Impatiens glandulifera or Himalayan balsam (HB), is an invasive alien weed throughout the British Isles (BI). Classical biological control of HB in the BI using a rust fungus from the Himalayan native range was implemented in 2014. However, not all HB populations are susceptible to the two rust strains currently released. Additional strains are needed that infect resistant populations in order to achieve successful control. These are best sourced from the historical collecting sites. A molecular analysis was conducted using six chloroplast DNA sequences from leaf material from across the BI and the native range. Herbarium samples collected in the Himalayas between 1881 and 1956 were also included. Phylogenetic analyses resulted in the separation of two distinct groups, one containing samples from the BI and the native range, and the other from the BI only; suggesting that HB was introduced into the BI on at least two occasions. The former group is composed of two subgroups, indicating a third introduction. Ten and 15 haplotypes were found in the introduced and native range respectively, and with two of these found in both regions. Results show where to focus future surveys in the native range to find more compatible rust strains.

凤仙花喜马拉雅香脂（HB）是在整个不列颠群岛（BI）的一种外来入侵杂草。2014年，使用喜马拉雅山本地产的防锈真菌对BI中的HB进行了经典的生物学控制。但是，并非所有HB种群都易受目前释放的两种锈菌的影响。为了成功控制，还需要感染抗性种群的其他菌株。这些最好是从历史采集站点中获得的。使用来自BI和天然范围的叶片材料的六个叶绿体DNA序列进行了分子分析。还包括了1881年至1956年在喜马拉雅山收集的植物标本室样本。系统发育分析导致两个不同的组分离，一个组包含来自BI和天然范围的样品，另一个仅包含BI。这表明至少有两次将HB引入BI。前一组由两个子组组成，表示第三个引言。在引入的和天然的范围内分别发现了十个和十五个单倍型，并且在两个区域中发现了两个。结果表明，应将重点放在本地范围内的未来调查中，以发现更多兼容的锈菌菌株。