Oxalis spiralis (Introduced)

Colombia (Boyacá, Caldas, Cauca, Cesar, Cundinamarca, Magdalena, Nariño, Norte de Santander, Putumayo, Quindío, Santander, Tolima, Valle), Peru, Costa Rica, Ecuador, Bolivia (Cochabamba, La Paz, Santa Cruz), Venezuela (Aragua, Barinas, Distrito Federal, Guarico, Lara, Merida, Miranda, Sucre, Tachira, Trujillo), India (Tamil Nadu (introduced)) as per Catalogue of Life;

Balsaminaceae, Geraniaceae and Oxalidaceae Week: Oxalidaceae-Oxalis spiralis from California-GS-16
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4 posts by 4 authors. 3 images.
Oxalis spiralis G. Don, Gen. Hist. 1: 755 1831
Common name: Spiral oxalis
A carpet forming perennial herb with yellow spiral flowers, photographed from SFO Botanical Garden in California

21022018PP3 : 7 posts by 3 authors. Attachments (1)- 4 MB.
Location: Bombay Shola, Kodaikanal, Tamil Nadu
Altitude: ~2100 m
Date: 20/01/18
Habit: Herb
Habitat: Gregarious, on the roadside
Approx. height: 5 cm 
Insertion of leaves: Whorled
Flower diameter and length: 0.5 × cm 

It is certainly an Oxalis sp. Unlikely to be Oxalis corniculata L. because of the altitude like Bombay shola. (2100m).
Family :
Since the flower has reddish veins outside the possibility is Oxalis spiralis Ruiz & Pav. ex G.Don
This species will have many flowers on their pseudo raceme.  The photograph here does not show their actual nature.
Native to S.America and is a weed in most of the higher altitude hill stations in Kerala and Tamil Nadu.

Further check at 

Thank you ... Is this what you mean by 'many flowers on their pseudo raceme' ?
Attachments (1) - 5 mb.

Yes. It looks like Oxalis spiralis Ruiz & Pav. ex G.Don 
Please see the following link

Attachments (3). 7 posts by 5 authors. 
Requesting to please ID this plant captured growing by the roadside in Ooty, Tamil Nadu in November 2013.
This is surely an Oxalis species, I cannot fix the species to those I know..
yes, this is an Oxalis, please check our group's database for earlier discussions and keys. My internet is very slow here
Some Oxalis species in India & efi  
Yes, this is Oxalis corniculata L.
This is Oxalis spiralis as per images and details herein.