New taxa and new records in Aspidistra (Convallariaceae s.s.) of Laos and Vietnam

This paper continues the publication of newly obtained results from a continuing taxonomic investigation of the genus Aspidistra in Laos and Vietnam. It includes illustrated diagnoses of two new species, A. melanaster Aver., K.S. Nguyen & Tillich, A. obliqua K.S. Nguyen & Aver., two new varieties, A. semiaperta Aver. & Tillich var. globulifera Aver., K.S. Nguyen & Tillich, A. lutea Tillich var. luteo-rubra K.S. Nguyen, Aver. & Tillich, and notes on two species, A. austroyunnanensis G.W. Hu, Lei Cai & Q.F. Wang and A. hekouensis H. Li, C.L. Long & Bogner newly recorded in the flora of Vietnam. Color illustrations, new or updated data on morphology, ecology, phenology, tentative relationships, distribution and conservation status are provided for all the mentioned taxa.     

Molecular characterization of Calocedrus rupestris Aver., H.T. Nguyen & L.K. Phan, 2008 (Cupressaceae) based on ITS1 partial sequence

Calocedrus rupestris Aver., H.T. Nguyen & L.K. Phan was described in 2008 based on some morphological characters that were not sufficiently significant to discriminate it as a species distinct from C. macrolepis Kurz. We applied a new approach to resolve these conflicting views by using sequence data from DNA (ITS) to elucidate phylogenetic relationships between the two species. Analyses of a partial ITS1 sequence in 5 individuals of 2 subpopulations of C. macrolepis and 18 individuals of 8 subpopulations of C. rupestris collected in Vietnam were done. Molecular characterization of the two species showed its low divergence with the lack of autapomorphic characters. In addition, the ITS1 partial sequences of some C. rupestris individuals were identical with C. macrolepis. Due to the less distinctive morphology between C. rupestris and C. macrolepis, the divergence between them does not exceed the interspecific levels, and therefore, C. rupestris could not be regarded as an independent species in relation to C. macrolepis but only as one of its varieties, C. macrolepis var. rupestris (Aver., H.T. Nguyen & L.K. Phan) L.K. Phan, Long K. Phan & Aver.     

931. RHODODENDRON SUOILENHENSE

A new species of Rhododendron, R. suoilenhense D.F. Chamberlain, Nguyen Thi Thanh Huong & Rushforth, is described from northern Vietnam and illustrated. Its discovery and distribution are noted. Suggestions for its cultivation are given.     

细口蜘蛛抱蛋，中国天门冬科一新记录种

报道了中国天门冬科蜘蛛抱蛋属一新记录种:细口蜘蛛抱蛋(Aspidistra semiaperta Aver. et Tillich),并提供特征描述及彩色图片。凭证标本存放于广西壮族自治区中国科学院广西植物研究所标本馆(IBK)。     

Pothos vietnamensis sp. nov. (Araceae–Pothoideae–Potheae) from Vietnam

Pothos vietnamensis V. D. Nguyen & P. C. Boyce is described and illustrated from northern Vietnam as a new species of the Pothos supergroup, and it is compared with the two most similar species: P. kerrii and P. pilulifer to which P. vietnamensis is comparable by having a very small fertile portion (< 5 mm diameter) on the spadix. Ecology, habitat, population size and conservation status are also discussed.     

Crataegus grossidentata sp. nov. (Rosaceae–Pyreae), a new hawthorn from northern Iran

Crataegus grossidentata Sharifnia & K. I. Chr., found in northern Iran, is described and illustrated as a species new to science. Its ecology, distribution and taxonomic relationships are discussed. A key to C. grossidentata and other one‐styled taxa of Crataegus occurring in Iran is provided.     

