Many thanks Gurcharan ji for resolving my query.
I remember about the ae
ruling that you had clarified earlier.
The query arose in my mind when no mention of Rees. is found in The Plants List and NPGS/GRIN.
There are quite many results found on searching "Leucas lavandulaefolia
Rees." in Google, especially reflect in pharmacological whitepapers at reputed sites.
Tropicos too seems to show it ... http://tropicos.org/Name/17600129
Rees. also finds an entry in two reference books:
1) Indian Medicinal Plants - An illustrated dictionary - by C P Khare
2) The Useful Plants of India - NISCAIR