<i>Helianthemum bilyanense</i> (<i>Cistaceae</i>), a new gypsum-halophytic specialist species from south-eastern Spain related to <i>H. polygonoides</i>
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A new species, <i>Helianthemum bilyanense</i> (sect. <i>Helianthemum</i>), is described from a single population in gypsum saltmarshes of inland Alicante province (Comunidad Valenciana), in the south-eastern part of the Iberian Peninsula. It is closely related to <i>H. polygonoides</i>, but several differences in its general habit, floral pieces and indumentum of stem, fruit and seed allow easy recognition. Data on morphology, ecology, distribution and conservation are reported for the new species, and its taxonomic affinities are discussed based on phylogenetic analyses of the internal transcribed spacer region of nuclear ribosomal DNA. Due to the scarce number of individuals, the reduced area of occupancy and the existence of serious threats on the only know population, <i>H. bilyanense</i> is suggested; (i) to be labelled as CR according to the IUCN red list categories and (ii) to be included in the Spanish and the Valencian catalogues of threatened plant species as ‘threatened with extinction’.
<i>比利安半日花（Helianthemum bilyanense）</i>（隶属于<i>半日花组（sect. Helianthemum）</i>）为一新发现物种，仅分布于伊比利亚半岛东南部西班牙阿利坎特内陆省（巴伦西亚自治区）的石膏盐沼生境中，目前仅发现一个种群。该新种与<i>多形半日花（H. polygonoides）</i>亲缘关系密切，但其在整体生长习性、花部结构以及茎、果实和种子的毛被特征上存在多处显著差异，易于识别区分。本研究报道了该新种的形态学、生态学、分布及保育相关数据，并基于核糖体核DNA内转录间隔区（internal transcribed spacer, ITS）的系统发育分析，探讨了其分类学亲缘关系。鉴于该物种仅存种群的个体数量稀少、占有面积狭小，且面临多重严重威胁，建议将<i>比利安半日花（Helianthemum bilyanense）</i>按照国际自然保护联盟红色名录（IUCN Red List）的分类标准评定为极危（CR）等级，并将其纳入西班牙及巴伦西亚自治区濒危植物物种名录，标注为“濒临灭绝”。
