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<p>The present study provides a detailed macro- and micro-morphological and anatomical description of seeds of 13 Cistaceae taxa (two <i>Fumana</i> and 11 <i>Helianthemum</i>), some of which are presented here for the first time (the near-endemic <i>H</i>. <i>crassifolium</i> subsp. <i>sphaerocalyx</i> and the rare <i>H</i>. <i>sancti-antoni</i>, <i>H. sessiliflorum</i>, <i>H</i>. <i>vesicarium</i>, and <i>Helianthemum virgatum</i> subsp. <i>ciliatum</i>). The seed shape, size, texture, hilum characteristics, epidermal cell patterns, anticlinal and periclinal cell walls, seed-coat ultrastructure, and the shape, thickness, and arrangement of different seed-coat layers were comparatively examined using light and scanning electron microscopy methods. The taxonomic significance of these characteristics is discussed, and a determination key using seed morphological and anatomical attributes is presented. Multivariate analyses of seed characters compared the previous and current sectional classifications of the two studied genera. Based on seed morphological and anatomical traits, our results support inclusion of <i>H. aegyptiacum</i> in sect. <i>Helianthemum.</i> This finding agrees with recent systematic treatments of the genus. Moreover, our results support the treatment of <i>H. sessiliflorum</i> as a distinct species, rather than a synonym of <i>H. lippii</i>.</p>

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Systematic implications of seed macro- and micro-morphology and seed-coat ultrastructure of the family Cistaceae in Egypt

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Sara Saleh,
  • Zeinab El-Karemy,
  • Mostafa Aboulela

摘要

The present study provides a detailed macro- and micro-morphological and anatomical description of seeds of 13 Cistaceae taxa (two Fumana and 11 Helianthemum), some of which are presented here for the first time (the near-endemic H. crassifolium subsp. sphaerocalyx and the rare H. sancti-antoni, H. sessiliflorum, H. vesicarium, and Helianthemum virgatum subsp. ciliatum). The seed shape, size, texture, hilum characteristics, epidermal cell patterns, anticlinal and periclinal cell walls, seed-coat ultrastructure, and the shape, thickness, and arrangement of different seed-coat layers were comparatively examined using light and scanning electron microscopy methods. The taxonomic significance of these characteristics is discussed, and a determination key using seed morphological and anatomical attributes is presented. Multivariate analyses of seed characters compared the previous and current sectional classifications of the two studied genera. Based on seed morphological and anatomical traits, our results support inclusion of H. aegyptiacum in sect. Helianthemum. This finding agrees with recent systematic treatments of the genus. Moreover, our results support the treatment of H. sessiliflorum as a distinct species, rather than a synonym of H. lippii.