Abstract
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Taxonomic studies on Amomum Roxburgh s.l. (Zingiberaceae) in Myanmar II: one new species and five new records for the flora of Myanmar
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Abstract
In the course of a study of Amomum s.l. (Zingiberaceae) in Myanmar, Amomum schistocalyx Y.H. Tan & H.B. Ding, from Htamanti Wildlife Sanctuary, Sangaing Region of Northern Myanmar is described and illustrated as new to science here. Five taxa: A. yingjiangense S.Q. Tong & Y.M. Xia, A. carnosum V.P. Thomas & M. Sabu, A. tibeticum (T.L. Wu & S.J. Chen) X.E. Ye, L. Bai & N.H. Xia, Lanxangia scarlatina (H.T. Tsai & P.S. Chen) M.F. Newman & Škorničk, and Meistera yunnanensis (S.Q. Tong) Škorničk. & M.F. Newman, are newly recorded from Myanmar. The photographic illustrations, the distributions, and voucher specimens for each species are provided.
Introduction
Amomum s.l. (Roxburgh 1820: 75) is the second largest genus in the family Zingiberaceae with about 150–180 species (Xia et al. 2004; Thomas et al. 2016). It is distributed from the Himalayas throughout Southeast Asia to northern Australia and extends into the central Pacific (Tripathi and Prakash 1999; Xia et al. 2004; Kaewsri and Paisooksantivatana 2007), the centre of endemism being the forests of Southeast Asia (Droop and Newman 2014). Based on molecular phylogenetic analyses by De Boer et al. (2018), Amomum s.l. are now categorised into seven monophyletic genera, namely Amomum s.s., ConamomumRidley (1899: 121), MeisteraGiseke (1792: 205), WurfbainiaGiseke (1792: 206), Epiamomum A.D. Poulsen & Škorničková (De Boer et al. 2018: 22), Lanxangia M.F. Newman & Škorničková (De Boer et al. 2018: 23) and Sundamomum A.D. Poulsen & M.F. Newman (De Boer et al. 2018: 27).
According to this new treatment, the Myanmar species previously classified in Amomum s.l. are now categorised into three genera, namely Amomum s.s. (7 species: A. dealbatum Roxb., A. robertsonii Craib, A. sericeum Roxb., A. subulatum Roxb., A. erythranthum Y.H. Tan & H.B. Ding, A. ampliflorum Y.H. Tan & H.B. Ding, A. pauciflorum Baker), Meistera (2 species: M. aculeata (Roxb.) Škorničk. & M.F. Newman, M. koenigii (J.F.Gmel.) Škorničk. & M.F. Newman) and Wurfbainia (4 species: W. aromatica (Roxb.) Škorničk. & A.D. Poulsen, W. graminea (Wall. ex Baker) Škorničk. & A.D. Poulsen, W. villosa (Lour.) Škorničk. & A.D.Poulsen, W. microcarpa (C.F. Liang & D. Fang) Škorničk. & A.D. Poulsen) (Kress et al. 2003; De Boer et al. 2018; Ding et al. 2019). In the course of a study of Amomum s.l. (Zingiberaceae) in Myanmar, one new species, A. schistocalyx Y.H. Tan & H.B. Ding, is described and illustrated as new to science here. Five taxa: A. yingjiangense S.Q. Tong & Y.M. Xia, A. carnosum V.P. Thomas & M. Sabu, A. tibeticum (T.L. Wu & S.J. Chen) X.E. Ye, L. Bai & N.H. Xia, L. scarlatina (H.T. Tsai & P.S. Chen) M.F. Newman & Škorničk, and M. yunnanensis (S.Q. Tong) Škorničk. & M.F. Newman, are newly recorded from Myanmar here. As a result, the total number of Amomum s.l. recorded in Myanmar is presently raised to 19. The number of species occurring in Myanmar is still too small. Further extensive fieldwork would reveal much more species diversity of Myanmar Amomum s.l.
