Thunbergia

Thunbergia grandiflora                                    Thunbergia laurifolia
Leaves ovate, to 20 cm long, angular toothed.   Leaves ovate-lanceolate, to 12 cm long
Leaf base cordate                                                      Leaf based narrowed
pedicel 4-5 cm long                                                  Pedicel 2 cm long
Thunbergia alata Bojer ex Sims (Images by Gurcharan Singh & Dinesh Valke (Inserted by J.M.Garg))

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Thunbergia bicolor (Wight) Lindau (Images by Hareesh V S (Inserted by J.M.Garg))

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Thunbergia coccinea Wall. (Images by Aarti S Khale, Prashant Awale, Alka Khare (Validated by Varun Sharma) & R. Thilakan Makkiseril (Identified by E.S.Santhosh Kumar & Vijayasankar Raman) (Inserted by J.M.Garg))

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Thunbergia erecta (Benth.) T.Anderson (Images by Raghu Ananth, Gurcharan Singh & Bhagyashri Ranade (Inserted by Bhagyashri Ranade & J.M.Garg))

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Thunbergia fragrans Roxb. (Images by J.M.Garg & Bhagyashri Ranade (Inserted by Bhagyashri Ranade & J.M.Garg))

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Thunbergia grandiflora Roxb. (Images by Gurcharan Singh & Surajit Koley (Inserted by J.M.Garg))

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Images by Saroj Kumar Kasaju (Inserted by J.M.Garg) (For more photos & complete details, click on the links)

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Thunbergia species in India:
Thunbergia alata Bojer ex Sims (Cultivated & Naturalized)
Thunbergia bicolor (Wight) Lindau
Thunbergia coccinea Wall. ex D.Don
Thunbergia erecta (Benth.) T.Anderson (Cultivated)
Thunbergia fragrans Roxb.
Thunbergia grandiflora (Roxb. ex Rottler) Roxb.
Thunbergia laevis Wall. ex Nees
Thunbergia laurifolia Lindl.
Thunbergia lutea T.Anderson
Thunbergia maculata Lace
Thunbergia mysorensis (Wight) T.Anderson
Thunbergia natalensis Hook. (Cultivated)
Thunbergia tomentosa Wall. ex Nees
 
References
Efloraofindia 2007 onwards. Thunbergia. Accessed at /species/a—l/a/acanthaceae/thunbergia on 3-07-2020.
Karthikeyan, S., Sanjappa, M. and Moorthi, S. 2009. Flowering plants of India Dicotyledons volume 1 (Acanthaceae – Avicenniaceae). BSI, Kolkata. pp. 61-62.

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Binomial Habit Notes Ref. Distrib.
Thunbergia alata Boj. ex Sims Climber Western Ghats
& Eastern Ghats, Low to High Altitude, Cultivated / Naturalized, Native
of Tropical Africa		 Flora of Tamil
Nadu, VOL. II, 1987		 Dharmapuri,
Dindigul, Salem, Theni 
Thunbergia bicolor (Wight) Lindau Climber Western
Ghats, Evergreen Forests		 Flora
of Tamil Nadu, VOL. II, 1987		 Nilgiri
Thunbergia erecta (Benth.) T. And. Shrub Plains
, Cultivated, Native of Tropical Africa		 Flora
of Tamil Nadu, VOL. II, 1987		 All
districts
Thunbergia fragrans Roxb. var. fragrans Twiner Western
Ghats & Eastern Ghats, Dry Deciduous to Moist Deciduous Forests		 Flora
of Tamil Nadu, VOL. II, 1987		 Dindigul,
Nilgiri, Salem, Tiruvanna malai
Thunbergia fragrans Roxb. var. vestita Nees Twiner Western
Ghats & Eastern Ghats, Dry Deciduous to Moist Deciduous Forests		 Flora
of Tamil Nadu, VOL. II, 1987		 Dindigul,
Nilgiri, Salem
Thunbergia grandiflora (Roxb. ex Rottl.)
Roxb.		 Climber Plains
to  High Altitude, Cultivated, Native
of Tropical Africa		 Flora
of Tamil Nadu, VOL. II, 1987		 All
districts
Thunbergia mysorensis (Wight) T. And. Climber Western
Ghats & Eastern Ghats, Dry Deciduous Forests		 Flora
of Tamil Nadu, VOL. II, 1987		 Coimbatore,
Dindigul, Namakkal, Nilgiri
Thunbergia tomentosa Wall. ex Nees Climber Western
Ghats, Evergreen Forests		 Flora
of Tamil Nadu, VOL. II, 1987		 Coimbatore,
Dindigul, Nilgiri
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Botanical name Synonyms Family Common name
Thunbergia alata Acanthaceae Black-Eyed Susan Vine
Thunbergia coccinea Acanthaceae Scarlet Clock Vine
Thunbergia erecta Meyenia erecta Acanthaceae King’s Mantle
Thunbergia fragrans Acanthaceae Sweet Clock Vine
Thunbergia grandiflora Acanthaceae Bengal Clock Vine
Thunbergia laurifolia Thunbergia grandiflora var. laurifolia, Thunbergia harrisii Acanthaceae Laurel Clock Vine
Thunbergia mysorensis Hexacentris mysorensis Acanthaceae Mysore Clock Vine
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Species with description & keys in Flora of Pakistan :
Thunbergia coccinia Wall. ex D. Don
Thunbergia erecta (Benth.) T. Anderson
Thunbergia fragrans Roxb.
Thunbergia grandiflora (Roxb. ex Rottler) Roxb.

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A Revised Handbook to the Flora of Ceylon -, Volume 12 By M. D. Dassanayake- Details with keys–
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Flora of Davanagere District, Karnataka, India By B. K. Manjunatha, V. Krishna, T. Pullaiah (2004- Keys & descriptions):
T. fragrans var. laevis (Nees) C. B. Clarke ex Hook.f. syn. of Thunbergia laevis Nees
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Floriculture in India By Gurcharan Singh Randhawa, Amitabha Mukhopadhyay (1986- descriptions)
Thunbergia affinis,
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Gardening in India By George Marshall Woodrow, G Marshall (1999)-
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Thunbergia‎ (Acanthaceae) :  1 post by 1 author.

I have updated eFI (efloraofindia) page on Thunbergia (Pl. click).

Attempts have been made to incorporate most of the species available in India & nearby areas with details & keys directly or through links as far as possible. It’s quite possible that there may be some discrepancy in the accepted names & synonyms taken from other links.

Species discussed so far in efloraofindia are given at the bottom of the page in the form of links against Subpages. On clicking them one can see all the details.

If someone can provide complete list of Indian species with source references it will be wonderful.
Any comments/ corrections are welcome.

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‎Thunbergia page with images of species in efloraofindia : 2 posts by 1 author.
Pl. go through ‎Thunbergia page with images of species in efloraofindia (done mainly by me).

If you find any mis-identification, pl. let us know.
If anybody can send images of other species of this genera (for incorporation in the website), it will be really nice. Also, if anybody is interested to take up the activity of inserting images on efloraofindia pages from efloraofindia posts, pl. let us know.