Taxonomic notes on Dendrobium sect. Pedilonum (Orchidaceae): a new species, D. nakhonsiense from Thailand and the D. cumulatum s.l. complex revisited
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Issued Date
2026-03-13
Resource Type
ISSN
11793155
eISSN
11793163
Scopus ID
2-s2.0-105033034730
Journal Title
Phytotaxa
Volume
747
Issue
1
Start Page
81
End Page
94
Rights Holder(s)
SCOPUS
Bibliographic Citation
Phytotaxa Vol.747 No.1 (2026) , 81-94
Suggested Citation
Rujichaipimon W., Pedersen H., Suddee S., Traiperm P. Taxonomic notes on Dendrobium sect. Pedilonum (Orchidaceae): a new species, D. nakhonsiense from Thailand and the D. cumulatum s.l. complex revisited. Phytotaxa Vol.747 No.1 (2026) , 81-94. 94. doi:10.11646/phytotaxa.747.1.5 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/115835
Title
Taxonomic notes on Dendrobium sect. Pedilonum (Orchidaceae): a new species, D. nakhonsiense from Thailand and the D. cumulatum s.l. complex revisited
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Corresponding Author(s)
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Abstract
This study presents a classical taxonomic approach to parts of Dendrobium sect. Pedilonum, focusing on a newly discovered species from Thailand and the D. cumulatum s.l. species complex. The new species, D. nakhonsiense seems endemic to Nakhon Si Thammarat Province in Peninsular Thailand where it is only known from one location. It is morphologically close to D. cowenii but is distinguished by its slightly larger flowers with a relatively longer, obtuse to rounded mentum and by its differently shaped dorsal sepal and labellum lamina. The D. cumulatum s.l. complex includes four taxa, viz. D. cumulatum, D. rhodocentrum, D. eoum, and D. calicopis. Based on extensive herbarium studies and morphological comparisons, we propose the recognition of two distinct species: D. cumulatum (syn.: D. rhodocentrum, D. calicopis) and D. eoum. Our findings contribute to the understanding of species diversity and distribution within Dendrobium sect. Pedilonum.