Petrosaviaceae, A New Familial Record of Angiosperm from Myanmar

Cite this article as:

金效华, 明璪. 无叶莲科, 缅甸被子植物一新记录科[J]. 热带亚热带植物学报, 2018, 26(6): 677-678. DOI: 10.11926/jtsb.3897. 复制到剪切板

JIN Xiao-hua, MINT Zaw. Petrosaviaceae, A New Familial Record of Angiosperm from Myanmar[J]. Journal of Tropical and Subtropical Botany, 2018, 26(6): 677-678. DOI: 10.11926/jtsb.3897. 复制到剪切板

Foundation item

This work was supported by grants from the Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences (Grant No. Y4ZK111B01), and the National Natural Science Foundation of China (Grant No. 31670194, 31620103902)

Corresponding author

JIN Xiao-hua, E-mail:xiaohuajin@ibcas.ac.cn

Article history

Received: 2018-02-28
Accepted: 2018-04-17

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无叶莲科, 缅甸被子植物一新记录科

金效华^1,2, 明璪³

1. 系统与进化植物学国家重点实验室, 中国科学院植物研究所, 北京 100093;
2. 中国科学院东南亚生物多样性研究中心, 叶津, 比都, 缅甸;
3. 白雪山国家公园管理局, 葡萄, 克钦邦, 缅甸

摘要：近期在缅甸北部进行野外植物考察中，发现了一种菌类寄生植物，疏花无叶莲（Petrosavia sakurai），是缅甸被子植物一新记录科和新记录目——无叶莲科和无叶莲目。对其进行了详细的报导，并提供特征描述等数据。疏花无叶莲主要特征为茎上的鳞片状叶较疏离且彼此相距1~2 cm、总状花序、花苞片稍短于花梗、花被约1/3贴生于子房上。

关键词：无叶莲属无叶莲科缅甸新记录

Petrosaviaceae, A New Familial Record of Angiosperm from Myanmar

JIN Xiao-hua^1,2, MINT Zaw³

1. State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
2. Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences, Yezin, Nay Pyi Taw 05282, Myanmar;
3. Hkakarborazi Natural Park, Putao, Kachin State, Myanmar

Received: 2018-02-28; Accepted: 2018-04-17

Foundation item: This work was supported by grants from the Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences (Grant No. Y4ZK111B01), and the National Natural Science Foundation of China (Grant No. 31670194, 31620103902)

Corresponding author: JIN Xiao-hua, E-mail:xiaohuajin@ibcas.ac.cn

Abstract: Petrosavia sakurai, a species representing a new familial and order record of flora of Myanmar, is described and illustrated. Peterosavaia is characterized by scalelike leaves on stem usually 1-2 cm apart, inflorescence a raceme, bracts slightly shorter than pedicel, and tepals adnate for ca. 1/3 its length to ovary.

Key words: Myanmar New record Petrosavia sakurai Petrosaviaceae

The monocot family Petrosaviaceae consists of approximate two genera and ca. four species, and is widespread in tropical and subtropical regions in Asia^[1-3]. Petrosaviaceae is characterized by achlorophyllous plants, reduced leaves scalelike, spiral along the stem, flowers white and actinomorphic, stamens 6, 3 carpels connate for 1/4-1/2 their length, fruit a capsule, follicle-like^[1-4].

During our botanical survey in northern Myanmar, Petrosavia sakura, a species representing a new familial and order record of flora of Myanmar (see references [5, 6]), was discovered and described below.

Petrosavia sakuraii (Makino) J. J. Sm. ex Steenis, Trop. Nat. 23: 52. 1934.

Miyoshia sakuraii Makino, Bot. Mag. (Tokyo) 17: 145. 1903.

Type: Japan. Mino, foot of Mt. Ena, shady forests, 27 Jul. 1903, H. Sakurai s.n (TI).

Mycoheterotrophic plants, herbs, whitish pale yellow, 7-15 cm tall, glabrous. Rhizome ca. 2 mm thick, enclosed by dense bracts. Stems slender, erect, 1 or 2 arising from rhizome. Leaves reduced and scale-like, rather lax, usually 1-2 cm apart, spiral along the stem, narrowly to broadly ovate, acuminate, 2-5 mm long, membranous, 1-veined. Inflorescence a raceme, more or less corymbose, 2-10 cm long, up to more than 10-flowered; bracts lanceolate to ovate, 2-5 mm, slightly shorter than pedicel. Pedicel 3-7 mm long. Flowers very small. Tepals (perianth) adnate for ca. 1/3 its length to ovary, persistent; outer segments triangular, inner segments ovate-deltoid; segments 1-veined, outer ones 0.8 mm×ca. 1 mm, inner ones 2 mm×ca. 2 mm. Stamens 6, ca. 1 mm long; anthers ovate. Ovary broadly ovoid, 3-partite. Capsule ca. 3 mm×3 mm. Fl. June-Aug., fr. Oct. 2n=60.

Habitat: Under humid montane evergreen broad- leaved forest, 2 200 m.

Distribution: China, Japan, and Myanmar (new record).

Flowering Period: June to Aug.

Specimens examined. Myanmar. Kachin State, Putao County, June 17, 2016, Ziyardam, Jin X. H., Wang R. J. & Chen Y. S. PT-2277 (PE).

Petrosavia sakuraii is a rare but widespread species in montane regions of subtropical and tropical Asia^{[1, 3]}. It is readily distinguished from its Asian relatives by scalelike leaves on stem usually 1-2 cm apart; inflorescence a raceme, more or less corymbose (Fig. 1), fertile bracts slightly shorter than pedicel, and tepals adnate for ca. 1/3 its length to ovary^{[1, 3, 7]}.

Fig. 1 Petrosavia sakuraii (Makino) J. J. Sm. ex Steenis (Photographed by Xiaohua JIN)

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