Myrianthic acid: a triterpene acid from the rootwood of Myrianthus arboreus

Arjunolic acid and a new triterpene acid, myrianthic acid, were isolated from the rootwood of Myrianthus arboreus. The structures of the two compounds were elucidated by IR, ¹H NMR and mass spectroscopy.     

Study of the pollen emissions of Urticaceae, Plantaginaceae and Poaceae at five sites in western Spain

A comparative study is presented of the pollen emissions of Urticaceae, Plantaginaceae and Poaceae, collected during 1995 with Hirst samplers (Burkard or Lanzoni) at five sites in western Spain: two Mediterranean sites located in the south (Huelva and Seville) and three Atlantic sites in the north (Orense, Vigo and Santiago). The annual pollen of Poaceae and Plantaginaceae collected in the Atlantic cities was found to be twice that in the Mediterranean sites, and the total amount of Urticaceae was higher at sites with an urban environment and subject to sea influence (Vigo, Huelva and Seville). At all the sites, the start of the main pollination periods (MPP) took place in the following order: Urticaceae, Plantaginaceae and Poaceae. It was also observed that the MPP of these three pollen types began earlier in Huelva and Seville, where the mean temperatures necessary for the beginning of pollen emissions are recorded very early. Regarding the variation in pollen concentrations throughout the year, Urticaceae presented peaks of maximum concentration in March (Huelva, Seville, Vigo and Orense) and June (Santiago); Plantaginaceae in March (south) and June (north); and Poaceae in May (south) and June–July (north). At northern sites, pollen emissions of Urticaceae and Plantaginaceae continued throughout the summer, while in the south they decreased considerably from May onwards. From the allergenic point of view, the indices of reactivity described for Urticaceae and Poaceae were exceeded more often at northern sites, in particular at Vigo. The meteorological conditions associated with periods of highest pollen emission of these three herbaceous types are a rise in mean temperature, light or absent rainfall, and abundant sunshine. The statistical correlations between pollen emissions and meteorological factors were not well-defined, either for the stations or for all the taxa, although they were clearer for the Atlantic cities and for Urticaceae.     

荨麻科新分类群

一新种,曼耗楼梯草Elatostema manhaoense,和一新变种,洞头水麻Boehmeria macrophylla var.dongtouensis。     

Sphaerotylos C. J. Chen—A Remarkable New Genus of Urticaceae from China,with Notes on Stigmas of the Family

A new subtribe of the family Urticaceae, Sphaerotylinae C. J. Chen, a new genus, Sphaerotylos C. J. Chen and its type species S. medogensis C. J. Chen from south-eastern Xizang (Tibet) in China are described and illustrated. The subtribe is regarded as a primitive group in the tribe Boehmerieae. The ring-shaped stigma and the ball-like connective are the first discovery in the family Urticaceae. The types of the stigma of the family, their taxonomic significance and their evolution are also discussed in the present paper.     

都匀楼梯草 贵州荨麻科一新种

描述了在中国贵州发现的楼梯草属一新种:都匀楼梯草Elatostema duyunense W.T.Wang&Y.G.Wei,本种在亲缘关系上与上林楼梯草E.shanglinense W.T.Wang甚为相近,但根状茎细长,明显,茎较高,叶上面近牙齿顶端处被极短糙伏毛,托叶较大,条形或宽条形,有1条褐色脉,雄花序有短梗,花序托近圆形,明显,苞片6,其中2枚较大,卵状三角形,4枚较小,船状条形,小苞片无毛而与后者不同。     

31个楼梯草属(荨麻科)植物名称后选模式的指定

查阅保存于英国爱丁堡植物园标本馆(E)、华南植物园标本馆(IBSC)、邱园植物标本馆(K)、法国巴黎自然历史博物馆植物标本馆(P)和奥地利维也纳大学植物标本馆(WU)的荨麻科(Urticaceae)标本,发现在楼梯草属(Elatostema J.R.Forster & G.Forster)中有23种8变种的名称在原始描述中没有引证明确的标本,或引证有2份或2份以上的标本,但没指定模式.根据<国际植物命名法规>9.4、9.9和9.10,以及辅则9A.1、9A.2、9A.3和9A.4的精神,对这些名称做出后选模式指定.     

One New Series with Its Only New Species of Elatostema (Urticaceae) from Southeast Yunnan,China

One new series of sect. Weddelia in the genus Elatostema, named ser. Neriifolia, and with its only new species E.neriifolia from SE Yunnan are described and illustrated here. In addition, the morphological differences between these new taxa and their allies are disscussed and their conservation status is also assessed.     

云南高黎贡山荨麻科楼梯草属六新种

描述了云南高黎贡山荨麻科楼梯草属6新种：三茎楼梯草、少叶楼梯草、指序楼梯草、片马楼梯草、茨开楼梯草和拟宽叶楼梯草。     

越南冷水花属(荨麻科)一新记录种

报道了越南荨麻科(Urticaceae)冷水花属(Pilea Lindl.)一新记录种——基心叶冷水花(P.basicordata W.T.Wang ex C.J.Chen)。该种在越南Pu Hu自然保护区发现,与产自越南北部的P.balansae Gagnep.相似,主要区别在于其雄花序聚伞圆锥状,托叶大,叶先端渐尖或短尾状渐尖。     

西藏荨麻科二新种

描述了自西藏发现的荨麻科二新种：拉格艾麻（Laportea lageensis）和拉格冷水花（Pilea lageensis）,并给出了与其近缘种的区别特征。