牟鳳娟　胡秀　馬士?！±钜还?/p>

Abstract：? To clarify the systematic relationship between Murraya kwangsiensis （C. C. Huang） C. C. Huang var. macrophylla C. C. Huang and M. kwangsiensis （C. C. Huang） C. C. Huang var. kwangsiensis （Rutaceae， Murraya） as well as its taxonomic status， several species of Murraya were studied on taxonomy， by the comprehensive research means， such as literature access， specimen identification， field surveys， cultivation observations and microanatomy experiments. The results indicate that M. kwangsiensis var. macrophylla is obviously different from M. kwangsiensis var. kwangsiensis on many morphological characteristics， such as leaves， flowers and fruits， therefore，? this taxon should be an independent species， and a new combination and rank Murraya macrophylla （C. C. Huang） F. J. Mou is proposed here; the morphological characteristics and the distribution of M. macrophylla are first described comprehensively; the pinnate leaves and leaflets of this species are the biggest in the genus Murraya， and it is more close to M. glabra （Guillaumin） Swingle endemic to Vietnam; many morphological characteristics， such as the largest leaflets， veins adaxially sunken and wrinkled leaflets， all make this species obviously different from other Murraya species. The taxon M. macrophylla is a independent species rather than a variety of M. kwangsiensis， and this new opinion about the systematic status of M. macrophylla is helpful to reconstruct the phylogenic relationship of the genus Murraya and to probe into the systematic relationship among species.

Key words： Murraya kwangsiensis， M. macrophylla， biological characteristics， new rank， new combination， Rutaceae

摘要：? 為理清蕓香科（Rutaceae）九里香屬（Murraya）中大葉九里香[M. kwangsiensis （C. C. Huang） C. C. Huang var. macrophylla C. C. Huang]與其原變種廣西九里香[M. kwangsiensis （C. C. Huang） C. C. Huang var. kwangsiensis]間的系統(tǒng)關(guān)系及其分類學(xué)地位，采用綜合文獻(xiàn)查閱、標(biāo)本鑒定、野外實地調(diào)查、栽培觀察及顯微解剖等多種方法對九里香屬植物數(shù)個種類進(jìn)行分類學(xué)相關(guān)研究。結(jié)果發(fā)現(xiàn)：大葉九里香在葉片、花、果實等形態(tài)特征方面與廣西九里香間的差異極大，故將其處理為一個獨立的種，并提出新等級組合Murraya macrophylla （C. C. Huang） F. J. Mou;首次對大葉九里香的形態(tài)特征及分布進(jìn)行詳盡描述;該物種的羽狀復(fù)葉及小葉均為九里香屬中最大者，更接近僅分布于越南的光葉九里香[M. glabra （Guillaumin） Swingle]，但其較大的小葉、葉面葉脈下凹且葉片皺縮等特征使其明顯不同于九里香屬其他種類。大葉九里香是一個獨立種而非廣西九里香的變種，此關(guān)于大葉九里香分類地位的新觀點有助于整個九里香屬的系統(tǒng)發(fā)育關(guān)系重建及種間系統(tǒng)關(guān)系的深入探索。

