Delimination of the taxon, Justicia diffusa Willdenow is discussed, and 10 taxa falling within the Indian Subcontinent have been treated under the newly erected subsection: Diffusa Ellis including four varieties under Rostellularia diffusa (Willd.) Nees, and two varieties each under R. quinqueangularis Koenig ex Roxb. and R. vahlii (Roth) Nees.
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