Commelina tricolor E.Barnes, J. Bombay Nat. Hist. Soc. 46: 79 1946.;
S. India as per POWO;
Commelina for ID from along Chikkamagalur mullayanagiri Road-GS08022022-2: 4 very high res. images.
Commelina for ID photographed from along Chikkamagalur mullayanagiri Road, 26-9-2015.
Could it be Cyanotis-fasciculata?
Pl. check with images at Commelina diffusa Burm.f.
To me it looks like Commelina tricolor E. Barnes. One of the beautiful, spreading/ mat forming commelinas of southern peninsular India.