Laboratory of Plant Systematics, Institute of Botany and Microbiology, Katholieke Universiteit Leuven, Kasteelpark Arenberg 31, B-3001 Leuven, Belgium.
Am J Bot. 2004 May;91(5):627-43. doi: 10.3732/ajb.91.5.627.
The former Primulales used to be subdivided into the woody Theophrastaceae and Myrsinaceae, from the tropics and subtropics, and the herbaceous Primulaceae, which are mainly found in the temperate regions of the northern hemisphere. Recent analyses based on morphological as well as molecular data revealed a close relationship between the genus Samolus L. of Primulaceae and the monophyletic family Theophrastaceae. We studied the floral development of six species from four different genera of Theophrastaceae and compared it to floral ontogenetical data of Samolus valerandi L. to find support for a close relationship. Samolus and the members of Theophrastaceae share the presence of staminodes and a similar development of the placenta and the ovules. Apart from the different habit and distribution, however, we also observed some major differences between both lineages, such as the absence of common primordia in Theophrastaceae, the development of a gynoecial cap in Samolus, and the difference in development, shape, and structure of the staminodes. Therefore, we propose to keep Samolus separated from the genera of the Theophrastaceae, and we suggest that it be raised to family level.
以前的报春花目被分为木质的紫金牛科和紫金牛科，来自热带和亚热带，以及草本报春花科，主要分布在北半球温带地区。基于形态和分子数据的最新分析表明，报春花科的萨缪尔属与单系科紫金牛科密切相关。我们研究了四个科的六个物种的花发育，并将其与萨缪尔Valerandi L 的花发生数据进行比较，以找到密切关系的支持。萨缪尔和紫金牛科的成员都有退化雄蕊的存在和胎座和胚珠的相似发育。然而，除了不同的习性和分布外，我们还观察到这两个谱系之间存在一些主要差异，例如在紫金牛科中不存在共同的原基，在萨缪尔中发育出雌蕊帽，以及退化雄蕊的发育、形状和结构的差异。因此，我们建议将萨缪尔与紫金牛科的属分开，并建议将其提升为科一级。