Taxonomic treatment
Amomum schistocalyx
Y.H.Tan & H.B.Ding sp. nov.
B965CE5D-2C44-55A5-95BA-FC97C011C98C
urn:lsid:ipni.org:names:77204200-1
Diagnosis.
Amomum schistocalyx Y.H. Tan & H.B. Ding is similar to A. putrescens D. Fang (1978: 51) in having lax inflorescence, similar yellow flowers, non-tubular bracteoles and green fruits, but can be distinguished by its leaves abaxially densely appressed silvery pubescent (vs. glabrous leaves), 2-cleft ligule (vs. entire ligule), non-tubular calyx (vs. tubular calyx), epigynous glands 2 mm (vs. 5 mm).
Type.
Myanmar. Sangaing Region, Hkamti District, near Htamanti village. 95°22'40.42"E, 25°22'32.40"N; 135 m elev., 3 June 2019, Y.H. Tan & H.B. Ding M5785 (holotype: HITBC!; isotypes: RAF!).
Description.
Clump-forming herb, 1.0–2.0 m tall. Pseudostem with 2–7 leaves per pseudostem, swollen at base, greenish yellow or brownish yellow; ligule ovate, 2-lobed to middle or bottom, 2.0–4.0 cm long, yellowish brown, membranous, fragile, pubescent, apex acute; petiole 2.0–7.0 cm; leaf blade adaxially green, abaxially silvery, elliptic to oblong-lanceolate, 17–50 × 6–10 cm, adaxially glabrous, abaxially densely appressed silvery pubescent, base attenuate, apex caudate. Inflorescence radical, 5.0–18.0 cm, arising from the rhizome, one inflorescences per pseudostem, peduncle 4.0–10.0 cm, reddish-brown, flowering part obpyramidal, 3.6–5.5 × 3.5–4.5 cm, lax with rachis visible between bracts, sterile bracts ovate, 1.6–2.7 × 1.5–2.0, yellowish brown, membranous; fertile bracts (bracteoles), non-tubular, lanceolate, 1.5–2.5 × 0.3–0.5 cm, yellowish brown, membranous, striate then soon rotting, subtending a single flower. Flowers 3.2–4.0 cm, yellow. Calyx non-tubular, split to bottom (even when flower budding), 1.0–1.5 × 0.3–0.6 cm, apex 3-toothed, membranous, yellowish brown, pubescent. Floral tube 1.0–1.2 cm long, ca. 0.4 cm wide at mouth, pale yellow, glabrous; dorsal corolla lobe oblong or ovate, 1.5–1.7 × 0.5–0.7 cm, brownish yellow and reddish towards apex, apex cucullate with a 1–2 mm long cusp, margin ciliate; lateral corolla lobes oblong, 1.5–1.7 × 0.4–0.5 cm, white towards base and brownish yellow at apex, apex rounded, margin ciliate. Labellum spreading, with red at claw, dull brownish yellow at middle and margin, obovate, entire, 1.9–2.3 × 1.0–1.2 cm, margin crisped, prominently veined, dentate, glabrous, adaxial surface pilose at base. Lateral staminodes lanceolate, adaxial surface red towards base and brownish yellow at apex, abaxial surface brownish yellow, 3–4 mm. Stamen 1.2–1.7 cm long, filament 0.4–0.7 × 0.2–0.3 cm, red at base, brownish yellow at apex, pubescent, connective pubescent, brownish yellow, anther thecae oblong, 0.7–0.9 cm long, creamy-white, dehiscing throughout their length, anther crest semi-lunar or inconspicuous trilobed, ca. 7 × 2 mm, brownish yellow, membranous, margin dentate. Epigynous glands two, oblate, ca. 2 × 1 mm, creamy, glabrous. Ovary ellipsoid, ca. 6 × 3 mm, villous; style ca. 2.7 cm long, puberulous; stigma cup-shaped, white, mouth ciliate. Infructescence up to 40 cm long, usually with 1–7 fruits reaching maturity. Capsule ovoid, 3.0–3.5 × 2.7–3.0 cm, 9-winged, green, at apex with persistent pubescent calyx, wings straight, stalk 5–7 mm.
