Palestine has a wide range of agro-ecological concerns, particular geographic location, with a series of environmental, a unique biodiversity and a large variety of plants    , it has a Mediterranean climate, characterized by mild rainy winters and hot dry summers, with a tropical-subtropical tendency in the far south, and rainfall decreases from north to south, while the temperature increases  . Climate and bioclimate were played an important role in influence on plant communities, plant production, and biological resources  -  .
In Palestine, about 2780 plant taxa were recorded as native, which of 159  , 162 taxa were recorded as endemics   . Moreover, it is found that about 2750 species of plants including 138 families were estimated for Palestinian flora  ,  , while in the other study the flora of Palestine includes 149 endemic species  , (6% of the total flora), which of 43% are found to be common, 27.5% are rare and 25.6% are very rare. The recent study there recorded more than 1881 species of plant, which of 53 are endemic rare species in the fourth areas of Palestine as Hebron, Ramallah, Jericho and Jenin  , and we described eight new plant associations, of which two have a dry-sub-humid ombrotype (Pistacio palaestinae-Quercetum lokii; Cerasus microcarpae-Quercetum ithaburensis) in the area of Idna, Hebron of Palestine  .
The aim of this paper is to provide a botanical study of the flora and vegetation growing in the Idna-Hebron of Palestine.
2. Materials and Methods
In our study and survey consists of up to 17 vegetation grids distributed over one area with three different names as (Abu Salman Forest Reserve, Khallet Osman and Aslimi) (Figure 1). The sampling area ranged from 400 to 430 dunums, according to the vegetation unit concerned, forest and very little scrubland (trees only). Nevertheless, for each one, we provide the records of altitude, slope, area, cover rate, orientation and number of species. In our phytosociological
Figure 1. Represent the study area in Idna village by satellite.
approach is fundamentally based on the Braun-Blanquet (1979)  method, we have taken into account the advances in the method pointed out by Pott (2011)  and Biondi (2011)  .
However, we made a comprehensive floristic study of these 17 grids, singled out the respective endemic species and identified the floristic differences in the territories involved. The phytosociological indexes are converted to the Van der Maarel (1979)  scale for a proper statistical analysis, these data were used to create an Excel table with 48 rows (plants) and 17 columns (grids). Moreover, from this table we generated a Euclidean Distance Matrix to measure the distance, with the relevant data on community plant physiognomy, average height of dominant species and abundance dominance index, we created a table with the dominant species of each of the 17 grids. We took values over 6 m as the average forest height, dominant species with average height values ranging from 3.5 to 7 m could be described to forest as well as to scrubland environments as Cerasus microcarpa Boiss , Rhamnus palaestinus Boiss. The bioclimatic analysis was carried out based on climatic data provided by Palestine Meteorological Department and according to the Rivas-Martinez bioclimatic system (Rivas- Martınez et al. 2011)  , which main aim was to study the relationship between the climate and the living species and their communities on the land in the world.
Idna (Idhna) is Palestinian village located to the north-west of the city of Hebron (13 kilometers west of Hebron) and in the southern West Bank, one of the territories occupied in 1967 and is located on the Green Line, an area now estimated at 17,000 hectares after it was 37,000 hectares in 1948, elevated about 450 - 500 m above sea level, between longitudes 34˚06' east and latitudes 31˚33' north. In the fact, we took one area is located at the east-south of Idna village that’s have three different names as Abu Salman Forest Reserve (elevation 450 - 545 m), Khallet Osman (elevation 440 - 540 m) and Hamra Aslimi (elevation 420 - 445 m) (Figure 1 and Figure 2).
3. Results and Discussion
In our study, the clustering analysis (Euclidean distance) applied to our data matrix of 48 rows (plants) and 17 columns yielded three clearly separated groups at the level of the truncation of (0.93). Group I (P1, P2, P5, P9, P11, P12, P14 and P16), Group II (P3, P4, P7, P8, P13 and P15) show the relives collected in Abu Salman Forest Reserve. Group III (P6, P10 and P17) gathers the relives corresponding to the forests of the Khallet Osman and Hamra Aslimi mountains (Figure 3). Both groups include plots located in the east-south of the Idna village and near of Suba.
However, when we applied of a principal component analysis (PCA) and covariance matrix obtained positive results, thereby confirming the existence of the
Figure 2. Idna location and green color represent a study area in the map.
Figure 3. Clustering agglomerative complete linkage.
three groups produced by the clustering analysis (Group I, Group II and Group III) (Figure 4).
Furthermore, the phytosociological analysis of the groups obtained with the previous multivariate analysis has allowed us to point out that the relives of Abu Salman Forest Reserve plots (P1, P2, P5, P9, P11, P12, P14, P16, P3, P4, P7, P8, P13 and P15) belong to the forest dominated by Pinus halepinsis Mill. recently described by Ighbareyeh J. M. H. et al. (2014)  , this is a pine-tree forest characterized at the Idna village flora elements such as: Quercus libani G. Olivier, Quercus caliprinos Webb., Ceratonia siliqua L., Alain together with the endemic species Quercus look Kotschy, Tamarix palaestina Bertol and Tamarix jordanis L. this forest develops in the infra-thermomediterranean dry bioclimatic belt and it is growing in Mediterranean maquis and forest   , with the terra rose and brown rendzinas territory, we proposed pine-tree forest (Abu Salman Forest Reserve), group I or association ASL 1: 1 - 16 Pino halepinsis-Quercetum lookii (Table 1).
