Wednesday, August 19, 2020

[Botany • 2020] Dendrochilum ignisiflorum (Orchidaceae: Coelogyninae) • A New Species from Luzon Island, Philippines

Dendrochilum ignisiflorum M.N.Tamayo & R.Bustam.

in Tamayo, Pranada & Bustamante, 2020. 

Dendrochilum ignisiflorum is hereby described and illustrated as a new species of orchid endemic to Luzon Island, Philippines. The species resembles D. vanoverberghii by having petiolate leaves, channelled petioles, labellum of the same size, and the erect to suberect incurved column but distinct by the sub-globose or broadly ellipsoid pseudobulb, 3 distinct leaf veins, barely spreading flowers, lanceolate and revolute dorsal sepal, and the absence of callus in the labellum.

Keywords: Bokod, Malesia, Mt. Komkompol, sect. Acoridium, subg. Platyclinis, Monocots

FIGURE 2. Dendrochilum ignisiflorum M.N.Tamayo & R.Bustam., sp. nov. 
Flowers (A. Anterior view; A’. Anterior view (spread); A”. Lateral view); B. Flattened labellum; C. Lateral sepal; C’. Petal; C”. Dorsal sepal; D. Lateral view of column; E. Leaf; F. Plant habit; G. Bract.
 (All from M.N. Tamayo 0196). Illustration by M.N. Tamayo. 

FIGURE 1. Dendrochilum ignisiflorum M.N.Tamayo & R.Bustam., sp. nov.
 A. Habitat on the mossy forest summit of Mt. Komkompol, Bokod, Benguet (UARBRR); B. Leaf abaxial surface; C. Plant habit in situ; D. Closer view of the flower including the labellum and column; E. Pseudobulbs; F. Anterior view of the inflorescence; G. Lateral view of the inflorescence. 
Photos: A, C, by M.N. Tamayo; B, D-G by M.A.K. Pranada. (All from M.N. Tamayo 0196).

Dendrochilum ignisiflorum M.N.Tamayo & R.Bustam., sp. nov.
subg. Platyclinis 

Type:— PHILIPPINES. Luzon, Cordillera Administrative Region, Benguet Province, Municipality of Bokod, Mt. Komkompol (Upper Agno River Basin Resource Reserve: UARBRR) mossy forest, at ca. 2300 m elevation, 08 March 2020, M.N. Tamayo 0196 (Holotype: PNH!; Isotypes: NLUH!; PUH!). 

Diagnosis:— Dendrochilum ignisiflorum is most similar to D. vanoverberghii by having petiolate leaves, channelled petioles, labellum of the same size, and the erect to suberect incurved column. However, the new species is distinct by the sub-globose or broadly ellipsoid pseudobulb (vs. fusiform to ellipsoid), 3 distinct leaf veins (vs. 1 distinct), barely spreading flowers (vs. spreading), 1-veined sepal and petal (vs. 3-veined), lanceolate and revolute dorsal sepal (vs. oblong and spreading), yellow to bright orange labellum (vs. red), absence of callus (vs. present), broadly lunate sidelobes (vs. broadly and falcately oblong) and a 3-pronged midlobe (vs. transversely rectangular).

Etymology:—The epithet ‘ignisiflorum’ is a combination of the Latin words ignis (fire); flores (flowers). Hence, the name directly translates to ‘fire flowers’ as depicted by its barely spreading yellow to bright orange flowers.

 Distribution and Habitat:— Exposed ridges and mossy forest summit within the bounds of Mt. Komkompol (UARBRR), Municipality of Bokod, Benguet ca. 2300 m elevation.

Maverick N. Tamayo, Mc Andrew K. Pranada and Rene Alfred Anton Bustamante. 2020. Dendrochilum ignisiflorum (Coelogyninae, Arethuseae, Orchidaceae), A New Species from Luzon Island, Philippines. Phytotaxa. 455(4); 240–244. DOI: 10.11646/phytotaxa.455.4.1