STENOTAPHRUM 
273 
*¢Stenotaphrum secundatum (Walter) Kunze, St. Augustine grass 
(Ellis, 1990) 
STIPA, porcupine grass, needle grass 
Stipa spartea Trin., porcupine grass, p. 170 
TRIDENS 
Tridens flavus (L.) A. Hitchc., purpletop, tall redtop, p. 120 
var. chapmanii (Small) Shinn. [S: T. chapmanii (Small) 
Chase] (Tateoka, 1961) 
var. flavu 
T. muticus (Torrey) Nash, slim tridens, p. 121 
var. elongatus (Buckley) Shinn. [S: T. elongatus (Buckley) 
Nash] (Tateoka, 1961) , 
T. x oklahomensis (Feath.) Feath. ex Chase, see named hybrids 
T. strictus (Nutt.) Nash, longspike tridens, P- 121 
TRIPLASIS, sand grass 
Triplasis purpurea (Walter) Chapman, sand grass, P: a 
TRIPSACUM, gama grass 
Tripsacum dactyloides (L.) L., eastern gama grass, p. 254 
TRISETUM (see also SPHENOPHOLIS) 
¢Trisetum flavescens (L.) P. Beauv-, yellow oats, P- 139 
: ‘ock 
S: Steyermark G: Great Plains Flora M: Mohlenbr 
