Abstract In Brazil, the genus Calliandra Benth. (Caesalpinioideae; Leguminosae) comprises 74 species, of which 59 are endemic; the north-eastern region stands out as its largest dispersal centre. Calliandra species display a pollen dispersal unit (polyad) formed by eight calymmate, ellipsoid pollen grains, with a uniplanar arrangement and bilateral symmetry. Pollen units of native and ornamental Calliandra species present in north-eastern Brazil were analysed to provide subsidies for studies on the ecology and taxonomy of the genus. Pollen morphometric data of 25 species and two varieties were used to characterise the genus into different Calliandra sections. The pollen material analysed was acetolysed, then measured, described, and photomicrographed under light microscopy (LM). Quantitative data were submitted to descriptive statistical treatments. In the Calliandra sect. Androcallis and C. sect. Monticola, polyads tended to be larger in length and width than those in the C. sect. Microcallis. In the C. sect. Monticola, an appendage was present in the most acute region of the apical pollen grain. Quantitative data showed that the largest polyad occurred in C. macrocalyx var. macrocalyx, with dimensions of 250 µm × 150 µm, and the smallest polyad occurred in C. leptopoda, with 117.5 µm × 65 µm. Based on the data obtained for polyad length, it was possible to differentiate the species into distinct groups within and between sections studied.

中文翻译：

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Calliandra Benth 属的 Androcallis、Microcallis 和 Monticola 部分的孢粉学特征。（豆科 - Mimosoid Clade）存在于巴西东北部

摘要在巴西，Calliandra Benth 属。（Caesalpinioideae；豆科）包括 74 种，其中 59 种是地方性的；东北地区是其最大的分散中心。Calliandra 物种显示由八个萼状体、椭圆形花粉粒形成的花粉散布单元（polyad），具有单平面排列和双侧对称性。分析了存在于巴西东北部的本地和观赏 Calliandra 物种的花粉单位，以为该属的生态学和分类学研究提供补贴。使用 25 个物种和两个变种的花粉形态学数据将该属表征为不同的 Calliandra 部分。分析的花粉材料被乙酰化，然后在光学显微镜 (LM) 下进行测量、描述和显微照相。将定量数据提交给描述性统计处理。在卡利安德拉教派。Androcallis 和 C. 教派。Monticola，polyads 的长度和宽度往往比 C. 教派中的要大。小胼胝。在 C. 教派中。Monticola，一个附属物存在于顶端花粉粒的最尖锐区域。定量数据表明，最大的多聚体发生在 C. macrocalyx var. 中。大花萼，尺寸为 250 µm × 150 µm，最小的多聚体出现在 C. leptopoda，为 117.5 µm × 65 µm。根据获得的 polyad 长度数据，可以将物种区分为研究部分内和部分之间的不同组。顶端花粉粒最尖锐的区域存在附属物。定量数据表明，最大的多聚体发生在 C. macrocalyx var. 中。大花萼，尺寸为 250 µm × 150 µm，最小的多聚体出现在 C. leptopoda，为 117.5 µm × 65 µm。根据获得的 polyad 长度数据，可以将物种区分为研究部分内和部分之间的不同组。顶端花粉粒最尖锐的区域存在附属物。定量数据表明，最大的多聚体发生在 C. macrocalyx var. 中。大花萼，尺寸为 250 µm × 150 µm，最小的多聚体出现在 C. leptopoda，为 117.5 µm × 65 µm。根据获得的 polyad 长度数据，可以将物种区分为研究部分内和部分之间的不同组。