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Current Status of Tennessee Gladecress, Leavenworthia exigua var. lutea (Brassicaceae), in Alabama

机译:田纳西州GladeCress的现状,leadworthia exigua var。 卢其(Brassicaceae),在阿拉巴马州

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The late-winter ephemeral Leavenworthia exigua var. lutea (Tennessee Gladecress; Brassicaceae), has historically been known from moist limestone and dolomite cedar glades in Tennessee and Alabama. Until this study, its distribution included only 8 glades in 6 counties of the Valley and Ridge, Appalachian Plateau, and Interior Low Plateau physiographic provinces in Alabama. During early spring of 2017, 2018, and 2019, we examined 26 Alabama glades for the presence of this very rare taxon The historic populations in Jefferson and St. Clair counties of central Alabama have been extirpated by habitat destruction from urbanization. The population of L. exigua var. lutea reported from Colbert County (northwestern Alabama) could not be relocated, while that in Lawrence County (north-central Alabama) was found to be based on misidentified specimens of L. alabamica (Alabama Gladecress) with yellow flowers. This study documents 9 new records of L. exigua var. lutea in Shelby and Sumter counties, more than doubling the known populations in Alabama and extending its distribution into the Gulf Coastal Plain.
机译:晚冬季短暂的levornworthia exigua var。 Lutea(田纳西州GladeCress; Brassicaceae),历史上从田纳西州和阿拉巴马州的潮湿石灰石和白云岩雪松队闻名。直到本研究,它的分布仅包括在阿拉巴马州的6个县的谷和岭,阿巴拉契亚高原和内部低高原地理省份的8个县。 2018年初春季春季,2018年春季,我们审查了26岁的阿拉巴马州,在这个非常罕见的分类群体的情况下,杰斐逊和阿拉巴马州中部地区的历史悠久的人口都被城市化的栖息地破坏灭绝了。 L. exigua var的人口。从Colbert County(阿拉巴马州西北部)报道的Lutea无法搬迁,而在劳伦斯县(阿拉巴马州北部)是基于L.Alabamica(阿拉巴马州GladeCress)的误识性标本。本研究文件9 L. exigua var的新记录。 Lutea在Shelby和Sumter县,多于阿拉巴马州的已知人口倍增,并将其分布延伸到海湾沿海平原。

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