The genus Thalictrum (Ranunculaceae), commonly known as meadow rue, comprises 200 species throughout the world and there are 25 taxa growing in India. While revising the genus in India, we came across a new species collected in Nainital in the Uttarakhand Himalaya. The new species, Thalictrum nainitalense, is differentiated from its closely allied species T. punduanum in its habitat preference for moist shaded stands in Rhododendron arboreum and Quercus oblongata forests, creamy-white flowers, the size of the sepals and stamens, and fusiform, stipitate, hairy achenes. A line drawing, colour plates and a key to the species found in the Uttarakhand Himalaya are provided to aid identification. The status of Thalictrum nainitalense as a species new to science is supported by morphological and molecular data.

中文翻译：

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Thalictrum nainitalense (毛茛科)，来自印度北阿坎德邦喜马拉雅山的新种

毛茛属（毛茛科），俗称草甸芸香，在世界范围内有 200 种，印度有 25 种分类群。在印度修改属时，我们遇到了在北阿坎德邦喜马拉雅山的奈尼塔尔收集的新物种。新物种 Thalictrum nainitalense 与其近缘物种 T. punduanum 的不同之处在于其栖息地偏爱于树木杜鹃和 Quercus oblongata 森林中潮湿的阴凉林、乳白色的花朵、萼片和雄蕊的大小以及梭形、有柄，多毛瘦果。提供了在北阿坎德邦喜马拉雅山发现的物种的线条图、色板和钥匙，以帮助识别。Thalictrum nainitalense 作为科学新物种的地位得到了形态学和分子数据的支持。