[Botany • 2022] Rediscovery of Diospyros bambuseti (Ebenaceae) in Thailand: Emended Taxonomic Description, Lectotypification, and Phylogenetic Placement

  Diospyros bambuseti H.R.Fletcher. 

in Duangjai, Sinbumroong, Chalermwong, et al., 2022. 

มะเกลืออรัญ, บูน || DOI: 10.11646/phytotaxa.542.3.3 

Photographed by S. Duangjai and A. Sinbumroong 

Abstract

Diospyros bambuseti is a rare species endemic to Thailand that was previously known only from type specimens. The only male specimens of this species were collected in 1930 from a bamboo forest in Aranya Prathet district, now Sa Kaeo Province, Thailand. Both male and female plants were rediscovered in Surat Thani Province, upper Peninsular Thailand during 2015–2020. In this work, we provide an emended description, detailed ecological data, photographs, and illustrations of recently collected specimens. We performed lectotypification and investigated the phylogenetic placement and sister taxa of D. bambuseti based on the DNA sequences of eight plastid regions. D. bambuseti is closely related to D. ehretioides, D. fasiculosa, and D. venosa. Finally, we provide a detailed morphological comparison of D. bambuseti with related species.

Keywords: Eudicots, Diospyros, molecular phylogenetics, morphology, plastid DNA, Thailand

  Diospyros bambuseti H.R.Fletcher. Male flowers.  

 Diospyros bambuseti H.R.Fletcher.  Female flowers.

 Diospyros bambuseti H.R.Fletcher. Young fruits. 

Diospyros bambuseti H.R.Fletcher. Fruits and seeds.   

  Diospyros bambuseti H.R.Fletcher.
A. Fruiting branch habit. B. Leaves. C. Male flowers. D. Male flowers. E. Fruits and seeds.

 Scale bars: A–B and E = 2 cm; C–D = 5 mm. 

Drawn by W. Bhuchaisri 

from Chalermwong 22102018 (A–B and E), Sinbumroong et al. 300520151 (C), and Sinbumroong 22052020 (E).

มะเกลืออรัญ Diospyros bambuseti H.R. Fletcher

Diospyros bambuseti H. R. Fletcher, Bull. Misc. Inform. Kew 1937: 387;

Fl. Siam. En. 2: 364. 1938; Phengklai Fl. Thailand 2 (4): 290, Fig. 1. 1981.

Vernacular name:— Maklua aran - มะเกลืออรัญ (Sa Kaeo); boon - บูน (Surat Thani).

Distribution:— Endemic to Thailand, known only from Aranya Prathet district, Sa Kaeo Province and Khian Sa district, Surat Thaini Province.

 

   

 

Sutee Duangjai, Aroon Sinbumroong, Porntawat Chalermwong, Padungsak Suekaew and Somran Sddee. 2022. Rediscovery of Diospyros bambuseti (Ebenaceae) in Thailand: Emended Taxonomic Description, Lectotypification, and Phylogenetic Placement. Phytotaxa. 542(3); 271–282. DOI: 10.11646/phytotaxa.542.3.3 

  facebook.com/PRHotNews02/posts/348019984036509

  facebook.com/groups/559072202038273/posts/669239241021568

[Botany • 2018] Diospyros phengklaii (Ebenaceae) มะพลับเพ็งคล้าย • A New Species from south-west Thailand

Diospyros phengklaii  Duangjai, Sinbumroong & Suddee

in Duangjai, Sinbumroong & Suddee. 2018.

มะพลับเพ็งคล้าย || DOI: 10.20531/tfb.2018.46.1.05

ABSTRACT

Diospyros phengklaii Duangjai, Sinbumroong & Suddee is described and illustrated. It is a species of tree only known from Bang Saphan District, Prachuap Khiri Khan Province, upper Peninsular Thailand. Phylogenetic evidence indicates that D. phengklaii is a distinct taxon and is a member of the Diospyros clade XI sensu Duangjai et al. (2009).

KEYWORDS:  Diospyros, morphology, new species, phylogenetics, Prachuap Khiri Khan, taxonomy

Figure 2. Diospyros phengklaii Duangjai, Sinbumroong & Suddee.
A. fruiting branchlet; B. stem & bark; C. leaves; D. flower bud of female flower; E–F. fruits. 

Photographs were taken by the second author on 10 October 2012 (B–F) and 25 March 2013 (A).

Diospyros phengklaii Duangjai, Sinbumroong & Suddee, sp. nov.

 Diospyros phengklaii resembles D. filipendula in the leaves with dense brown hairs, 4–5-merous flower with a salver-shaped corolla tube, and with long pedicel. It differs from that species by the bigger fruit, fruit narrowly cylindrical instead of ellipsoid, ovary (8–)10-locular rather than 4-locular.

....

Type: Thailand, Prachuap Khiri Khan, Bang Saphan, Thong Mongkhon, 25 Mar. 2013, Sinbumroong 56-2 (holotype BKF [213821], isotypes BK, BKF [213822, 213823, 213824], K). 

Vernacular.— Maphlap phengklai (มะพลับเพ็งคล้าย). 

Distribution.— Endemic to south-western Thailand, only known from Bang Saphan District, Prachuap Khiri Khan Province; may also be found in Myanmar. 

Ecology.— Tropical evergreen forest along stream; ca 200 m alt. 

Conservation status.— Endangered ENB1ab(iii) (IUCN, 2012). This species is currently known only from one locality with only 13 individuals found. The locality found is close to a village which is subject to human disturbance. 

Phenology.— Flowering and fruiting all year round. 

Etymology.— Named in honour of Dr Chamlong Phengklai, a senior botanist at the Forest Herbarium (BKF).

Sutee Duangjai, Aroon Sinbumroong and Somran Suddee. 2018. Diospyros phengklaii (Ebenaceae), A New Species from south-west Thailand. Thai Forest Bulletin (Botany). 46(1); 34-39.  DOI: 10.20531/tfb.2018.46.1.05