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  热带亚热带植物学报  2020, Vol. 28 Issue (4): 421-424  DOI: 10.11926/jtsb.4215
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Cite this article as:  

童毅华, AVERYANOV Leonid, 阮氏青香, 等. 缅甸树萝卜和深裂树萝卜，老挝杜鹃花科植物二新记录种[J]. 热带亚热带植物学报, 2020, 28(4): 421-424. DOI: 10.11926/jtsb.4215.
TONG Yi-hua, AVERYANOV Leonid, NGUYEN Thi Thanh Huong, et al. Agapetes megacarpa W. W. Smith and A. lobbii C. B. Clarke (Ericaceae), Two New Records from Laos[J]. Journal of Tropical and Subtropical Botany, 2020, 28(4): 421-424. DOI: 10.11926/jtsb.4215.

Foundation item

This work was supported by the National Natural Science Foundation of China (Grant No. 31870180), and the Foundation of Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academyof Sciences (Grant no. Y821171001)

Corresponding author

XIA Nian-he, E-mail:nhxia@scbg.ac.cn

Biography

Tong Yi-hua, male, research in the taxonomy of Ericaceae.E-mail:yh-tong@scbg.ac.cn

Article history

Received: 2020-03-06
Accepted: 2020-04-04
Contents              Abstract              Full text              Figures/Tables              PDF
缅甸树萝卜和深裂树萝卜，老挝杜鹃花科植物二新记录种
童毅华1,2, AVERYANOVLeonid3, 阮氏青香4, 阮生康4, 何春梅5, 夏念和1,2     
1. 中国科学院华南植物园, 中国科学院植物资源保护与可持续利用重点实验室, 广州 510650;
2. 中国科学院核心植物园保护生物学中心, 广州 510650;
3. 俄罗斯科学院, 科马洛夫植物研究院, 圣彼得堡 197376;
4. 越南科学技术院生态与生物资源研究所, 河内;
5. 广东省林业科学研究院, 广东省森林培育与保护利用重点实验室, 广州 510520
摘要：报道了老挝杜鹃花科树萝卜属2新记录种：缅甸树萝卜（Agapetes megacarpa W.W.Smith）和深裂树萝卜（A.lobbii C.B.Clarke），前者分布于老挝琅勃拉邦省（Luang Prabang Province），后者分布于万象省（Vientiane Province），凭证标本保存在俄罗斯科马洛夫植物研究院标本馆（LE）。提供了每种的凭证标本、分布信息和彩色照片，分别利用繁殖器官性状和营养器官性状编制了老挝3种树萝卜属植物的检索表。
关键词：杜鹃花科    树萝卜属    新记录    老挝    植物多样性    
Agapetes megacarpa W. W. Smith and A. lobbii C. B. Clarke (Ericaceae), Two New Records from Laos
TONG Yi-hua1,2, AVERYANOV Leonid3, NGUYEN Thi Thanh Huong4, NGUYEN Khang Sinh4, HE Chun-mei5, XIA Nian-he1,2    
1. Key Laboratory of Plant Resources Conservation and Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;
2. Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Guangzhou 510650, China;
3. Komarov Botanical Institute of the Russian Academy of Sciences, St. Petersburg 197376, Russia;
4. Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, Hanoi, Vietnam;
5. Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization, Guangdong Academy of Forestry, Guangzhou 510520, China
Received: 2020-03-06; Accepted: 2020-04-04
Foundation item: This work was supported by the National Natural Science Foundation of China (Grant No. 31870180), and the Foundation of Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academyof Sciences (Grant no. Y821171001)
Biography: Tong Yi-hua, male, research in the taxonomy of Ericaceae.E-mail:yh-tong@scbg.ac.cn
Corresponding author: XIA Nian-he, E-mail:nhxia@scbg.ac.cn
Abstract: Two new records, Agapetes megacarpa W. W. Smith and A. lobbii C. B. Clarke (Ericaceae), were reported from Luang Prabang and Vientiane provinces of Laos, respectively. The vouchers were housed in Herbarium of the Komarov Botanical Institute (LE). The information of specimen, distribution and color photos for each species were provided, and two keys to all the three species reported in Laos based on fertile and sterile material are additionally given.
Key words: Ericaceae    Agapetes    New record    Laos    Plant diversity    

