Trispen

I have just come across The Meaning of Liff, a satirical dictionary by Douglas Adams and John Lloyd, published in 1983. In it is listed:

Trispen, n., A form of intelligent grass. It grows a single tough stalk and makes its home on lawns. When it sees the lawnmower coming, it lies down and pops up again after it has gone by.

The Meaning of Liff, by Douglas Adams and John Lloyd

I wonder what this might look like?