Cleistanthus

Cleistanthus andamanicus N.Balach., Gastmans & Chakrab. (Andaman Is. as per WCSP)

Cleistanthus collinus (Roxb.) Benth. ex Hook.f. (Indian Subcontinent: Bangladesh, India, Pakistan, Sri Lanka as per POWO)

Cleistanthus malabaricus (Müll.Arg.) Müll.Arg. (W. & S. India as per POWO)

Cleistanthus oblongifolius (Roxb.) Müll.Arg. (Bangladesh to Queensland: Andaman Is., Bangladesh, Borneo, Cambodia, Jawa, Lesser Sunda Is., Malaya, Maluku, Myanmar, New Guinea, Nicobar Is., Philippines, Queensland, Solomon Is., Sulawesi, Sumatera, Thailand, Vietnam as per POWO)

Cleistanthus patulus (Roxb.) Müll.Arg. (E. & S. India, Sri Lanka as per POWO)

Cleistanthus travancorensis Jabl. var. jaleelianus E.Girish & Sunoj kr. (Kerala)

.
Species as per Flora of India Vol 23 (Editors N. P. Balakrishnan, T. Chakrabarty, M. Sanjappa, P. Lakshminarsimhan & P. Singh- by Botanical Survey of India (2012)):
Cleistanthus andamanicus N. Balach., Gastmans & Chakrab. (Endemic to India: Andaman & Nicobar Islands)
Cleistanthus balakrishnanii Chakrab. (Endemic to India: Andaman & Nicobar Islands)
Cleistanthus collinus (Roxb.) Benth. ex Hook.f. (Andhra Pradesh, Bihar, Himachal Pradesh, Karnataka, Kerala Madhya Pradesh, Odisha, Tamil Nadu, Uttarakhand, Uttar Pradesh, West Bengal)
Cleistanthus malabaricus (Müll.Arg.) Müll.Arg. (Endemic to India: Karnataka, Kerala, Maharashtra, Tamil Nadu)
Cleistanthus myrianthus (Hassk.) Kurz (Andaman & Nicobar Islands) (syn. of Cleistanthus oblongifolius (Roxb.) Müll.Arg. as per POWO)
Cleistanthus oblongifolius (Roxb.) Müll.Arg.
Cleistanthus patulus (Roxb.) Müll.Arg. (Andhra Pradesh, Karnataka, Kerala, Odisha, Tamil Nadu)
Cleistanthus travancorensis Jabl. ()
var. sankunnianus (Sivar. & Balach.) P.S.Udayan & Chakrab. ()
var. travancorensis ()

.
Flora of Peninsular India with keys at species links, if any:
Cleistanthus collinus
Cleistanthus malabaricus
Cleistanthus patulus
Cleistanthus sankunnianus (syn. of Cleistanthus travancorensis var. sankunnianus (Sivar. & Balach.) Udayan & Chakrab.)
Cleistanthus travancorensis

.
Cleistanthus‎‎ (Phyllanthaceae) page with comparative images:
Pl. go through‎ Cleistanthus‎‎ (Phyllanthaceae) page with comparative images of species in efloraofindia. On clicking the link of species, one can check the complete details. Genus pages generally give details of most of the species found in India.
I request you to pl. go through & point out mistakes, if any. I hope this will aid in identification in future. If anybody can send images of other species of this genus (for incorporation in the website), if any, or can identify unidentified images, it will be really nice.
Most of the credit goes to Tapas ji, for Phyllanthaceae.