Cynodon dactylon, commonly known as Bermuda grass, and also known as Couch grass in Australia & New Zealand is a grass found worldwide. It is native to Europe, Africa, Australia and much of Asia. It has been introduced to the Americas. Contrary to its common name, it is not native to Bermuda and is in fact an abundant invasive species there. In Bermuda it has been known as "crab grass". Other names are Dhoob, dūrvā grass, ethana grass, dubo, dog grass, dog's tooth grass, Bahama grass, crab grass, devil's grass, couch grass, Indian doab, arugampul, grama, wiregrass and scutch grass.

दूर्वा ही औषधी वनस्पती आहे. या वनस्पतीचे शास्त्रीय नाव Cynadon dactylon असे असून त्याचे कूळ Poaceae किंवा Gramineae हे आहे.ही वनस्पती वर्षभर उपलब्ध असते. पावसाळ्यात हीई मोठ्या प्रमाणावर उगवते. सप्टेंबर-ऑक्टोबर तसेच फेब्रुवारी-मार्च या महिन्यात या वनस्पतीला फुले येतात.