Morphological description and detailed photographs of the new species are provided, accompanied by information on its ecology, provisional conservation status, and a taxonomic comparison with similar species. Platycentrum on the basis of actinomorphic androecium, apically rounded anthers and fruit with three unequal wings. Begonia xuansonensis is tentatively assigned to B. cathayana, differing in stipules 4-6 mm long, uniformly dark green adaxial side of leaf blade, abaxially densely red setose inner tepals of a staminate flower and three styles in a pistillate flower. The new species also shows similarity with B. lowiana, but differs from the latter by stipules 4-6 × 1.5-2 mm, orange tepals and ovary, and abaxially densely red setose inner tepals of staminate and pistillate flowers. Begonia xuansonensis is most similar to B. The new species is characterized by reddish-orange to orange tepals, which is a rare type of flower coloration in asian species of the genus. The present study showed that stem cutting appeared more feasible in propagating both Hoya species.īegonia xuansonensis, a new species from northern Vietnam, is described and illustrated. imperialis appearing to be more responsive towards these hormones in comparison to H. For micropropagation, callus induction was not promising and could only be observed at specific concentrations of both IBA and KN, with H. coronaria, significantly higher mean number of roots was achieved by treating with 1000 mg/L NAA (16.6 ± 1.4) or 2000 mg/L IBA (17.5 ± 2.7) compared with control. imperialis, when compared with control, the mean number of new leaves (6.3 ± 1.0) and the mean relative growth rate (RGR) based on stem diameter (0.004 ± 0.0007 cm cm−1 day−1) significantly increased when treated with 500 mg/L NAA and 2000 mg/L IBA, respectively. This present study shows that both Hoya species were successfully propagated by stem cutting even without hormone treatment. For micropropagation, Hoya leaf explants were cultured onto Murashige and Skoog (MS) agar media that were supplemented with IBA and/or kinetin (KN) (0–10.0 mg/L). Hoya stem cuttings were treated with either indole-3-butyric acid (IBA) or 1-naphthaleneacetic acid (NAA) (0–2000 mg/L), and then propagated onto a mixture of peat moss and perlite. Thus, the present study aimed to conduct a preliminary study of the feasibility of two alternative propagation methods, stem cutting and micropropagation, as a potential approach for their ex situ conservation. coronaria (Apocynaceae) are known to have ornamental value due to their beautiful flowers however, the feasibility of propagating these plants have not been reported despite the wild populations in Brunei Darussalam being highly threatened due to habitat loss and overcollection. in the sympodial branching, differing in being a much taller plant with shorter inflores-cence and larger fruits. chlorosticta Sands differing in the leaf shape, orientation and maculation, much fewer stamens, color of staminate tepals as well as shape of fruit wings. Pearce, but is sharply distinct by the leaf shape, tepal color, much fewer stamens and smaller pistillate tepals and fruits. Petermannia based on the cane-like habit, protogynous inflorescence and pistillate flowers with three locules each with two placentas. In this study we report the discovery of three undescribed species of Begonia, namely B. About 140 species of Begonia have been described from Borneo, 75 of which occur in Sarawak. Article PHYTOTAXA ISSN 1179-3155 (print edition) ISSN 1179-3163 (online edition) Abstract Borneo is a hotspot for Begonia.
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