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A new species and two new combinations of Monolophus (Zingiberaceae) from Indo-Burma
expand article infoHong-Bo Ding§, Bin Yang|§, Mya Bhone Maw§, Pyae Pyae Win, Yun-Hong Tan§|
‡ Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences, Yunnan, China
§ Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Yunnan, China
| Core Botanical Gardens, Chinese Academy of Sciences, Yunnan, China
¶ Ministry of Environmental Conservation and Forestry, Yezin, Nay Pyi Taw, Myanmar
Open Access

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

Introduction

The genus Monolophus was first described by Wallich (1832) and included three species with references to earlier publications in 1820, 1829; and was recognised by Endlicher (1837), followed by Steudel (1841), Horaninov (1862), Pfeiffer (1874), Wu and Chen (1978). But for a very long time it was treated under Caulokaempferia K. Larsen (1964). Recently, the genus Monolophus was reinstated by Mood et al. (2014) with 22 new combinations. So far, the genus consists of 33 species (Larsen and Smith 1972; Larsen 1973, 2002; Larsen et al. 2004; Larsen and Jenjittikul 2004; Suksathan and Triboun 2004; Picheansoonthon and Mokkamul 2006; Ngamriabsakul 2008; Picheansoonthon et al. 2008; Picheansoonthon and Koonterm 2008; Tiyaworanant 2010; Chaturvedi et al. 2012; Roy and Barbhuiya 2013; Intharapichai et al. 2014; Mood et al. 2014; Phokham et al. 2015a, b; Sangnark et al. 2016; Veldkamp 2016; Bhaumik et al. 2017; Barbhuiya et al. 2018; Douangdeuane et al. 2019) from the Himalayas to South East Asia. There are two distinct groups, the yellow-flowered species (~28 taxa) that are distributed in Thailand and adjacent countries and the other non-yellow-flowered species (purple, red-purple, pink and white) (~5 taxa) which are localized in Eastern Himalaya (Bhaumik et al. 2017).

During our field work from May to June in 2018, some interesting specimens of Monolophus were found in Putao, Kachin state. Based on the detailed examination of the morphological characters of our material and morphologically similar species, we draw a conclusion that those specimens of Monolophus collected in Myanmar belong to a species new to science, Monolophus odontochilus Y.H.Tan & H.B.Ding, which is described here along with illustrations.

Material and methods

Measurements and morphological character assessments of the new species have been examined based on fresh materials and dried specimens. It has been compared with the morphologically similar species by affinities inferred using descriptions (Wallich 1820, 1832; Chaturvedi et al. 2012; Roy and Barbhuiya 2013) and type specimens in herbaria (K, L, E). Protologues and images of type specimens and dried herbarium specimens were gathered from JSTOR Global Plants (http://plants.jstor.org).

Taxonomic treatment

Monolophus odontochilus Y.H.Tan & H.B.Ding, sp. nov.

Figure 1

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).

Type

Myanmar. Kachin State: Putao District, Gathu Village. 27°29'07.23"N, 97°58'19.49"E, 643 m, 01 June 2018, Y.H.Tan, B.Yang, H.B.Ding, X.D.Zeng, M.B.Maw and H.L.Neing M3886 (holotype: HITBC!, isotypes: RAF!).

Description

Perennial herbs, rhizome short; pseudostem erect, leafy 50–70 cm long. Leaves 5–13, sub-sessile, elliptic to oblong, 10.2–14 × 3.0–5.0 cm, base cuneate, apex caudate to 2.0 cm long, margins entire, adaxial surface dark green, glabrous, abaxially light green, pubescent; ligule membranous, 6–8 mm long, hairy, apex unequally bilobed. Inflorescences terminal, 5–7 cm long, rachis glabrous; flowers white with yellow blotch at the base of the labellum; bracts 4–6, along rachis, distichous, oblong, 3.5–4.0 × 1.0–1.3 cm, greenish, outer surface pubescent, base truncate, apex cuspidate to 0.8 cm, 2-flowered; bracteoles membranous, lanceolate, ca. 1.5 × 0.8 cm, pubescent, rounded; calyx tubular, 1.3–1.4 × 0.3–0.4 cm, pubescent, greenish, split 6–7 mm down one side, apex acute; floral tube 4.3–4.5 cm, ca. 3.5 mm wide at mouth, white, glabrous; dorsal corolla lobe lanceolate, 2.2–2.3 × 0.6–0.7 cm, white, glabrous, hooded at apex, apical cusp ca. 2 mm long; lateral corolla lobes similar to dorsal lobe, narrower, 2.0–2.1 × 0.3–0.4 cm, hooded at apex, apical cusp ca. 1 mm long; lateral staminodes elliptic, 1.5–1.6 × 0.9–1.0 cm, white, apex rounded; labellum semi-orbicular, 4.4–4.8 × 3.2–3.6 cm, white with yellow spot at base, margin crenate; anther 4–5 mm long; anther crest flabellate, 2–3 × 4–5 mm, white, apex entire; stigma funnel-shaped, inserted between anther sac, margin raised on both ends, ciliate; ovary oblong, 3–4 mm long, pubescent, 3-locular.

