This research has been done to explore the rainforest in the zone along the stream Waterfall Bay motors. Approximately 1000 square metres by converting the sample size 10x10 m, pasting on both sides aligned along the stream Waterfall Bay motors. Top 5 (10 total) and then analyze the value of plant density (D) of plant value (Do) and the frequency of the plant (F) to determine the importance of eco-index (index, IVI Importance value), and analyses of plant biodiversity survey. Study results found a total 30 kinds of plant House plant survey 15 with significant eco-index is higher by quack (Morinda elliptica Ridl.), (35.97), Wild olive (Spondias pinnata Kurz) (31.30) exodus (Sm Microcos tomentosa) (22.35), Po-ikeng (Pterocymbium tinctorium (Blanco) Merr.) (19.49) & (Garc.Inia merguensis Wight) (17.52), respectively. There are 11 cars Bay area, index value wealth-of-a-kind plant (R) is equal to the value of diversity index 7.30 plant (H '), equals 3.24 and plant type consistency index (E) equals 0.95 results from this study can be used as an important basis for the learning of natural sources and used in dealing with the local community to take advantage in the area of sustainable.Keywords: social structure of plants, waterfalls, rainforest, Bay-type plants in society, Biodiversity
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