When the word “plaid” is mentioned, oftentimes my brain projects the image of Scotland’s national costume.
So I googled this word and Merriam-Webster Dictionary came up with the following definition:
plaid -noun \ˈplad\ : a pattern of unevenly spaced repeated stripes crossing at right angles
I guess this definition fits on the description of Gymnocalycium mihanovichii, commonly known as the Plaid Cactus. The green-brown body of the plant has a pattern of banding and ridges. Moreover, this cactus produces pink flowers.