The present study deal with survey and documentation of rare, endanger and threatened plants in Sadhuragiri hills, Southern Western Ghats, Tamil Nadu India. Survey, identification and documentation of plants in study area during 2015-2016. Collections of materials are preserving and documented to college herbarium with referred Standard flora and IUCN (RET) data books. In the present study (45) RET species and they belongs to the (29) families were (18) are rare, (11) were endangered, (10) were Vulnerable, (2) were critically endangered, (3) were threatened and (1) near threatened. RET status were gathered from IUCN, BSI annual reports and standard research articles. From the result plants were categorized into rare, endangered, endemic and threatened, species such as Asparagus racemosus Willd. Decalepis hamiltonii Wight. & Arn, Tylophora indica (Burn. f.) Merr. And Gymnema sylvestre (Retz.) R.Br. ex Schult. so on. Finally it has been suggested that the RET medicinal plants are need to be proper conservation and management plans before it lost forever.