金喜楼梯草(荨麻科)，越南楼梯草属植物一新种

DO Van Truong 林 云 TRAN Ngoc Hai 韦毅刚

(1.越南国家自然博物馆，维管束植物分类与多样性保育中心，河内 100803； 2.湖南省医药技工学校，湖南食品药品职业学院，长沙 410208； 3.越南国家林业大学，河内 100803； 4.广西壮族自治区中国科学院广西植物研究所，广西喀斯特植物保育与恢复生态学重点实验室，桂林 541006)

金喜楼梯草(荨麻科)，越南楼梯草属植物一新种

DO Van Truong1林 云2TRAN Ngoc Hai3韦毅刚4*

(1.越南国家自然博物馆，维管束植物分类与多样性保育中心，河内 100803；2.湖南省医药技工学校，湖南食品药品职业学院，长沙 410208；3.越南国家林业大学，河内 100803；4.广西壮族自治区中国科学院广西植物研究所，广西喀斯特植物保育与恢复生态学重点实验室，桂林 541006)

对产自越南的荨麻科楼梯草属植物一新种金喜楼梯草(ElatostemakimhyenseY.G.Wei & V.T.Do)作了描述和绘图。该种生长于海拔350～400和1 100～1 200 m的石灰岩山地林下。该新种与越南楼梯草(E.vietnamenseQ.Lin & L.D.Duan)接近，区别在于其拥有肉质茎，羽状脉，叶背面、苞片和小苞片被微硬毛。

楼梯草属；分类学；荨麻科；越南

The genusElatostemaJ. R. Forster & G. Forster is the largest genus in the family Urticaceae, consists of ca. 500 species and is distributed in tropical and subtropical regions of Africa, Asia, and Oceania. Of which, 34 species and one variety are found in Vietnam[1～13].

While studying onElatostemafor the flora of China, we also examined theElatostemaspecimens from the related herbaria in Vietnam, and additional field work were carried out in Vietnam as well. During an expedition at Kim Hy Nature Reserve, Na Ry District, Bac Can Province, North Vietnam, a previously unknown species was collected in dark damp forests on limestone hills at 350-400 m alt., latitude 22°11′56″ N, longitude 106°4′5″ E. After collecting again from the same locality, critical examination to the specimens and carefully consulting relevant literatures, it was identified as a new species. Actually, the specimens of this species were collected many years ago and has been still kept at VNMN and MO herbaria. However, they have not yet been reported and published as a new one to science. Thus, it is described, illustrated and photographed herein as a new species.

ElatostemakimhyenseY.G.Wei & V.T.Do, sp. nov.(Fig.1-2)

Elatostemakimhyenseis most similar toE.vietnamenseQ.Lin & L.D.Duan, but differs from the latter by carnose stems, penninerved leaves, abaxial leaf surface hirtellous, hirtellous bracts and bracteoles.

Fig.1 E.kimhyense Y.G.Wei & V.T.Do, sp. nov.(Y.G.Wei & V.T.Do V-23,PE) A. Habit; B. Male inflorescence; C. Part of adaxial leaf surface(cystoliths); D. Part of abaxial leaf surface(densely hirtellous, petiole and stipule)(Drawn by W.H. Lin from the holotype)

Fig.2 E.kimhyense sp. nov. A. Habitat; B. Male inflorescence(photographed by Y.G.Wei)

Herbs perennial, tufted, monoecious, 20-60 cm tall. Stems carnose, terete, ascending or decumbent, simple, glabrous. Leaves alternate; stipules linear-lanceolate or subulate, 2-4 mm long, caduceus; petiole 1.5-5.0 mm long; leaf blade papyraceous after drying, obliquely oblanceolate or obliquely obovate-elliptic, 5-11 cm long, 2-3 cm wide, major basal lateral veins absent and venation pinnate, abaxial leaf surface densely hirtellous, adaxial leaf surface glabrous, base cuneate, margin crenate, apex acuminate; cystoliths conspicuous, linear, 0.4-0.6 mm long, dense, random adaxial surface, obscure abaxial surface; nanophylls absent. Male and female inflorescences borne on male and female stems respectively, or male inflorescences borne towards the stem apex and female inflorescences borne towards the stem base. Male inflorescences axillary, solitary, simple, nearly globate, 0.8-1.2 cm in diam.; peduncle 1.5-3 mm long; receptacle very small; bracts 6, hirtellous, connate, unequal, 2 outer ones cymbiform-ovate or ovate, 6-10 mm long, 4-5 mm wide, 4 inner ones broadly lanceolate, 4-5 mm long, 2-3 mm wide; bracteoles narrowly ovate or lanceolate, dense hirtellous, 3-4 mm long; male flowers 7-12, white, 5-merous. Young female inflorescences axillary, solitary, simple, nearly globate, 2-3 mm in diam.; sessile; receptacle very small. Achenes unknown. Flowering from November to December, fruiting from January to February.