Phenology.
Flowering maybe in April–June and fruiting in May–July.
Distribution.
Known only from the type locality, beside the Chindwin River, Hkamti District, Sangaing Region, Myanmar.
Ecology.
On the riverside at an elevation of 100–150 m in tropical forest.
Etymology.
The specific epithet ‘schistocalyx’ refers to the non-tubular, dehiscent calyx.
Conservation status.
LC. This species is locally common. Populations in Htamanti Wildlife Sanctuary are well protected. The populations near Htamanti village are not in a protected area but the populations are robust. So we treat this species as of Least Concern (IUCN 2017).
Affinities.
Amomum schistocalyx Y.H. Tan & H.B. Ding shares similar characters with A. putrescens but differs in many characters, such as leaves (abaxially densely appressed silvery pubescent vs. abaxially glabrous, respectively), ligule (2-cleft vs. entire, respectively), calyx (non-tubular vs. tubular, respectively), labellum (red at claw, dull brownish yellow at middle and margin vs. almost pure yellow, respectively), lateral staminodes (lanceolate, adaxial surface red towards base and brownish yellow at apex, abaxial surface brownish yellow vs. tooth like, red, respectively) and epigynous glands (2 mm vs. 5 mm, respectively).
Additional specimens examined (paratypes).
Myanmar. Sangaing Region, Hkamti District, Htamanti Wildlife Sanctuary, near Nam E Zu, Camp 1. 95°28'20.56"E, 25°32'13.42"N, 141 m elev., 20 May 2019, fruiting, B. Yang, H.B. Ding & X.D. Zeng M5158 (HITBC!; RAF!); Sangaing Region, Hkamti District, Htamanti Wildlife Sanctuary, near Nam E Zu, Camp 2. 95°31'34.08"E, 25°30'40.15"N, 143 m elev., 25 May 2019, fruiting, Y.H. Tan, M. Deng, B. Yang, H.B. Ding & X.D. Zeng M5374 (HITBC!; RAF!).
New records for Myanmar
Amomum yingjiangense
S.Q. Tong & Y.M. Xia
4AD199C5-05CF-5A7C-8A8B-CF9C67EBF8A1
Amomum yingjiangense S.Q. Tong & Y.M. Xia in Acta Bot. Yunnan. 10(2): 210. 1988; S.Q. Tong in C.Y. Wu (ed.), Fl. Yunnan. 8: 622. 1997; T.L. Wu & K. Larsen in C.Y. Wu & P.H. Raven (eds), Fl. China 24: 349. 2000; De Boer et al. in Taxon 67(1): 20. 2018. Type: China, Yunnan Province, Dehong Dai and Jingpo Autonomous Prefecture, Yingjiang County, Xima Town, Huoshigou Village, 1740 m elev., 8 August 1983, S.Q. Tong & C.J. Liao 24870 (holotype: HITBC081571!)
Description.
