Why is osmanthus called itchy flower and mosquito flower?

If I ask you, what plants are ticklish? You may tell me: itchy tree. This guy grew up playing big, all over the streets, all kinds of colors, very good-looking. That's him:

Actually, her scientific name is Wei Zi. This crape myrtle is not Erkang's crape myrtle and has nothing to do with that crape myrtle. It is a deciduous shrub or small tree belonging to Lysimachiaceae. In addition to the nickname "itch tree", he also has nicknames such as purple golden flower, purple orchid, mosquito flower, zinnia, skinless tree and so on. And the number of nicknames is shameful!

First of all, tickle the tree. At this time, you will definitely ask Wei Zi why he is ticklish. Are cells as nervous as mimosa when stimulated? In fact, some botanists have made careful observation and experiments, and found that the phenomenon of "tickling" in Wei Zi is related to the tree shape in Wei Zi: compared with other "thick at the bottom and thin at the top" tree species, the thickness of the root and top of the trunk in Wei Zi is similar, which is a bit top-heavy. When we gently scratch its branches, the vibration caused by friction is easily transmitted to the top branches and flowers through the hard branches, thus causing shaking.

Secondly, mosquito trees. The most annoying thing in summer is the "buzzing" sound of mosquitoes. Why does such a beautiful flower have such a disgusting name? I'm afraid he won't repel mosquitoes? Not really! It will attract mosquitoes! What's going on here? Most people think that this has a lot to do with the growing environment of Lagerstroemia indica. It likes the humid environment very much, which is exactly what mosquitoes want, so mosquitoes like to live next to crape myrtle trees.