The genus Agapetes D. Don ex G. Don (Erica- ceae, Vaccinioideae) comprises ca. 100 species distri- buted from the Himalayan region through south China and Indochina to southeast Asia[1]. In Laos, only one species, i.e. Agapetes hosseana Diels, was recorded previously[2-4]. In the course of examining specimens of Agapetes collected from Laos housed in Herbarium of the Komarov Botanical Institute (LE), we found that except for A. hosseana, other two Agapetes species, i.e. A. megacarpa W. W. Smith and A. lobbii C. B. Clarke are also distributed in Laos, which represent new records for the flora of Laos. Thus, we reported the two new records here by providing the information of examined specimens and distribution and color photos for each species.

1 Agapetes megacarpa

W. W. Smith, Notes Roy. Bot. Gard. Edinburgh 11: 194. 1919; Airy Shaw, Kew Bull. 1958(3): 472. 1959; S. H. Huang in R. C. Fang, Fl. Reipubl. Popularis Sin. 57(3): 172. 1991; R. C. Fang & P. F. Stevens in Z. Y. Wu & P. H. Raven, Fl. China 14: 507. 2005; D. Banik & M. Sanjappa, J. Jap. Bot. 83: 100, f. 4. 2008; S. Watthana, Thai J. Bot. 4(1): 109. 2012; S. Watthana, Fl. Thailand 13: 109. 2015. Type: China, Yunnan, divide between Shweli-Salween, 2 133 m, April 1917, G. Forrest 13698 (holotype E!, isotype K!). Fig. 1: A–C; Fig. 2: A

Fig. 1 Agapetes megacarpa W. W. Smith (A, B, C) and A. lobbii C. B. Clarke (D, E). A: Habit; B: Inflorescence; C: Opened flower, show stamens and style; D: Flower front view, show corolla lobes; E: Part of inflorescence.
Fig. 2 Holotypes. A: Agapetes megacarpa (G. Forrest 13698, E); B: A. lobbii (left part) (T. Lobb s.n., E). (Downloaded from JSTOR website)

= Agapetes burmanica W. E. Evans, Notes Roy. Bot. Gard. Edinburgh 15: 199, t. 219. 1927; Airy Shaw, Bull. Misc. Inform. Kew 1935: 27. 1935, Kew Bull. 1948: 84. 1948, ibid. 1958(3): 470. 1959; S. H. Huang in R. C. Fang, Fl. Reipubl. Popularis Sin. 57(3): 174. t. 42: 1–4. 1991; R. C. Fang & P. F. Stevens in Z. Y. Wu & P. H. Raven, Fl. China 14: 507. 2005. Type: Myanmar, Kachin State, hills around Htawgaw, elev.2 133 m, September 1924, G. Forrest 24981 (holotype E!).

Specimens examined: Laos. Luang Prabang Province: Pon Xay District, Houay Man Village, Phou Tham Keo Mountain, around point 19°57ʹ44.2ʹʹ N, 102°25ʹ45.8ʹʹ E, elev. 500–650 m, 4 April 2017, L. Averyanov et al. LA-VN 2066 (LE, LE 01068352, LE 01073017-photo); Pon Xay District, between Houay Man and Nam Bo Villages, Phou Hua Ben Toc Mountain, around point 19°57ʹ33.1ʹʹ N, 102°25ʹ25.8ʹʹ E, elev. 500-650 m, 5 April 2017, L. Averyanov et al. LA-VN 2124 (LE, LE 01068354, LE 01073016- photo); Pon Xay District, along the way to Bane Phou Souong village, Pha Hiua Bin Toc Mountain, around point 19°57ʹ37.0ʹʹ N 102°25ʹ03.0ʹʹ E, elev. 600-850 m, 5 April 2017, L. Averyanov et al. LA-VN 2152 (LE, LE 01068353, LE 01073020-photos).

