Last week the overpowering fragrance in the Asian Collections was Styrax japonicus, this week it's Mock Orange, Philadelphus. The Flora of China lists 22 species as occurring in China. A handful of those are represented in the Asian Collections. They are fragrant, which is a good thing because they are messy, perennially unhappy plants that have a significant amount of dead wood on them at any given time no matter how assiduously you attend to them. But they smell so good you don't even care.