[1] : WordNet (r) 2.0

agropyron repens
     n : european grass spreading rapidly by creeping rhizomes;
         naturalized in north america as a weed syn: dog grass,
          couch grass, quackgrass, quack grass, quick grass,
          witch grass, witchgrass
see also:
dog grass couch grass quackgrass quack grass quick grass witch grass 
witchgrass 

Agropyron >> A Words
Agropyron, definition of term: Agropyron
agropyron_pag1.html

Serenoa Repens >> S Words
Serenoa Repens, definition of term: Serenoa Repens
serenoa+repens_pag1.html