1922] Wiegand,—East-American Species of Bromus 91 
b. Lemmas broader, 3.4-4.0 mm. wide (9-11 mm. long), 
pubescent over much cf the lower part especially near the 
margin, the nerves stronger; glumes generally pubescent; 
nodes usually all included; flanges at summit of sheaths 
usually conspicuous; leaves glabrous or rarely with 
scattered hairs above. c. 
c. Sheaths and usually the blades glabrous or nearly so 
except commonly a pilose ring at summit; nodes 
I EE Ee 2. B. altissimus. 
c. Sheaths and usually the blades villous; nodes usually 
pubescent- a EE forma incanus. 
a. Anthers (2.8) 3-4 mm. long; lemmas broadly elliptical, 3—4 
mm. wide (8-11 mm. long), firmer and more involute when 
old than in the above, inconspicuously nerved except at 
summit; pubescence spread over most of the dorsal sur- 
face, very variable in density; upper nodes usually exsert- 
ed; flanges of the sheaths not apparent. b. 
b. Lemmas hairy c. 
c. Sheaths and usually the blades villous............... 3. B. purgans. 
c. Sheaths and usually the blades (or all but the lowest) 
0 IsMqpen METH forma laevivaginatus. 
b. Lemmas nearly or quite glabrous.................. forma glabriflorus. 
1. B. crura Tvs L. Sp. Pl. 76 (1753). B. canadensis Michx. Fl. Bor. 
Am. i. 65 (1803). —Labrador to Pennsylvania and westward to Min- 
nesota, British Columbia, Oregon and Nevada. 
Forma denudatus f. nov., vaginis glabris infimis interdum exceptis. 
—Throughout the range of the typical form; not uncommon. TYPE 
in Gray Herb.; Ashfield, Massachusetts, 1909, E. F. Williams. 
Forma laeviglumis (Scribn.) comb. nov., B. ciliatus laeviglu- 
mis Scribn. in Shear, Bull. U. S. Div. Agrost. xxiii. 32 (1900) — Oc- 
casional; reported from Maine, North Carolina and Ontario. The 
Gray Herbarium specimen of the Maine plant cited by Shear (Fer- 
nald & Strong, no. 488) is B. altissimus Pursh. 
In Central New York B. ciliatus is genecally an inhabitant of marl 
springs and calcareous boggy places. In other portions of its range 
it does not seem to be confined to boggy places or even to calcareous 
situations, yet no structural difference is apparent between the New 
York material and that from elsewhere. 
2. B. ALTISSIMUS Pursh, Fl. Am. Sept. ii. 728 (1814), teste Shear. 
B. ciliatus, var. Porteri Rydb. Contr. U. S. Nat. Herb. iii. 192 (1895), 
teste Shear. B. purgans latiglumis Shear, Bull. U. S. Div. Agrost. 
xxii. 40 (1900). B. latiglumis Hitche. Rmopoma viii. 211 (1906). 
— A plant of alluvial bottomlands and alluvial stream banks in 
calcareous regions: northern Maine and western Connecticut to Penn- 
sylvania, and through New York to Iowa (Montana, Nebraska and 
Missouri, Shear). 
Forma incanus (Shear) comb. nov. B. purgans incanus Shear, 
Bull. U. S. Div. Agrost. no. 23, 41 (1900). B. incanus Hitchcock, 
Ruopora viii. 212 (1906)— Central Maine, Vermont, western Con- 
