Buletin Kebun Raya

5-14

Authors: Wiguna Rahman

Red listing is a critical point in implementing conservation strategy of Indonesian Rhododendron spp. Some problems might be encountered during the process. Firstly, many of Indonesian Rhododendron species are on data deficient status, especially for non-Java species. Secondly, the existence of unstable species list that contains species names only known from few specimens. Thirdly, the legality of the conservation status for natural hybrids. Thus, promoting their natural habitat conservation and make them as monitoring remote areas for botanic gardens would be an important part of the conservation strategy.

25-32

Authors: Decky Indrawan Junaedi

Research on vegetation characteristics and vegetation community similarities was conducted in Mount Ciremai National Park. Three vegetation communities found in the southern part of this National Park, i.e. Parigi-Paguyangan Badak-Acip area (PPA), Karamat Purnajiwa area (KP) and Karamat Sanghiang area (KS), Kuningan, West Java, were investigated. Quadrant method with 10 observation plots per ha was used for vegetation analysis whereas the Jaccard and Sorensen similarity indices were used to evaluate community similarities among the three locations. Vegetation community in PPA (1.100 — 1.580 m asl) was highly dominated by Castanopsis argentea (saninten). This was quite different with the vegetation communities of KP and KS (1.000 — 1.200 m asl) that were dominated by Horsfieldia glabra (kalapa ciung) and several other co-dominant species, such as Sterculia sp., Ficus benjamina and Ficus glabella. Further analysis using Jaccard Similarity Index (lsj) showed that the vegetation communities of KP and KS had a relatively high similarity.

46-50

Authors: Nina Dwi Yulia

A study on the diversity of epiphytic orchids in the natural forest at the Village Petarikan, District Kotawaringin Barat, Central Kalimantan was carried out. All routes in the area of study were investigated. The number of epiphytic orchids found was 32 genera, consisting of 99 species. The most common species were those of genera Bulbophyllum and Dendrobium. Some of them were endemic to Kalimantan, i.e. Dendrobium nabawanense, Bulbophyllum beccarii, Dendrochilum oxylobum, Liparis lobongensis and Porpax borneensis. These orchids were frequently found on Saraca declinata, Dipterocarpus sp. and Durio zibethinus.