DCHP-1 Online
spear grass 
any of several species of tough, irritating grass, such as Poa pratensis or Stipa columbiana.
- 1881 (1957) Spear grass, which is something like wild oats, works right through boots, stockings, trousers, and everything.
- 1952 The most typical montane landscape . . . is a scattered parklike stand of ponderosa pine amidst a steppe vegetation of bunch grass . . . spear grass. . . .
- 1953 The sheep crop the "prairie wool"--that excellent hard forage composed of spear-grass, bunch-grass and buffalo-grass.
- 1881 (1957) Spear grass, which is something like wild oats, works right through boots, stockings, trousers, and everything.