what is a tall "moball"

Question

Roberto Salazar said the tall "moball" in his poem the Pioneers. What is a moball?

Answer 1

Did he really say it or was it a poor/questionable translation, such as found here:

version 1

Notice they are slightly different. Are either of them correct?

version 2

First source says:

broad mesquite and the tall moball (?)

Second source says:

beside the broad Mezquite and the tall Nopal