PANICE.E. 145 



the neuter floret equal, the former 7-uerved, the latter 9-nerved; 

 fourth glume (palea of the neuter floret) obovate, 3 mm. long, 

 with a long callous base ; upper floret shining, smooth, oval, sub- 

 acute, 3.5 mm. long. 



Mexico (Jalisco). Pr ingle 1732. 



73. P. Walteri Poir. Lam. Encycl. Suppl. 4:282 (1816). 



P. latifoUum Walt. Fl. Car, 73 (1788), not L., teste Swartz. 



Perennial, from tufted rootstocks. Culms smooth, erect, simple 

 or sparingly branching, 30-70 cm. high. Leaf-blades 11-15-nerved, 

 9-11 cm. long, 2-3.5 cm. wide, ovate-lanceolate or oblong-lanceolate, 

 rather abruptly taper-pointed, the base cordate-clasping, mostly 

 smooth except the throat, margins near the base, and lower end 

 of the sheath near the nodes, Avhich are villous. Panicle simple, 

 usually exserted, often on a long peduncle; rays spreading, 7-12 

 cm. long. Spikelets often downy, obovate, 3-4 mm. long (mostly 

 3.5); first glume 1-nerved, 1 mm. or more long, second 9-13- 

 nerved; lower floret staminate, floral glume 7-13-nerved, its palea but 

 little shorter; fertile floret elliptical, subacute, 2.5-3.3 mm. long. 



Much like P. clandestinum, but blades more tapering below the 

 middle, tapering more abruptly, with concave margins above, 

 mostly shorter and wider. 



A plant from Dr. Vasey, collected at Washington, D.C., 

 1884, marked " typical " has hairy sheaths, blades 10 cm. by 2 cm., 

 panicles small, branches stout. Spikelets 4 mm. long. 



Michigan, Beal 21, Ansf in; Massachusetts, Beal 22; New York, 

 Beal 23 ; Minnesota, Holzinfjer 32 ; District of Columbia, McCarthy. 



Found from New England to Texas. 



Var. molle Vasey, Contrib. U. S. Nat. Herb. 3:33 (1892). 

 Smaller, more slender, soft velvety-pubescent throughout. District 

 of Columbia, Vasey for U. S. Dept. Agricul. 



Virginia to Louisiana. 



27. (9) ICHNANTHUS Beauv. Agrost. 56, t. 12, f. 1 (1812). JVa- 

 vicidaria Raddi, Agrost. Bras. 38 (1823). 



Spikelets ovate or acuminate, short-pedicellate on the branches 

 of the panicle, with one perfect terminal flower and a lateral stami- 

 nate flower. 



