Sri Lankan Natonal Red List 2020 [flora]. Identifying location for threatened Endemic Angiosperm species

Hi, I have found this map in the Sri Lanka Red List for 2020. I am looking for the location of threatened endemic angiosperms in Matara District on the coast on the southern tip of Sri Lanka - with a view to contacting the landowners and attempting to propagate them. Does anyone know how I can get more information? Thank you