Flowers of Canna indica (Cannaceae) are arranged in 1- or 2-flowered cincinni along the inflorescence branches. Compared with the compound branches bearing 2-flowered cincinni, the more frequent 1-flowered type have simpler structures during anthesis. The lateral cincinnus meristem (CM) has been traditionally described as terminating at the second floral meristem (FM2), which may cease development later. In this research, however, we found that the CM could produce more floral structures after FM2. When the CM was separating from FM1, the phase transition regulator CiTFL1 was expressed more evidently in the CM than in the latter. The constant expression of CiTFL1 also supports the continuous existence rather than intermittent renewal of the CM. While CiWUS, which is thought to function in maintaining the meristem, had relatively low expression levels in the secondary CM and the subsequent FM2, probably indicating the future abortion of this flower. These results suggest that CiTFL1 and CiWUS may participate in controlling the flower number of the cincinnus through regulating identity transformation and maintenance of the meristems, respectively, thus affecting the inflorescence architecture.

花美人蕉（Cannaceae）布置在1-或2花沿着花序分枝蝎尾。与具有2花的cincinni的复枝相比，更常见的1花型在开花期结构更简单。侧向 cincinnus 分生组织 (CM) 传统上被描述为终止于第二个花分生组织 (FM2)，后者可能会在以后停止发育。然而，在这项研究中，我们发现 CM 可以在 FM2 之后产生更多的花结构。当CM与FM1分离时，相变调节器CiTFL1在CM中的表达比后者更明显。CiTFL1的持续表达也支持了 CM 的持续存在而不是间歇性更新。尽管CiWUS被认为具有维持分生组织的功能，在次级 CM 和随后的 FM2 中具有相对较低的表达水平，可能表明该花未来会流产。这些结果表明CiTFL1和CiWUS可能分别通过调节分生组织的身份转化和维持来参与控制cincinnus的花数，从而影响花序结构。