purpletop
noun (1)
variants:
or less commonly purpletop grass
Definition of purpletop
(Entry 1 of 2)
: a sticky grass (Triodia flava) of the eastern U.S. with purple panicles
purple-top
noun (2)
variants:
or less commonly purple-top wilt
Definition of purple-top (Entry 2 of 2)
: an insect-transmitted and often fatal disease of potato plants caused by the same virus that produces aster yellows and characterized by a purplish or chlorotic discoloration of the top shoots, swelling of axillary branches, and severe wilting