Thesium L. is in need of revision and has been identified as a high priority for taxonomic research in South Africa. As part of an ongoing effort to revise the genus, a group of nine morphologically similar taxa from Subgenus Frisea is revised, including three taxa classified by the IUCN as data deficient due to taxonomic problems and one species new to science (T. atratum N.Lombard & M.M.le Roux). Species of the group, referred to here as the T. scirpioides complex, share the following characters: (1) inconspicuous unarmed herbs or suffrutices, (2) scale-like leaves, (3) indeterminate spike-like inflorescences, (4) post-staminal hairs attaching the anthers to the perianth and (5) twisted placental columns. A comprehensive taxonomic revision of the T. scirpioides complex is presented, including an identification key, updated nomenclature and typifications, descriptions, diagnostic characters, distribution maps and conservation notes. Seven species are recognised and two varieties newly synonymised.

Thesium L.需要修订，已被确定为南非生物分类研究的高度优先事项。作为不断修改属的努力的一部分，对来自弗里西亚属的9种形态相似的分类群进行了修订，其中包括3种因分类问题而被IUCN归类为数据不足的分类群和一种新的科学物种（T. atratum N.伦巴底（Lombard＆MMle Roux）。该组的物种，在这里称为T. scirpioides复杂，具有以下特征：（1）不显眼的无刺药草或种属植物，（2）鳞片状的叶子，（3）不确定的穗状花序，（4）将花药附在花被上的-后毛和（5）胎盘扭转。提出了螺旋拟南芥复杂的综合分类学修订版，包括识别码，更新的命名法和分类，描述，诊断特征，分布图和保护说明。识别了七个物种，两个新变种成为同义词。