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| Monolophus odontochilus Y.H.Tan & H.B.Ding
in Ding, Yang, Maw, Win & Tan, 2020.
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Abstract
Monolophus odontochilus Y.H.Tan & H.B.Ding, a new species from Northern Myanmar, is described and illustrated. The new species is morphologically similar to M. linearis, but differs by having elliptic to oblong leaves (vs. linear-lanceolate to lanceolate), bilobed ligules (vs. entire), purely white corolla (vs. pinkish white), semi-orbicular crenate labellum (vs. trilobed). In addition, a diagnostic key to the new species of Monolophus and its closely related non-yellow flowered species is provided. New combinations are proposed here for Caulokaempferia phokhamii Picheans. & Douangde. and C. wongsuwaniae Picheans. & Douangde. from Laos.
Keywords: Caulokaempferia phokhamii, Caulokaempferia wongsuwaniae, Kachin State, Putao District
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| Figure 1. Monolophus odontochilus Y.H. Tan & H.B. Ding, sp. nov. A habitat B ligule C leaf blade abaxially D habit E single leaf (adaxially and abaxially) F flower (side view) G flower (front view) H anther with stigma and crest (front and back view) I stigma
Photographed by H.B.Ding
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| Figure 1. Monolophus odontochilus Y.H. Tan & H.B. Ding, sp. nov. F flower (side view) G flower (front view) H anther with stigma and crest (front and back view) I stigma J dorsal corolla lobe K lateral corolla lobes L bracts M bracteoles and young flower N calyx O ovary P labellum and floral tube Q lateral staminodes R stamen and stigma S ovary with style.
Photographed by H.B.Ding
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Monolophus odontochilus Y.H.Tan & H.B.Ding, sp. nov.
Diagnosis: Monolophus odontochilus is morphologically similar to M. linearis (Wall.) Wall. from India in having white flowers with yellow blotch at the base of the labellum, but differs by having elliptic to oblong leaves (vs. linear-lanceolate to lanceolate leaves), bilobed ligules (vs. entire ligules), semi-orbicular crenate labellum (vs. trilobed labellum) and purely white corolla (vs. pinkish white corolla).
Etymology: The species epithet ‘odontochilus’ refers to the crenate labellum.
Distribution and habitat: Monolophus odontochilus is endemic to Kachin State, Northern Myanmar, only known from its type locality, Gathu Village, Putao District. It grows in humid environments or along streams of tropical rain forest at an elevation of 550–750 m.
New combinations:
Mood et al. (2014) have argued that the generic name Caulokaempferia is a superfluous name of genus Monolophus. A proposal to conserve Caulokaempferia by Intharapichai et al. (2014) has not yet been considered by the appropriate committee. Therefore, in our opinion, Monolophus is valid and the name Caulokaempferia must be rejected. Recently, Douangdeuane et al. (2019) described two new species under Caulokaempferia from Laos, which are transferred here to Monolophus.
Monolophus phokhamii (Picheans. & Douangde.) Y.H.Tan & H.B.Ding, comb. nov.
Basionym: Caulokaempferia phokhamii Picheans. & Douangde. in Douangdeuane et al., Pak. J. Bot. 51(1): 235. 2019.
Type: Lao PDR. Vientiane Province, Hin Herb District, Phou Meut-Phou Kiykon Forest Conservation, Ban Hoiuy Dokmai (Hoiuy Dokmai Waterfall), ..., 270 m, 26 August 2014, CP260814-1 (holotype: BK, isotypes: MSU).
Monolophus wongsuwaniae (Picheans. & Douangde.) Y.H.Tan & H.B.Ding, comb. nov.
Basionym: Caulokaempferia wongsuwaniae Picheans. & Douangde. in Douangdeuane et al., Pak. J. Bot. 51(1): 237. 2019.
Type: Lao PDR. Bolikhamxai Province, Mueang Tha Pabad District, Nam Tok Tad Mangkorn, ..., 200 m, 20 September 2014, CP200914-1 (holotype: BK, isotypes: MSU).
Hong-Bo Ding, Bin Yang, Mya Bhone Maw, Pyae Pyae Win and Yun-Hong Tan. 2020. A New Species and Two New Combinations of Monolophus (Zingiberaceae) from Indo-Burma. In: Jin X-H, Xia N-H, Tan Y-H (Eds) Plant Diversity of Southeast Asia-II. PhytoKeys. 138; 155-162. DOI: 10.3897/phytokeys.138.39217
Bounleuane Douangdeuane, Boonmee Phokham, Pornpimon Wongsuwan and Chayan Picheansoonthon. 2019. The genus Caulokaempferia K. Larsen (Zingiberaceae) in Lao PDR part 1: Two new species from central Lao PDR. Pakistan Journal of Botany. 51(1); 235–240. DOI: 10.30848/PJB2019-1(23)