中国蜘蛛抱蛋属植物一新记录种——垂花蜘蛛抱蛋

报道了产自云南屏边的中国蜘蛛抱蛋属一新记录种——垂花蜘蛛抱蛋（Aspidistra nutans Aver.&Tillich）。该种是2017年发表的新种,采集于越南西北部地区,原文缺少果实描述,现补充描述该种果的形态特征。本种与辐花蜘蛛抱蛋（A.subrotata Y.Wan&C.C.Huang）在形态上相近,但其叶片中脉和侧脉明显突出,花梗近先端向下弯曲,长0.8~4.5 cm,花下垂,常贴生于地面,花被紫褐色,常平展,柱头纯白色（后者叶脉凹陷,花梗直立,长约5 mm,花斜向上开,花被暗紫色,内面具有小乳突,柱头白色带紫色斑点）而显著有别于后者。     

Hoya hanhiae sp. nov. (Apocynaceae,Asclepiadoideae) from central Vietnam

A new species, Hoya hanhiae V. T. Pham et Aver. discovered in central Vietnam is described, illustrated and compared with the related species H. macrophylla Bl. and H. verticillata (Vahl) G. Don.     

Ardisia banaensis and A. sadirioides spp. nov. (Myrsinaceae) from Vietnam

Two new species of Ardisia (Myrsinaceae), A. banaensis C. M. Hu & L. K. Phan and A. sadirioides C. M. Hu & L. K. Phan, from Vietnam are described and illustrated. Their distribution, habitat, phenology and closely related species are discussed.     

A new entomopathogenic nematode, <Emphasis Type="Italic">Steinernema robustispiculum</Emphasis> n. sp. (Rhabditida: Steinernematidae), from Chumomray National Park in Vietnam

Steinernemar robustispiculum n. sp. (Rhabditida: Steinernematidae) was isolated from woodland in Chumomray National Park, Sason, Sathay, Kontum, Vietnam. Its morphology, morphometrics, cross-hybridisation and the ITS-rDNA sequence analysis revealed that S. robustispiculum clearly differs from other known Steinernema spp. As in the cases of S. intermedium (Poinar, 1985), S. robustispiculum has very robust spicules, but it can be distinguished by the longer tail of the infective juvenile, lower E%, shorter spicules, the shape of the spicules, the number of genital papillae in the caudal region and the presence of a mucron on the male tail. S. robustispiculum has a lateral field resembling that of S. sangi Phan, Nguyen & Moens, 2001, but can be distinguished by a higher E%, higher D%, smaller length to width ratio of the spicules and the morphology of both the spicule head (manubrium) and the dorsal lobe of the spicule. The morphometrics of infective juveniles of S. robustispiculum are similar to those of S. monticolum Stock, Choo & Kaya, 1997; these species can be distingusihed by the position of the excretory pore, the smaller length to width ratio of the spicules, and the length and morphology of the spicule head (manubrium). The phylogenetic relationships within Steinernema Travassos, 1927, including the newly sequenced Vietnamese species S. robustispiculum n. sp., S. loci Phan, Nguyen & Moens, 2001, S. thanhi Phan, Nguyen & Moens, 2001 and S. sangi, are presented based on analyses of the ITS-rDNA. The ITS RFLP profiles obtained from 17 different restriction enzymes are also presented.     

Aspidistra albiflora sp. nov. (Asparagaceae) from southwestern Guangxi,China

Aspidistra albiflora C. R. Lin, W. B. Xu & Yan Liu (Asparagaceae) is described and illustrated as a new species from limestone areas in Guangxi, China. The new species is similar to A. cerina G. Z. Li & S. C. Tang, but differs in having the perianth white by the sides, white pistils, bracts longer than the perianth, anthers only 2 mm long, pistil obconical and stigma slightly enlarged, 4–5 mm in diameter. The new species is currently only known from the type locality in southwestern Guangxi, near the border to northern Vietnam.     