Distribution: China, Laos, Thailand, Myanmar and India[1, 4-7].

Notes: The type specimen of A. megacarpa was collected by G. Forrest in 1917 from Yunnan, China, only has fruits. He noted that the flower was creamy yellow with a question mark. However, the plants from Laos and other countries all have red to pinkish- red flowers[1, 5-7].

2 Agapetes lobbii

C. B. Clarke in Hook. f., Fl. Brit. India. 3: 448. 1881; Airy Shaw, Bull. Misc. Inform. Kew 1935: 37. 1935; Sleumer, Dansk Bot. Ark. 23(3): 303. 1966; S. H. Huang in R. C. Fang, Fl. Reipubl. Popularis Sin. 57(3): 170. 1991; R. C. Fang & P. F. Stevens in Z. Y. Wu & P. H. Raven, Fl. China. 14: 506. 2005; S. Watt- hana, Thai J. Bot. 4(1): 105. 2012; T. T. H. Nguyen et al., J. Trop. Subtrop. Bot. 22(2): 144, figs. 1-2, 2014; S. Watthana, Fl. Thailand 13: 105. 2015. Type: Myanmar. Mon State, Moulmein [Mawlamyine], Thoung-gyne, elev. 1 524 m, 1857, T. Lobb s.n. (holo- type K!, isotypes BM!, K!). Fig. 1: D-E; Fig. 2: B.

Specimens examined: Laos. Vientiane Province: Vang Vieng District, Nam Pe Village, about 12 km to the West of Vang Vieng Town, around point 18°58ʹ 41.0ʹʹ N, 102°18ʹ54.1ʹʹ E, elev. 500-1 000 m, 18 March 2013, N. T. Hiep et al. LA-VN 557a (LE, LE 01073015-photo).

Distribution: China, Laos, Vietnam, Thailand, Myanmar and India[1, 4-6, 8].

Notes: The specimen from Laos is nearly identical to the type specimens from Myanmar, except the pedicels which are a little shorter.

So far, there are a total of three species of Agapetes recorded in Laos. To identify them, two keys based on fertile and sterile material respectively were provided below.

Key to the species of Agapetes from Laos (based on fertile material)

1. Inflorescence racemose; pedicel shorter than inflorescence rachis; corolla half divided, lobes linear-triangular................. A. lobbii

1. Flowers solitary or fasciculate, or arranged into a corymbose- racemose inflorescence; pedicel longer than inflorescence rachis; corolla shortly divided, lobes triangular or narrowly triangular ................. 2

2. Flowers solitary or fasciculate with 2–4 flowers; corolla without transverse zig-zag bands; filaments much longer than anthers.................A. hosseana

2. Flowers arranged into a corymbose-racemose inflorescence; corolla with transverse zig-zag bands; filaments much shorter than anthers........................................................................................................................................................................... A. megacarpa

Key to the species of Agapetes from Laos (based on sterile material)

1. Stems up to 1 m long; young branches with dark brown setae, glabrescent; leaf blade shorter than 3.5 cm, apex retuse, obtuse or

mucronate.......................................................................................................................................................................... A. hosseana

1. Stems > 1 m long; branches glabrous; leaf blade longer than 4 cm, apex acute, shortly acuminate or caudate.................................... 2

2. Leaves usually pseudoverticillate; leaf blade lanceolate or oblong-lanceolate, base obtuse or rounded, apex acute or shortly

acuminate..................................................................................................................................................................... A. megacarpa

2. Leaves spirally alternate; leaf blade elliptic, elliptic-oblong to elliptic-lanceolate, base cuneate to attenuate or obtuse, apex

acuminate to caudate............................................................................................................................................................ A. lobbii

Acknowledgments We would like to thank the JSTOR web- site for supplying the type specimens of Agapetes megacarpa and A. lobbii.

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