Clump-forming herb, 1–1.5 m tall, 3–7 pseudostems per clump. Pseudostem with 2–7 leaves per pseudostem, swollen and brownish yellow at base, greenish yellow towards apex; ligule ovate, entire, apex rounded, sometimes truncate or praemorse because of fragile, 5–13 mm long, densely brownish pubescent; petiole absent to 4 cm, densely brownish pubescent; leaf blade adaxially dark green, abaxially green, elliptic to narrowly elliptic, 35–65 × 5–11 cm, adaxially pubescent, abaxially densely brownish pubescent, base cuneate or attenuate, apex caudate. Inflorescence radical, 10–17 cm, arising from the rhizome, 1 inflorescences per pseudostem, peduncle short, 2–4 cm, reddish-brown, flowering part obovoid, ca. 11 × 10 cm, sterile bracts ovate, 2.5–5.5 × 2.0–4.5, reddish brown, carneous, fragile; bracteoles, non-tubular, lanceolate, 3.0–3.5 × 0.5–0.8 cm, reddish brown, carneous, fragile, subtending 1–2 flowers. Flowers 5–6 cm, white or pinkish orange. Calyx tubular, 2.3–3.0 × 0.5–0.9 cm, apex 3-toothed, membranous, white or pinkish orange, pubescent. Floral tube 2.3–2.7 cm long, ca. 0.5 cm wide at mouth, white or pinkish orange, pubescent; dorsal corolla lobe oblong, 2.2–2.5 × 0.8–1.0 cm, white or pinkish orange, hooded at apex, obtuse, ciliate; lateral corolla lobes oblong, 2.0–2.5 × 0.5–0.8 cm, white or pinkish orange, apex rounded, ciliate. Labellum spreading, obovate, white or pinkish orange with reddish stripe (by reddish dots) radiating towards apex, 2.5–3.0 × 1.5–2.0 cm, apex trilobed or inconspicuous trilobed, margin crisped or dentate, prominently veined, adaxial surface pilose at base. Lateral staminodes ovate, sometimes dentate, adaxial surface reddish, abaxial surface white or pinkish orange, 5–7 mm. Stamen 2.0–2.3 cm long, filament ca. 8 × 3 mm, white or pinkish orange, pubescent, connective pubescent, white or pinkish orange, anther thecae oblong, ca. 1.0 cm long, brownish yellow, dehiscing throughout their length, anther crest reniform or inconspicuous trilobed, ca. 7 × 3 mm, apex crenate or entire, white or pinkish orange, membranous. Epigynous glands 2, cylindrical, ca. 4 × 1 mm, creamy, glabrous. Ovary ellipsoid, ca. 5 × 3 mm, reddish brown, glabrous; style ca. 5.0 cm long, white, glabrous; stigma cup-shaped, reddish brown, mouth ciliate. Capsule not seen.
Specimens examined.
Myanmar, Kachin state, Putao district, Pannandin, top of mountain, understory herbs in tropical rain forest, 27°42'15.06"N, 97°52'57.88"E, 1769 m elev., flowering, 9 June 2018, Myanmar Exped. M4262 (HITBC!; RAF!).
Distribution.
China, Myanmar.
Note.
This species was originally described by Tong and Xia (1988) from fruiting material only and recorded as endemic to China (Tong 1997, Wu and Larsen 2000). In Ye (2018), he re-described the species with flowering material from the type locality. Here, we also provide a description from Myanmar.
Amomum carnosum
V.P. Thomas & M. Sabu
E2D72419-63A1-54C0-B1B6-8C4E1A5740A1
Amomum carnosum V.P. Thomas & M. Sabu in Kew Bull. 67: 549. 2012; De Boer et al. in Taxon 67(1): 19. 2018. Type: India, Nagaland, Tuensang Distr., Noklak, 20 May 2007, Thomas & Muhammed Nissar 103698 (holotype: CALI).
Specimens examined.
MYANMAR, Kachin state, Putao district, Upper Shankhaung to Wasandum, understory herbs in tropical rain forest, 27°27'15"N, 97°14'50"E, 1007 m elev., 17 June 2018, Myanmar Exped. M4626 (HITBC!; RAF!).
Distribution.
India, Myanmar.
Note.
