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"The angular displacement in Mimosa and in Venus was measured to compare the drugged groups with control groups. Assumed p-value = 0,01, amlodipine showed have no significant effects vs. control in mimosa and Venus flytrap (p > 0,10) with 118 degrees of freedom. In the same way ketamine had no significant effects vs. control in mimosa and Venus flytrap (p > 0,10). Lidocaine had significant effect vs. control group in mimosa causing strong immobilization of the petioles (p < 0,001) and spontaneous closing of leaflets, but not in Venus Flytrap (0,02 > p > 0,01). Ether had an evident effect in Mimosa and Venus Flytrap (p < 0,001) causing almost total immobilization."
Ether is in the group of anesthetic vapors whose function is mysterious, along with chloroform and even argon and xenon. These are the ones that seem to work on plants as well as animals.
https://www.tandfonline.com/doi/full/10.4161/psb.21000#d1e86