中国棘豆属（豆科）一新记录种——平卧棘豆

平卧棘豆Oxrytropis prostrata（Pall．）DC主要分布于蒙古和俄罗斯,最近发现在中国的呼伦贝尔草原区也有分布,属于中国新记录种。该种主要特征为茎基部多分枝,托叶大部分与叶柄合生,密被白色柔毛,小叶先端钝圆或微凹,龙骨瓣先端喙长约2mm,子房和荚果光滑无毛。     

黄花棘豆化学成分及生物活性研究进展

黄花棘豆在我国西部地区分布广泛,是危害西部天然草地最为严重的毒草之一,其生物资源储量丰富,具有资源化开发利用的潜力.近40年来,国内外学者从黄花棘豆中发现了近300多个化合物,包括生物碱类、黄酮类和三萜皂苷类等类型.相关化合物在抗肿瘤、抗乙型肝炎病毒、杀虫、抑菌、抗缺氧等方面表现出一定的生物活性.本文从黄花棘豆的化学成...     

棘豆属一新变种

本文发表了棘豆属一新变种, 即白花长白棘豆Oxytropis anertii Nakai var.albiflora Zh.J.Zong et X.R.He var.nov.     

中国棘豆属新分类群

甘肃棘豆系新系Sect. Mesogaea Bunge Ser. Kansuenses C. W. Chang, ser. nov. Planta magna. Foliola 8—14—juga, 7—13 (—25) mm longa, 3—gmm lata. Racemus longus, densior; calyx tubulosus, 8—14mm longus;flos magnus, corolla 11—17mm longa, flava, carinae mucro c. 1mm longus. Typus nominis seriei:Oxytropis kansuensis Bunge Species 3 et Varietas unica, septentrionalis, boreali-occidentalis et australi-occidentalis Sinae incolae. 植株高。小叶8—14对,长7—13(—25)mm,宽3—9mm。总状花序长,花排列较密;花萼筒状,长8—14mm;花大,花冠长11—17mm,黄色,龙骨瓣的喙长约1mm。系名模式:甘肃棘豆Oxytropis kansuensis Bunge。本系有3种,1变种,分布于我国华北、西北和西南部。1.白花棘豆新变种     

镰形棘豆的一个新变型——白花镰形棘豆

描述了豆科棘豆属镰形棘豆(Oxytropis falcata Bunge)的一个新变型:白花镰形棘豆(Oxytropis falcataBunge form.atbiflora Y.H.Wu).原变型的花冠为蓝紫色或紫红色,而新变型花冠为白色.     

新疆棘豆属棘豆组的修订

通过对大量标本和文献的研究,并结合野外居群的观察分析,澄清了《中国植物志》棘豆组中存在的分类学问题,对新疆棘豆属棘豆组植物的分类进行修订,确认产于新疆的棘豆属棘豆组植物8种、1变型,并重新编制了新疆棘豆属棘豆组的分种检索表,以及各种的分类学处理及地理分布.研究结果表明:少花棘豆归并在宽瓣棘豆中,其中少花棘豆为新异名;冰河棘豆应改为球花棘豆;冰川棘豆的学名更正为Oxytropis proboscidea;将黑萼棘豆并入长茎棘豆组中.此外,棘豆组增加了3个类群:等瓣棘豆、伊朗棘豆和奇台棘豆,其中等瓣棘豆和伊朗棘豆为新疆新记录种,白花球花棘豆为新变型.     

棘豆属一新种

多年生草本, 近无茎, 全株被黄色长柔毛。托叶短, 与叶柄相贴, 卵状三角形, 合生。叶长4~6cm, 被黄色长柔毛。小叶对生4~6 对, 草质, 长2.5~3.5cm, 线形, 上面无毛, 下面具贴伏柔毛, 顶端急尖, 边缘反卷。总状花序近伞形, 具2~6 花, 花序柄与叶近等长。苞片卵形, 长2~3mm, 被白色柔毛。     

刺叶柄棘豆的一个新变型--白花刺叶柄棘豆

描述了棘豆属(豆科)刺叶柄棘豆(Oxytropis acipblla Ledeb．)的一个新变型：白花刺叶柄棘豆O．aciphylla Ledeb．f．albiflora Z．Y．Chang,Z．H．Wu et L．R．Xu。原变型的花冠为红紫色或蓝紫色,而新变型的花冠为白色。     

棘豆属分类学新资料

作者同意赵一之先生关于海拉尔棘豆Ｏ。ｈａｉｌａｒｅｎｓｉｓ Ｋｉｔａｇ。这是尖叶棘豆Ｏ。ｏｘｐｈｙｌｌａ ＤＣ的观点,但提出其变种光果尖叶棘豆的变种名应是Ｏ。ｏｘｙｐｈｙｌｌａ ＤＣ。ｖａｒ。ｐｓｉｌｏｃａｒｐａ Ｇ．Ｚ．Ｑｉａｎ。     

Metabolism of l-sparteine,dl-lupanine and l-thermopsine in species of Leguminosae

l-Sparteine-[¹⁴C], dl-lupanine-[¹⁴C] and l-thermopsine-[¹⁴C] fed to plants served as precursors to the more highly oxidized alkaloids. Radioactivity was also found in amino acids.     

Alkaloids of South African samples of Calpurnia aurea subsp. Sylvatica

Two new alkaloids, calpurmenine (12β,13α-dihydroxylupanine) and its 13α-pyrrolylcarboxylic acid ester have been isolated from a South African sample of Calpurnia aurea. The alkaloid 10,13-dihydroxylupanine, earlier found in Cadia purpurea but absent from Ethiopian material of Calpurnia aurea, was also identified.     

Use of the metabolic grid to explain the metabolism of quinolizidine alkaloids in Leguminosae

Evidence from feeding experiments with lysine-[2-¹⁴C] and from metabolism experiments published previously suggest the operation of a gridlike conversion of quinolizidine alkaloids in Leguminosae. Using these results and the taxonomical distribution of alkaloids a metabolic grid was devised to explain the conversion of lysine into lupin alkaloids and their interconversions.     

A phytochemical study of the quinolizidine alkaloids from Genista tenera by gas chromatography-mass spectrometry

Gas chromatography coupled with mass spectrometry has been used to analyse the alkaloids present in the aerial parts of Genista tenera. Anagyrine, cytisine, N-formylcytisine, N-methylcytisine and lupanine were the major compounds, the last two alkaloids being known for their hypoglycaemic activity. Dehydrocytisine, 5,6-dehydrolupanine, rhombifoline, aphylline and thermopsine were the minor alkaloids. The characterisation of the constituents was based on comparison of their Kovats retention indexes and electron impact-mass spectrometric data recorded on-line with those of reference compounds and literature data.     

Comparative biosynthesis of quinolizidine alkaloids from dl-lysine in five species of Leguminosae

Five species of the leguminosae produced radioactive lupine alkaloids after feeding with dl-lysine-[2-¹⁴C]. Saturated alkaloids and compounds with a pyridone ring were radioactive. The specific radioactivity of the isolated compounds provides evidence that conversion of lysine into the saturated alkaloids, and by further oxidation to compounds both with a pyridone ring and without a d ring.     

Alcaloides du Camoensia maxima

Three alkaloids, leontidine, camoensine and camoensidine, the two latter being new, have been extracted from Camoensia maxima. A partial synthesis