唐松草属五新种

Five new species of Thalictrum (Ranunculaceae)from China

关键词:  毛茛科, 唐松草属, 新种, 中国

Key words:  Ranunculaceae, Thalictrum, new species, China

摘要:

该文描述了毛茛科唐松草属五新种:(1)小花唐松草,发现自贵州东北部,与多枝唐松草近缘,区别为其小叶较小,雄蕊较少,花丝较短,呈狭条形。(2)新宁唐松草,发现自湖南南部,与爪哇唐松草近缘,区别为本种的雄蕊花丝呈狭条状棒形,花只含3～6枚心皮。(3)短蕊唐松草,发现自河南东南部,在体态上与爪哇唐松草十分相似,区别为本种的雄蕊很短,花丝呈丝形,花只含4～6枚心皮。(4)毛蕊唐松草,发现自四川北部,与长柄唐松草有密切的亲缘关系,区别为本种的茎和花梗被短柔毛,萼片被缘毛,花药不具短尖头,子房密被短柔毛。(5)小金唐松草,发现自四川西部,与白茎唐松草在亲缘关系上甚为相近,区别为本种的小叶被微硬毛,雄蕊花丝呈狭条形,花药顶端无短尖头或具极小短尖头,心皮较小,长仅2.4 mm,柱头无翅。

Abstract:

Five species of the genus Thalictrum (Ranunculaceae)are described as new from China:(1)Thalictrum minutiflorum, described from north-eastern Guizhou Province, is related to T. ramosum Boivin, differing in its smaller leaflets, fewer stamens, and shorter narrowly linear filaments.(2)T. xinningense, described from southern Hunan Pro-vince, is related to T. javanicum Bl., differing from the latter in its narrowly linear-clavate filaments and its flower containing only 3-6 carples.(3)T. brachyandrum, described from south-eastern Henan Province, is in habit obviously similar to T. javanicum Bl., differing from the latter in its shorter stamens, filiform filaments, and flower containing only 4-6 carpels.(4)T. lasiogynum, described from northern Sichuan Province, is closely related to T. przewalskii Maxim., differing from the latter in its puberulous stem and pedicels, ciliate sepals, not mucronate anthers, and densely puberulous ovary.(5)T. xiaojinense, described from western Sichuan Province, is closely related to T. leuconotum Franch., differing from the latter in its hirtellous leaflets, narrowly linear stamen filanemts, not or minutely mucronate anthers, smaller carpels, and not winged stingmas.