Amomum carnosum was first described by Thomas et al. (2012) and recorded as endemic to Nagaland, India. The species is similar to A. maximum (Roxburgh 1810: 344) in having a bifid membranous ligule, white flowers, but differs in its diffuse, low stoloniferous herb, 30–45 cm tall, leaves 2–3 per shoot, 3-lobed labellum, lamina elliptic and glabrous. In our collection from Myanmar, Myanmar Exped. M4626 matches well with Thomas’s type in its morphological structure (Thomas et al. 2012). However, it differs in the slightly floral structure and having non-3-lobed labellum. Considering the floral structure of Amomum s.l. is easy to tear and corrupt in the rainy season, we consider that the accurate description of Amomum carnosum requires further observation and collection of field individuals.
Amomum tibeticum
(T.L. Wu & S.J. Chen) X.E. Ye, L. Bai & N.H. Xia
6DCEE892-E354-530C-9163-B7BD2A8D048C
Amomum tibeticum (T.L. Wu & S.J. Chen) X.E. Ye, L. Bai & N.H. Xia in Ye et al. Plant Syst. Evol. 304(9): 1174. 2018; –Hornstedtia tibetica T.L. Wu & S.J. Chen in Acta Phytotax. Sin. 16(3): 39. 1978; T.L. Wu & S.J. Chen, in T.L. Wu (ed.) Fl. Reipubl. Popularis Sin. 16(2): 136. 1981; T.L. Wu & K. Larsen, in C.Y. Wu & P.H. Raven (eds) Fl. China. 24: 358. 2000; –Hornstedtia arunachalensis S. Tripathi & V. Prakash, Nordic J. Bot. 19: 329. 1999. Lectotype (designated by Ye et al. 2018, pg. 1174): China. Xizang Province: Medog County, Beibeng Township (previously District), 810 m elev., 11 August 1974, Qingzang expedition 74-1913 (PE00075268).
Specimens examined.
Myanmar, Kachin state, Putao district, Upper Shankhaung to Wasandum, understory herbs in tropical rain forest, 27°27'15"N, 97°14'50"E, 992 m elev., 17 June 2018, Myanmar Exped. M4630 (HITBC!; RAF!); Kachin state, Putao district, Shinsanku, 27°39'56.90"N, 97°53'28.81"E, 990 m elev., 10 June 2018, Myanmar Exped. M4288 (HITBC!; RAF!); Kachin state, Putao district, Naung Maung township, Khasanku village, 27°39'35"N, 97°37'21"E, 1024 m elev., 13 June 2018, Myanmar Exped. M4457 (HITBC!; RAF!).
Distribution.
China, India (Ye et al. 2018), Myanmar.
Note.
This was originally described by Wu and Chen (1978) based on a collection from Medog County, Xizang (Tibet), China. It was placed in the genus Hornstedtia Retz., presumably due to the radical fusiform inflorescences covered with rigid involucral bracts enclosing oblong and smooth fruits, and pointed out that it was close to H. affinis Ridl. (Wu and Chen 1981). But on the basis of morphological study of flowering material originating at the type locality, the species is a member of Amomum s.s. (Ye et al. 2018).
Lanxangia scarlatina
(H.T. Tsai & P.S. Chen) M.F. Newman & Škorničk
8116083F-8E89-5274-8B02-E53DCF097A33
Lanxangia scarlatina (H.T. Tsai & P.S. Chen) M.F. Newman & Škorničk in De Boer et al. Taxon 67(1): 24. 2018; –Amomum scarlatinum H.T. Tsai & P.S. Chen in Acta Phytotax. Sin. 17(4): 90 1979; H.T. Tsai & P.S. Chen in T.L. Wu (ed.), Fl. Reipubl. Popularis Sin. 16(2): 121. 1981; S.Q. Tong in C.Y. Wu (ed.), Fl. Yunnan. 8: 639. 1997; T.L. Wu & K. Larsen in C.Y. Wu & P.H. Raven (eds), Fl. China 24: 350. 2000. Type: China, Yunnan Province, Xishuangbanna Dai Autonomous Prefecture, Jinghong City, Dadugang Township, Guanping forestry farm, 900 m elev., J.H. Zhang 18445 (holotype: HITBC048529!).