關(guān)鍵詞： 廣西九里香， 大葉九里香， 生物學(xué)特征， 新等級， 新組合， 蕓香科

Genus Murraya J. Koenig （under the name Murraea） was first published based on a single species， Murraea exotica L.， while Bergera L. was described based on B. koenigii J. Koenig （Linnaeus， 1771）. Later taxonomists unanimously treated Murraya and Bergera as congeneric， and Murraya has been conserved against Chalcas L.， though Chalcas was earlier published （Linnaeus， 1767）. Most species of Murraya distribute in South China and Indo-Malaysia， although some species can reach Sri Lanka， New Caledonia and Northeast Australia （Swingle， 1938; Swingle & Reece， 1967）. Tanaka （1929） recognized eight species and two varieties in the genus （under the name Chalcas）. The species of Murraya were classified into two or three groups， and eleven species and four varieties were re-cognized （Tanaka 1929; Swingle 1938; Swingle & Reece， 1967; But et al.， 1986）. Subsequent studies on Chinese materials led to the addition of one new species Murraya tetramera C. C. Huang （Huang， 1959）， one new combination M. kwangsiensis （C. C. Huang） C. C. Huang and one new variety M. kwangsiensis var. macrophylla C. C. Huang （Huang， 1978）. Nine species or one variety are endemic to China （Huang， 1997; Zhang et al.， 2010）. Considering the differences of chemical constituents between two sections of Murraya， M. kwangsiensis var. macrophylla was included into sect. Bergera， along with M. kwangsiensis var. kwangsiensis （But et al.， 1986）， otherwise， the former should belong to sect. Murraya as an independent species， based on the morphological cha-racteristics of the leaf epidermis of nine Chinese species of Murraya （Zou et al.， 1997， 1999）. At present， extremely limited findings are controversial concerning the taxonomic status and systematic position of this taxon.

The morphological descriptions of few morphological characteristics， only size of leaflet blades and fruit color are described after the publication of M. kwangsiensis var. macrophylla， and always is a variety of M. kwangsiensis （Huang， 1978， 1997; Zhang et al.， 2010）. Totally， there are ten specimens including type in three herbaria， namely IBK， GXMI and GXMG. Owing to lacking information， little is known about the taxon. For the above reasons， this taxon needs further studies on field researches and other experiments. During conducting the program “The taxonomic revision and systimatics of Murraya s. l.”， several populations of M. kwangsiensis var. macrophylla were only found in Guangxi.

1Materials and Methods

All specimens of Murraya kwangsiensis var. macrophylla and M. kwangsiensis var. kwangsiensis preserved in IBK， GXMI， GXMG， KUN， IBSC， SYS， PE and NAS were carefully studied for collecting information and many morphological characteristics. From 2016 to 2017， field researches such as morphological characte-ristics， growth state， population status and ecological condition were finished in Longzhou County， Daxin County and Napo County， Guangxi. For successively observing the biological and phenological characteristics of this species， a few plants from Napo and Daxin counties were transplanted in the greenhouse of Southwest Forestry University in 2016 and 2017 respectively.

During 2017-2018， flowering and fruiting were intensively investigated in cultivated environments; leaves， flowers and fruits are studied by microanatomy methods.

2Results and Analyses

2.1 Murraya macrophylla （C. C. Huang） F. J. Mou et D. X. Zhang comb. et stat. nov. （Plate I） 大葉九里香

Basionym： Murraya kwangsiensis （C. C. Huang） C. C. Huang var. macrophylla C. C. Huang， in Acta Phytotax. Sin. 16（2）： 85 （1978）.

Type： China， Guangxi， Daxin， （Z. J. Li 3198， Holotype： IBK！ barcode IBK00191042）.

Additional specimens examined： China， Longzhou， X. F. Deng 10571 （IBK）， H. Q. Li 40099 （IBK）; Daxin， F. J. Mou 618， 619 （SWFC）; Jingxi， Y. D. Peng 451025141014005LY （GXMG）; Napo， D. Fang et al. 0885 （GXMI）， D. Fang et al. 3-15482 （GXMI）， D. X. Nong et al. 451026130722029LY （GXMI， GXMG）， B. Y. Huang 451026141015067LY （GXMG）， X. Y. Huang 451026131127023LY （GXMG）， F. J. Mou 543， 550， 552， 624， 625 （SWFC）.

