Revisiting the taxonomy of the genus Diplocentrum (Orchidaceae) with the proposal for reinstatement of D. longifolium

Mathew Jose Mathew; Jose Mathew; Salim Pichan Muhammed

doi:10.30550/j.lil/2147

Authors

Mathew Jose Mathew Joannah’s Orchids, Pettayil Heights, Thengakal, Vandiperiyar, Idukki -IN–685533, Kerala, India. https://orcid.org/0009-0009-8432-5796
Jose Mathew Department of Botany, Sanatana Dharma College, Alappuzha, IN-688003. University of Kerala, Karyavattom, Thiruvananthapuram, IN-695581, Kerala, India. https://orcid.org/0000-0002-4737-3459
Salim Pichan Muhammed MS Swaminathan Research Foundation, Puthoorvayal, Kalpatta, Wayanad, IN–673577, Kerala, India. https://orcid.org/0000-0001-8692-0884

DOI:

https://doi.org/10.30550/j.lil/2147

Keywords:

Aeridinae, endemism, Orchidaceae, South Western Ghats, taxonomy

Abstract

Morphotaxonomical studies have been conducted on the orchid genus Diplocentrum (Orchidaceae; Tribe: Vandeae; SubTribe: Aeridinae) endemic to peninsular India. A critical examination of type specimens and other materials of the genus, along with the specimens collected from Idukki and Wayanad districts of Kerala and Shevaroy Hills of Tamil Nadu, showed that Diplocentrum longifolium should be considered as a valid species. Thus, we therefore reinstate the independent status of D. longifolium. Furthermore, a lectotype is designated for D. congestum. To facilitate its identification in the field, we provide colour photographs, taxonomical keys, and notes on the distribution of the three species of the genus.

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