中国兰科一新记录属——拟线柱兰属

报道了中国广西西南部发现的兰科(Orchidaceae)新记录属——拟线柱兰属(Zeuxinella Aver.)。该属与线柱兰属(Zeuxine)相近,不同在于唇瓣先端3裂,唇盘上具4条肉质的垫状凸起,喙不裂。     

Maclurochloa trangdinhensis (Poaceae: Bambusoideae), a new species from northern Vietnam

A clambering bamboo endemic to northern Vietnam is shown to represent a new species, M. trangdinhensis H.N.Nguyen & V.T.Tran (Gramineae: Bambusoideae‐Bambusinae), which is described and illustrated. It is similar to M. tonkinensis in general appearance, but differs by being covered with appressed white hairs, and by auricles lacking or forming a low rim only, smaller leaf blade 20–24 × 2.3–2.5 cm, and smaller glumes 6–7 × 4.0–4.5 mm. A key to all species of the genus is included.     

Aspidistra longgangensis sp. nov. (Asparagaceae) from limestone areas in Guangxi,China

Aspidistra longgangensis C. R. Lin, Y. S. Huang & Yan Liu, a new species of Asparagaceae from the limestone areas in Guangxi, China, is described and illustrated. It is similar to A. guangxiensis S. C. Tang & Yan Liu in the shape of the flower, but differs by leaf blade pachyphyllous and bigger; the perianth lobes with appendages at base, appendage oblong, 3–5 mm long, apex incurved; stigma upper surface white, with 4(3) radial, bifurcate lines in the center. The new species is currently known only from Longgang National Natural Reserve, situated in southwestern Guangxi, China, near the border with northern Vietnam.     

Lysimachia vietnamensis and L. verbascifolia spp. nov. (Primulaceae) from Vietnam

Two new species of Lysimachia (Primulaceae), L. vietnamensis L. K. Phan & C. M. Hu and L. verbascifolia C. M. Hu & K. L. Phan from Vietnam are described and illustrated.     

广西植物名录补遗(Ⅷ)

该文报道了17个广西新记录物种，即柔毛阴山荠[Yinshania henryi(Oliv.) Y. H. Zhang]、臭荠(Lepidium didymum L.)、小酸模(Rumexa acetosella L.)、浙江凤仙花(Impatiens chekiangensis Y. L. Chen)、贵州海桐(Pittosporum kweichowense Gowda)、越南圆叶梭罗树(Reevesia orbicularis Tardieu)、冬青叶鼠刺(Itea ilicifolia Oliv.)、窄叶枇杷(Eriobotrya henryi Nakai)、瘤枝密花树[Myrsine verruculosa(C. Chen) Pipoly&C. Chen]、毛腺萼木(Mycetia hirta Hutch.)、二萼丰花草[Spermacoce exilis(L. O. Williams) C. D. Adams]、滇苦菜(Picris divaricata Vaniot)、纤细通泉草(Mazus gracilis Hemsl.)、皱叶荚蒾(Viburnum rhytid...     

Schizostachyum yalyense sp. nov. and S. ninhthuanense sp. nov. (Gramineae: Bambusoideae) from Vietnam

Two new species of Schizostachyum Nees (Poaceae: Bambusoideae): S. yalyense N. H. Xia, V. T. Tran et H. N. Nguyen and Schizostachyum ninhthuanense N. H. Xia, V. T. Tran et H. N. Nguyen (Poaceae: Bambusoideae) are described and illustrated from Vietnam. Schizostachyum yalyense is similar to S. lima (Blanco) Merrill, but differs by culm sheaths with a concave apex 4–5 cm wide and 1.0–1.5 cm deep, pseudospikelets clustered on the wholly leafless flowering branches, possession of 2 bracts and lodicules. Schizostachyum ninhthuanense is related to S. hainanense Merrill ex McClure, but differs by culm sheaths covered with white hairs and having white–brown hairs at the apex, ligule margin densely pale‐ciliate, pseudospikelets clustered on wholly leafless flowering branches, presence of 3 lodicules, two stigmas apically on the style and the third stigma branching off from one of the two other stigmas.     

中国蜘蛛抱蛋属一新记录种——两色蜘蛛抱蛋

报道了中国蜘蛛抱蛋属一新记录种———两色蜘蛛抱蛋。该种原产于越南,在中国为首次记录。本文对该种的特征进行了详细描述,尤其是对该种的花果期和果实的特征进行了重新描述和补充。凭证标本存放于广西植物研究所标本馆(IBK)。