This paper provides new cytotaxonomic data on the genus Narcissus Linnaeus, 1753, in Algeria. Populations of seven taxa, N. tazetta Linnaeus, 1753, N. pachybolbus Durieu, 1847, N. papyraceus Ker Gawler, 1806, N. elegans (Haworth) Spach, 1846, N. serotinus sensu lato Linnaeus, 1753, including N. obsoletus (Haworth) Steudel, 1841, and N. cantabricus De Candolle, 1815, were karyologically investigated through chromosome counting and karyotype parameters. N. tazetta and N. elegans have the same number of chromosomes 2n = 2x = 20 with different karyotype formulas. Karyological and morphological characteristics, confirm the specific status of N. pachybolbus and N. papyraceus, both are diploids with 2n = 22 but differing in asymmetry indices. The morphotypes corresponding to N. serotinus sensu lato show two ploidy levels 2n = 4x = 20 and 2n = 6x = 30 characterized by a yellow corona. Some hexaploid cytotypes have more asymmetric karyotype with predominance of subtelocentric chromosomes. They are distinguished by orange corona and may correspond to N. obsoletus. Other cytotype 2n = 28 of N. serotinus was observed in the North Western biogeographic sectors. N. cantabricus was found to be diploid with 2n = 2x = 14, which is a new diploid report in the southernmost geographic range of this polyploid complex.

中文翻译：

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阿尔及利亚水仙属（石蒜科）的细胞分类学研究

 本文提供了有关阿尔及利亚水仙属林奈 (Narcissus Linnaeus, 1753) 的新细胞分类学数据。七个分类群的种群，N. tazetta Linnaeus, 1753, N. pachybolbus Durieu, 1847, N. papyraceus Ker Gawler, 1806, N. elegans (Haworth) Spach, 1846, N. serotinus sensu lato Linnaeus, 1753, 包括 N. obsoletus (Haworth) Steudel, 1841 和 N. cantabricus De Candolle, 1815 通过染色体计数和核型参数进行了核型研究。N. tazetta 和 N. elegans 具有相同数量的染色体 2n = 2x = 20 具有不同的核型公式。核型和形态学特征，证实了N. pachybolbus 和N. papyraceus 的具体状态，两者都是2n = 22 但不对称指数不同的二倍体。对应于 N 的形态类型。serotinus sensu lato 显示两个倍性水平 2n = 4x = 20 和 2n = 6x = 30，其特征是黄色冠。一些六倍体细胞型具有更多的不对称核型，其中以亚端着丝粒染色体为主。它们以橙色的日冕为特征，可能对应于 N. obsoletus。在西北生物地理区观察到其他细胞型 2n = 28 的 N. serotinus。N. cantabricus 被发现是二倍体，2n = 2x = 14，这是该多倍体复合体最南端地理范围内的新二倍体报告。