Vietnam. Bac Can Province: Na Ry District, Kim Hy National Park, latitude 22°11′56″ N, longitude 106°4′5″ E, 350-400 m alt., on rocks or between rock crevices in dark damp forests on limestone hills, 2 Dec. 2010, Y.G.Wei & V.T.Do V-23 (holotype: PE, isotypes: IBK, VNMN, PE); 21 Jun. 2012, L.F. Fu, F. Wen & V.T. Do VMN_CN 194 (paratypes: IBK, VNMN); Ha Giang Province: Quan Ba District, Bat Dai Son Nature Reserve, latitude 23°09′ N, longitude 104°59′ E, 1 100-1 200 m alt., in primary forest on limestone, N.T. Hiep & L.V. Averyanov 5120 (paratypes: MO).

This species is a member ofElatostemasectionWeddelia(H. Schroeter) W.T.Wang based on penninerved leaf blade, capitate male and female inflorescences with obscure small receptacles[13]. It is most morphologically similar toE.vietnamenseQ.Lin & L.D.Duan[9]based on leaf blades obliquely obovate-elliptic, base cuneate, margin crenate, apex acuminate; male bracts 6, connate, unequal, the 2 outer ones large, the 4 inner ones small. However it differs from the latter in stems carnose (vs. subshrubs); abaxial leaf surface densely hirtellous (vs. glabrous); major basal lateral veins absent and venation pinnate (vs. the pair of major basal lateral veins asymmetric, 1 basal, the other arising above base); bracts and bracteoles hirtellous (vs. glabrous). More detailed morphological differences between two species are given in Table 1.

Table1ComparisonofmorphologicalcharacteristicsofE.kimhyenseandE.vietnamense

CharactersE．kimhyenseE．vietnamenseHabitCarnoseherbsSubshrubsStemAscendingordecumbent，simpleErect，branchedLeafbladePapyraceous，obliquelyoblaceolateorobliquelyobovate⁃elliptic，5-11cmlong，2-3cmwide，penninerved，ab⁃axialsurfacedenselyhirtellousChartaceousorpapyraceous，obliquelylongellipticorobliquelyobovate⁃elliptic，6-15cmlong，2-6cmwide，semitriplin⁃erved，glabrousMaleinflorescencePeduncle1．5-3mmlong，maleflowers5⁃merousPeduncle2-9mm，maleflowers4⁃mer⁃ous

AcknowledgmentsWe would like to thank the staffs at Kim Hy Nature Reserve for their assistance during the field work and Mr. Wen-Hong Lin for the line drawing.

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National Natural Science Foundation of China “Inverstigation and taxonomic revision of Elatostema in South China”(31160039);“Studies on reproduction mode of Elatostema (Urticaceae) from China”(31570307)

introduction：DO Van Truong(1984—),male,Ph.D,mainly focusing on Flora of Vietnam and taxonomy.

date:2017-01-06

Elatostemakimhyense(Urticaceae),ANewSpeciesfromVietnam

DO Van Truong1LIN Yun2TRAN Ngoc Hai3WEI Yi-Gang4*

(1.Vietnam National Museum of Nature,Vietnam Academy of Science and Technology,Department of Biology,Hanoi 100803；2.Hunan Medication Vestibule School,Hunan Food and Drug Vocational College,Changsha 410208；3.Vietnam National University of Forestry,Hanoi 100803；4.Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain,Guangxi Institute of Botany,Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences,Guilin 541006)

A new species ofElatostema(Urticaceae), namelyElatostemakimhyenseY.G.Wei & V.T.Do, was described and illustrated.E.kimhyensewas found out in forests on limestone hills at 350-1 200 m asl.. The new species is related toE.vietnamenseQ.Lin & L.D.Duan, but differs from the latter by carnose stems, penninerved leaves, abaxial leaf surface hirtellous, hirtellous bracts and bracteoles.

Elatostema;Taxonomy;Urticaceae;Vietnam

国家自然科学基金“华南楼梯草属(荨麻科)调查与分类学修订”(31160039)；“中国楼梯草属(荨麻科)生殖途径研究”(31570307)

DO Van Truong(1984—)，男，博士，主要从事越南区系和植物分类学相关工作。

* 通信作者：E-mail:weiyigang@aliyun.com

2017-01-06

* Corresponding author：E-mail:weiyigang@aliyun.com

Q949.737.5

A

10.7525/j.issn.1673-5102.2017.03.001