Groups II include species collected in Abu Salman Forest Reserve, a relives 3 to 15 represents the infra-thermotropical forest, and dry-subhumid ombrotype (Annual ombrothermic index = 1.5 - 2.8   , which is 3.5 - 6 m high, with a 45% - 90% cover rate. This forest is characterized by the endemic trees Pyrus syriaca Boiss. Alain Pistacia palaestina Boiss., and growing in Mediterranean maquis and forest, therefore we proposed the association ASL 2 or Group II: 3 - 15 Pistacio paletinae-Ceratonietum siliquae (Table 2).
Figure 4. Cluster analysis for dry forest communities in the east south Idna-Hebron of Palestine.
Table 1. Pino halepinsis-Quercetum lookii.
Table 2. Pistacio palestinae-Ceratonietum siliquae.
Moreover, relives 6 to 17 including the Group III correspond to the forest of Pinus halepinus Mill.-Tamaricetum Palestineae. It is a tangled, plant forest 3.5 - 6 m high, with a 40% - 80% cover rate. This plants are characterized by Rubus idaeus L., Pinus halepensis Mill., Rhamnus punctata Boiss, Rhamnus lycioides Brot. & Rhamnus Palestaestina Boiss. and the local endemic plant Rhamnus Palestaestina Boiss. Echinops philistaeus Feinbrun & Zohary and Alain, we proposed Group III or association ASL3: 6 - 17 Quercus libanii-Tamaricetum Palestineae (Table 3).
In the other side, we include the forests growing in dry, sub-humid environments, it is probably necessary to create a new alliance to include all forests, and differences between the different associations proposed can be seen in the synthetic Table 4.
Finally, it is possible to say that Abu Salman Forest Reserve will be reduced to some plants or will be removed in the future due to the acceleration of construction (building houses and human activities), it is lies within the area classified B, this means that people can build houses and do their various activities, because it is located under Palestinian control, while the area C and D are located under Israeli control, don’t it permits to construct of building houses and any activities.
Climate change   , the growth of the population, the increase in the population density, and the occupation of the Palestinian territories occupied in 1967, including Abu Salman Forest Reserve and other Palestinian areas, will give us a serious indication of the loss of many endemic, semi-endemic and native plants in Palestine, thus eliminating a large part of the vegetation, flora and biodiversity in the future of Palestine.
Our study reveal that the 17 grids analyzed are clearly divided into three different groups, all of these groups represent the potential natural vegetation and with a very little substitution scrublands. The floristic analysis revealed that 20.83 % of these species are endemic especial in Abu Salman Forest Reserve. However, we indicated that the forests of Hebron as Idna village belong to different forests groups: Pine-tree forest as Pinus halepinus Mill., Arbutus andrachne L. and Cupressus arizonica L., Mediterranean maquis and forest as Quercus look Kotschy, Pistacia palestina L., Carob-lentisk maquis as Ceratonia siliqua L. and Pistacia lentiscus L., Everegreen oak maquis as Quercus caliprinos Webb, Rhamnus Palestaestina Boiss. and Rhamnus punctata Boiss., Deciduous oak forests as Pistacia palestina Boiss. and Pistacia saportae Burnat., and Reprian forests as Tamarix palaestina Bertoland Tamarix Jordani.
Associations described as new:
Pino halepinsis-Quercetum lookii*.
Pistacio paletinae-Ceratonietum siliquae*.
Quercus libanii-Tamaricetum palestineae*.
In the near area of Idna Village, associations described by Ighbareyeh J. M. H. et al., 2014  were followed:
Table 3. Quercus libanii-Tamaricetum palestineae.
N: native and E: endemic.
Table 4. Synthetic representation ASL4.
Percentage of plant species presence in the samples and communities: V = 100%, IV = 60.1% - 80%, III = 40.1% - 60%, II = 20.1% - 40% and I = 0.1% - 20%. N: Native and E: Endemic. Association (ASL), GI: Group one, G II: Group two, GIII: Group three, GI or ASL1: Pinus halepinus-Quercetum lookii., G2 or ASL2: Pistacio paletinae-Ceratonietum siliquae and G3 or ASL3: Quercus libanii-Tamaricetum palestineae.
Pistacio palaestinae-Quercetum lokii*.
Capparido sinaicae-Ceratonietum siliquae.
Cerasus microcarpae-Quercetum ithaburensis*.
Pyro siriacae-Abietetum cilicicae*.
Abio ciliciae-Ceratonietum siliquae.
Periploco aphylli-Pinetum halepensis.
Cytisopsis pseudocytiso-Tamaricetum tetragynae.
Crataego sinaicae-Tamaricetum jordanii.
*Associations in which olive cultivation is possible.