1. Stout perennial grass of western North America
   - giant ryegrass, Leymus condensatus

Type of: lyme grass

• family Reduviidae
• family Regalecidae
• family relationship
• family Resedaceae
• family Rhamnaceae
• family Rheidae
• family Rhincodontidae
• family Rhinobatidae
• family Rhinocerotidae
• family Rhinolophidae
• family Rhinotermitidae
• family Rhiptoglossa
• family Rhizobiaceae
• family Rhizophoraceae
• family Rhizopogonaceae
• family Rhodymeniaceae
• family Rhyniaceae
• family Rickettsiaceae
• family Roccellaceae
• family room
• family Roridulaceae
• family Rosaceae
• family Rubiaceae
• family Ruscaceae
• family Russulaceae