Specimens examined.
Myanmar, Kachin state, Putao district, around Gathu village, understory herbs in tropical rain forest, 27°28'17.39"N, 97°57'06.58"E, 575 m elev., 1 June 2018, Myanmar Exped. M3897 (HITBC!; RAF!); Kachin state, Putao district, from Gathu village to Tongwang Cave, understory herbs in tropical rain forest, 27°28'14.58"N, 97°57'01.01"E, 581 m elev., 3 June 2018, Myanmar Exped. M3995 (HITBC!; RAF!).
Distribution.
China, Myanmar.
Note.
This was originally described by Tsai and Chen (1979) based on a collection from Dadugang Township, Jinghong City, Yunnan Province, China. It was placed in the genus Amomum s.l., but on the basis of morphological study, the species is a member of Lanxangia (De Boer et al. 2018). It is a new generic record for the country.
Meistera yunnanensis
(S.Q. Tong) Škorničk. & M.F. Newman
4924C075-EF33-5529-82C9-9B4338642CF7
Meistera yunnanensis (S.Q. Tong) Škorničk. & M.F. Newman in De Boer et al. Taxon 67(1): 27. 2018; –Amomum yunnanense S.Q. Tong in Acta Bot. Yunnan. 12(2): 151. 1990; S.Q. Tong in C.Y. Wu (ed.), Fl. Yunnan. 8: 632. 1997; T.L. Wu & K. Larsen in C.Y. Wu & P.H. Raven (eds), Fl. China 24: 353. 2000. Type: China, Yunnan Province, Dehong Dai and Jingpo Autonomous Prefecture, Ruili county-level City, Mengxiu Township, Guangren, 1200 m elev., 25 July 1983, S.Q. Tong & C.J. Liao 24832 (holotype: KUN1219275).
Specimens examined.
Myanmar, Sangaing Region, Hkamti District, Htamanti Wildlife Sanctuary, near Nam E Zu Camp 2, 25°30'05.35"N, 95°32'41.50"E, 193 m elev., 27 May 2019, Myanmar Exped. M5515 (HITBC!; RAF!); Sangaing Region, Hkamti District, Homalin Township, just outside Htamanthi Wildlife Sanctuary, Nam Sa Bi Village Management Area, 25°18'53.50"N, 95°21'08.40"E, 216 m elev., 27 September 2016, Kate et al. 1631 (NY02654996!).
Distribution.
China, India, Myanmar.
Note.
This was originally described Tong (1990) based on a collection from Dehong Dai and Jingpo Autonomous Prefecture, Yunnan Province, China. It was placed in the genus Amomum s.l, but on the basis of morphological study, the species is a member of Meistera (De Boer et al. 2018).
Supplementary Material
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 Kyaw Saw and Myint Zaw for their kind help in 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), the Southeast Asia biodiversity research institute, Chinese Academy of Sciences (Y4ZK111B01) and the CAS 135 program (No. 2017XTBG-F03).
Funding Statement
the Lancang-Mekong Cooperation (LMC) Special Fund (Biodiversity Monitoring and Network Construction along Lancang-Mekong River Basin project), the Southeast Asia biodiversity research institute, Chinese Academy of Sciences (Y4ZK111B01) and the CAS 135 program (No. 2017XTBG-F03).
Notes
Citation
Ding H-B, Yang B, Maw MB, Win PP, Tan Y-H (2020) Taxonomic studies on Amomum Roxburgh s.l. (Zingiberaceae) in Myanmar II: one new species and five new records for the flora of Myanmar. In: Jin X-H, Xia N-H, Tan Y-H (Eds) Plant diversity of Southeast Asia-II. PhytoKeys 138: 139–153. https://doi.org/10.3897/phytokeys.138.38736
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To arrive at the top five similar articles we use a word-weighted algorithm to compare words from the Title and Abstract of each citation.
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Review