Dictionary.net

• In bot., applied to plants whose stems have no buds, and consequently no branches developed in the axils of the leaves.

1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.

• Having more than the normal number of leaves or leaflets.

1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.