![]() ![]() Recent molecular phylogenetic studies have shown that Hoya is paraphyletic without Absolmsia, Clemensiella, Madangia, and Micholitzia. In addition, the glabrescent leaves and stems of both H. yuennanensis are much higher, and those of H. gaoligongensis shows that the outer lobe process is only slightly higher than the inner process, while the corresponding parts of H. Although the corolla is similar in all three species, the relative positions of outer and inner corona lobe processes serve as a key character distinguishing these species. gaoligongensis has narrower long-oblanceolate leaves, much smaller lateral vein branch angles, and inconspicuous lateral veins. gaoligongensis to its close relatives, H. We further compare the primary diagnostic morphological characters of H. Tan (Apocynaceae, Asclepiadoideae), a new species native to mid-elevation moist evergreen broadleaved forests of Longling, Yunnan, SW China. We describe and illustrate Hoya gaoligongensis M.X. However, most of the study areas were exposed to extreme logging activities and had a high degree of human disturbances, indicating the need for intensive conservation efforts in this genus. Due to the high diversity recorded, the number of Hoya species in the country is expected to increase if the genus is explored continuously. The Sorenson similarity index is 6.74%, indicating a very low similarity of Hoya species between the studied sites. Both forests possess the richest in Hoya species, but with low dominance index. ![]() The most diverse forests are Sungai Rui and Lata Celak, having the Shannon index of 2.741 and 2.622, respectively. Further identification process together with molecular analysis of this plant is still ongoing. One unknown species was found and labelled as Hoya sp. The newly described species, Hoya peninsularis Rodda & Zakaria, was also reported in this study. A total of 27 species and one variety were recorded, out of which 15 species were newly reported for the northern region of Peninsular Malaysia. All living specimens found were recorded, and some species were cultivated for further identification and ex-situ conservation purposes. This extensive fieldwork was carried out from 2018 until the end of 2019 to provide a baseline checklist for this genus in this northern region. Seven locations were chosen between two states, Kedah (Lata Celak, Sedim, and Bukit Hijau) and Perak (Mahang, Belukar Semang, Sungai Rui, and Pondok Tanjung). This study provided data on the diversity of Hoya species reported to occur in some parts of the northern region of Peninsular Malaysia. wallichii in corolla colour (dark purple with a paler edge vs white-cream), corona lobe shape and surface (broadly elliptic, spreading and with a minute inner process, almost black with a velvety surface vs kidney-shaped, erect and with a well-developed acuminate inner process, purple with a shiny surface). tenebrosa are slender plants with ovate to oblong, thinly coriaceous glabrous leaves, slender peduncles with 1 or 2 flowers open at a time, and broadly campanulate corollas. undulata in lamina margin (flat vs undulate) shape of corona lobes outer processes (fan shaped vs elliptic), and in the pollinarium morphology (corpusculum larger than pollinia vs corpusculum smaller than pollinia). Hoya buntokensis is part of a group of four species that form specialised leaf structures harbouring ants (here defined as megadomatia), and it is most similar to H. wallichii from West Kalimantan, Hoya wallichii subsp. ![]() We describe a new Hoya species from Central Kalimantan, H.
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