dumb cane
noun
: dieffenbachia
Example Sentences
Recent Examples on the Web Maculata/seguine, commonly known as spotted dumb cane because its sap can cause irritation of the mouth, is a popular species featuring narrow green leaves with irregular white markings. 
Lisa Boone, Los Angeles Times, 15 June 2021
Lisa Boone, Los Angeles Times, 15 June 2021 Word History
Etymology
from the fact that chewing it causes the tongue and throat to swell
First Known Use
1696, in the meaning defined above