Exacum wightianum

Exacum wightianum Arn., Ann. Sci. Nat., Bot. II, 11: 176 1839. (Syn: Exacum foliosum Griseb.; Lisianthius zeylanicus Spreng. (Unresolved));
Common name: Wight's Persian Violet

Shrubs, stem 4-winged. Leaves opposite, 6 x 4 cm, broadly ovate, lanceolate, acuminate, membranous, 5-nerved, sessile. Cymes axillary and terminal; calyx lobes winged, 12 mm, lanceolate, wings to 4 mm broad; corolla rotate, tube 6 mm, lobes 2 cm, oblanceolate, apiculate; stamens 5, filaments 4 mm; ovary many ovuled, style 8 mm, stigma sub capitate.
Flowering and fruiting: April-July
Southern Western Ghats (Endemic)
(Attributions- Dr. N Sasidharan (Dr. B P Pal Fellow), Kerala Forest Research Institute, Peechi

Images by Prabhu Kumar, inserted by Gurcharan Singh (Please click links to see details and more images).

Gentianaceae week: Exacum wightianum : 4 posts by 4 authors. Attachments (3).
Exacum wightianum collected from Muthikulam forest, Palakkad during October 2013.
Exacum is a genus which I know very little. Thanks for showing another species.

Images by Subhanjan Kayet (ID Smita Raskar) , inserted by Gurcharan Singh (Please click links to see details and more images).

Plant for id request blue flower : 2 posts by 2 authors. Attachments (3)
Plant for id request. State KERALA. october 2015
Place: Thekaddy  
Exacum wightianum, Family Gentianaceae  

efloraindia: 141011 BRS63: Date/Time-Location- )7.10.2011
Place, Altitude, GPS- Munnar (Kerala) 1800 MSL
Habitat- Urban (Road side)
Exacum sp. of Gentianaceae family.
Calyx lobes with broad dorsal wings that are prominently nerved (not so clear in the picture), leaves 5 nerved suggests that this could be Exacum petiolare.
Leaves are petioled according to the key provided by Gamble here it seems that leaves are sessile.
This appears to be interesting
I agree with ...
The leaves here are clearcut sessile. Petals are also 5. Doesn't fit in any key from BSI Maharashtra. or Cooke's flora. Is it wild or garden plant?
Yes I agree with ... that this shows some striking difference from the one that is described in the key provided by Gamble as well.
Further, I ruled out of the possibility of this being E. petiolare because of 5 petals against the 4 petals mentioned in keys.
... where exactly from Munnar you collected this plant?

I think this is Exacum petiolare of Gentianaceae
But leaves are sessile here! No petiole for petiolare
Yes ... You are right. I overlooked that completely. This must be E. pedunculatum.
I think close to images at Exacum wightianum Arn.
Exacum wightianum 
I also picked this up from Munnar, Kerala, attaching Picture of my collection.
Exacum wightianum, : 2 posts by 2 authors. Attachments (1)
Exacum wightianum,
Pothamedu near Munnar, Kerala,  in the Nilgiris
First week of October 2018