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 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

Phenology

Flowering in May to June. Fruit not seen.

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.

Conservation status

This new species appears to be restricted to a very moist habitat in Gathu Village, Putao District, Kachin State, Northern Myanmar. According to our observations in the field, the two known populations are composed of about 50 mature individuals in each. Overall, however, the species has been deemed to be Data Deficient (DD) following IUCN Red list Categories and Criteria (IUCN 2017). Further field surveys in northern Myanmar are needed to gain more information on its distribution.

Affinities

Monolophus odontochilus is morphologically similar to M. linearis (Wall.) Wall. (Wallich 1820, 1832) in having white flowers with a yellow blotch at the base of the labellum. After comparison with specimens and descriptions in literature (Chaturvedi et al. 2012; Roy and Barbhuiya 2013), it was found that M. odontochilus can be distinguished from M. linearis, even on the basis of its vegetative characters: e.g. Monolophus odontochilus has unequally bilobed ligule (vs. entire ligule, respectively), longer calyx (1.3–1.4 cm vs. 0.8–0.9 cm, respectively), bigger lateral staminodes (1.5–1.6 × 0.9–1.0 cm vs. ca. 1.0 × 0.7 cm, respectively). Monolophus odontochilus, furthermore, differs in having elliptic to oblong leaves (10.2–14 × 3–5 cm), margin crenate labellum (non-trilobed) and purely white corolla. Monolophu linearis has linear lanceolate leaves (1.5–6.5 × 0.5–1 cm), trilobed labellum and pinkish white corolla. A diagnostic key to the new species of Monolophus and its closely related species is provided.

A diagnostic key to the non-yellow flowered of Monolophus is given below

1 Flowers completely pink 2
Flowers usually white, if corolla and lateral staminodes pink then labellum white 3
2 All leaves sessile, blade to 2.8 cm broad, ligule absent or indistinct M. suksathanii
At least upper leaves petiolate, blade 2.5–4 cm broad, ligule distinct M. secundus
3 Labellum completely white, without yellow blotch M. sikkimensis
Labellum white with yellow blotch 4
4 Corolla completely white M. odontochilus
Corolla pink to purple-pink 5
5 Leaf blades linear-lanceolate to lanceolate, labellum trilobed M. linearis
Leaf blades oblong to oblong-elliptic, labellum entire M. arunachalensis

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), 18°42'58.20"N, 102°22'20.94"E, 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, 18°25'59.82"N, 103°12'32.64"E, 200 m, 20 September 2014, CP200914-1 (holotype: BK, isotypes: MSU).

Acknowledgements

The authors are grateful to the Forest Research Institute of Myanmar for permission to conduct this study in the Northern Myanmar, and for their support and collaboration. We are grateful to Xiao-Dong Zeng, Kyaw Saw and Myint Zaw for their kind help in the fieldwork. This work was financially supported by a grant from National Natural Science Foundation of China (Grant no. 31970223) awarded to Yun-Hong Tan, by a project of the Lancang-Mekong Cooperation (LMC) Special Fund (Biodiversity Monitoring and Network Construction along Lancang-Mekong River Basin project), by the Southeast Asia biodiversity research institute, Chinese Academy of Sciences (Y4ZK111B01) and the CAS 135 program (No. 2017XTBG-F03).

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