Abstract Mimosa, one of the most species-rich genera in the Leguminosae, exhibits a high diversity of trichomes. These structures are considered crucial to the taxonomy of the genus and are commonly used to delimit infrageneric groups. Barneby (1991) provided an important reference in the understanding of trichomes in Mimosa, but some terminology still needs to be clarified and standardized. The present study describes the microstructure and anatomy of trichomes in Mimosa and suggests a terminological standardization for these structures in the genus. We examined the trichomes of 62 species and the terms used to classify them were compared with previous taxonomic studies in the genus. We recognize 15 types of trichomes primarily based on the number, arrangement, and secretory activity of cells (uni- versus multicellular, uni- versus multiseriate, simple versus branched, glandular versus non-glandular). We conclude that the type of trichomes, rather than the type of indumentum, should be used for comparative analyses.

中文翻译：

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含羞草（豆科）毛状体：走向表征和术语标准化

摘要 含羞草是豆科中物种最丰富的属之一，具有高度多样性的毛状体。这些结构被认为对属的分类至关重要，通常用于划定属下群。Barneby (1991)为理解含羞草毛状体提供了重要参考，但仍有一些术语需要澄清和规范。本研究描述了含羞草毛状体的微观结构和解剖结构，并建议对该属中的这些结构进行术语标准化。我们检查了 62 个物种的毛状体，并将用于对它们进行分类的术语与该属的先前分类学研究进行了比较。我们主要根据细胞的数量、排列和分泌活动（单细胞与多细胞、单细胞与多细胞、简单与分枝，腺与非腺）。我们得出结论，应使用毛状体的类型而不是毛被的类型进行比较分析。