Shrub， high up to 2 m. Young branches， rachises， petioles and petals dispersed with very prominent oil glands. Compound leaves; rachises rather thin， about 12-30 cm long; leaflets 3-9， alternate; leaflet blades thick chartaceous，a few oil glands in the mesophyll; 7-20 cm×4-10 cm， slightly inequilateral and pointed at the base， abruptly acuminate at the tip， very slightly denticulate at the margin， with a oil gland at every tooth joint; glabrous， glossy and deep green upper， light yellow-green lower， brown when dried; lateral veins 6-9 pairs， sunken on upper surface， prominent on lower surface; petiolules cylindric， glabrous， 8-16 mm long; petioles cylindric， glabrous， prominently swollen at the base. Inflorescences terminal， cymes with a few small flowers， shorter than leaves; pedicels shorter than the flowers， with 2-4 small bracts at the base; flower buds broad ovate or oblong， 4 mm × 2.5 mm， yellow white， fragrant; calyx 4-connate， very shortly ciliate sepal with a big oil gland at the base; petals 4 mm × 1 mm， glabrous， oblong. Stamens 10， alternately shorter， 3 or 2 mm long; filaments constricted gradually upper 1/2 and pubescent above; anthers attached by the back， oval， with a few hairs; disk extremely short. Ovary cylindric， glabrous， with a few oil glands， distinctly constricted at about 1/3 from the apex; style longer than ovary， with very short hairs; stigma distinct. Berry oval， diameter 4-7 mm， smooth， with dense glands， red when ripe， containing 1-2-seed， mostly 1-seed. Flowering Jun.-Jul.; fruiting Aug.-Dec.

Distribution： China， Southwest Guangxi （Longzhou， Daxin， Jingxi， Napo）.

Habitat： Under forestry of limestone hill or valley forests， humid， shaded; alt. 550-1 400 m.

2.2 Recognition of the status of Murraya macrophylla

Species Murraya macrophylla shares few similarities of flowers with M. kwangsiensis， but both are so different in many morphological characteristics （Plate I; Table 1）. However， this taxon is more similar to M. glabra from?Vietnam on leaf morphological characteristics， but different in having less oil glands in the mesophyll， smaller cyme， less flowers and fruits. In a word， the taxon should be a species instead of a variety of M. kwangsiensis and placed under sect. Bergera based on the morphology.

3Discussion and? Conclusion

Since published， Murraya macrophylla is always treated as a variety of M. kwangsiensis （Huang， 1978， 1997; Zhang et al.， 2010）. According to the studies of specimens and field research， it is found that the roots， stems and mature branches of M. macrophylla are gray-brown instead of gray-white， the same as these of M. kwangsiensis， which is so different from description of Zou et al. （1997， 1999） and means that the taxon should be included into sect. Bergera instead of sect. Murraya. The species is more similar to M. glabra in the light of leaf morpho-logy and is more close to other species from Vietnam， namely M. glabra and M. stenocarpa instead of M. kwangsiensis， based on phylogeny of the genus Murraya from ITS and six cpDNA sequences （unpublished data）. All evidences suggest that M. macrophylla should be separated from M. kwangsiensis as an independent species， which is consistent with opinion of Zou et al. （1997， 1999）.

Key of four relative species of Murraya

1. Pinnately compound leaves.

2. Leaflets surface smooth; inflorescences pubescent; calyx 5-connateMurraya kwangsiensis

2. Leaflets surface uneven; inflorescences glabrous; calyx 4-connate.

3. Inflorescences terminal and lateral; petals 4; stamens 8; stigma slightly swollen， yellowM. glabra

3. Inflorescences terminal; petals 5; stamens 10; stigma indistinctM. macrophylla

1. Unifoliate compound leavesM. stenocarpaAcknowledgementsAll authors thanks for the help from these herbaria， IBK （Herbarium， Guangxi Institute of Botany）， GXMI （Herbarium， Guangxi Institute of Chinese Medicine & Pharmaceutical Science）， GXMG （Herbarium， Guangxi Medical Botanical Garden）， KUN （Herbarium， Kunming Institute of Botany， Chinese Academy of Sciences） and IBSC （Herbarium， South China Botanical Garden， CAS）， SYS （ Herbarium of Sun Yat-sen University）.

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（責(zé)任編輯 李莉）