BSI Flora of India Checklist (Distribution):

Name Distribution
Acranthera anamallica Endemic to India: Tamil Nadu
Acranthera grandiflora Endemic to India: Kerala, Tamil Nadu
Acranthera griffithii Arunachal Pradesh (syn. of Mussaenda maingayi (Hook.f.) Hemsl. ex T.Durand & B.D.Jacks. as per POWO. Also no distribution shown in India)
Acranthera tomentosa Arunachal, Assam, Manipur, Meghalaya, Mizoram, Nagaland

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Flora of Peninsular India with keys at species links, if any:
Acranthera anamallica
Acranthera grandiflora