieties of Panicum virgatum 15 
PANICUM viRGATUM L., var. spissum, n. var., perenne; culmis 
erectis simplicibus numerosis 3.2-11 dm. altis; rhizomatibus brevibus 
statim adscendentibus; laminis 3-4.5 dm. longis 3-7 mm. latis longe 
acuminatis, vaginis glabris; paniculis rare contractis, ramis adscen- 
dentibus inferiore medios superantibus; spiculis quadratis 3.2-4 mm. 
longis; gluma inferiore acuminatia 3-4 nervia; gluma superiore 
lemmatibusque sterilibus subaequalibus 5-7 nerviis paleam super- 
antibus. 
Culms erect, cespitose, from short quickly ascending rootstocks: 
blades 3-4.5 dm. long, 3-7 mm. broad, long-acuminate; sheaths 
glabrous: panicle rarely contracted; rays ascending, the lower 
exceeding the middle and upper ones: spikelets squarish, 3.2-4 mm. 
long: first glume attenuate, 3-4 nerved, two-thirds the length of the 
spikelet: second glume and sterile lemma subequal, 5-7 nerved, and 
exceeding the palea. "This variety, as may be seen from the following 
citations, has its greatest development in eastern Massachusetts and 
Nova Scotia. Nova Scoria: peaty pockets in cobbly beach, Great 
Pubnico Lake, September 6, 1920, Fernald, Long, & Linder, no. 19,766 
(rype in Gray Herb.); gravelly thicket bordering Salmon (Green- 
ville) Lake, August 13, 1920, Fernald, Long, & Linder, no.19,758; 
cobble beach of Butler's (Gavelton) Lake, Gavelton, September 
4, 1920, Fernald, Long, & Linder, no. 19,760; boggy savannah border- 
ing St. John's Lake, Springhaven, October 8, 1920, Fernald, & Linder, 
no. 19,767; sandy and gravelly beach of Bower's (Beaver Dam) Lake, 
September 10, 1921, Fernald & Long, no. 23,187; cobbly beach of 
Jones Lake, Roseway River, August 3, 1921, Fernald & Long, no. 
23,184; upper border of cobbly beach, McKay’s Lake, Middle 
Ohio, Shelbourne County, August, 3, 1921, Fernald & Long, no. 23,183 
upper border of cobbly beach, Wentzell Lake, Lunenburg County, 
August 17, 1921 Fernald & Long, no. 23,185; rocky shore, Gilfilling 
Lake, August 23, Fernald & Long, no. 23,186; cobbly beach, Goven 
Lake, July 23, 1921, Fernald,Long & Bartram, no. 23,182. MAINE: 
railroad ballast, Bangor, September 7, 1916, Fernald & Long, no. 12,- 
480; rocky shore, south end of island, Pushaw Bridge, Oldtown, 
September 18, 1899, Fernald; damp sandy shore, Kezar Lake, Lovell, 
August 30, 1918, Pease, no. 17,288; border of salt marsh, Wells, 
August 8, 1916, Fernald & Long, no. 12,478. New HAMPSHIRE: 
shore of Ossipee Lake, September 9, 1903, T. O. Fuller; salt marsh 
island, Seabrook, August 7, 1898, E. F. Williams. MASSACHUSETTS: 
brackish soil, Amesbury, July 23, White, no. 248; Medford, July 30, 
1880, C.E. Perkins; in wet sand of dune hollows, Plum Island, August 
11, 1913, White, no. 312; edge of cranberry bog near Shawshine River, 
Ballardvale, September 26, 1903, Pease, no. 2,953; Revere, August 
13, 1880, C. E. Perkins; Readville, July 28, 1870, Wm. Boott; Charles 
River, Dedham, July 27, 1883, Fuller; edge of swamp, Concord, 
August 28, H. D. Thoreau; open woods, Scituate, September 6, 1897, 
E. F. Williams; dry sandy upper beach of small pond west of White 
