Ammannia lanceolata

Ammannia lanceolata B. Heyne ex Wall., Fl. Brit. India 2: 570 1879. (syn: Ammannia lanceolata B. Heyne ex C. B. Clarke; Ammannia verticillata Wight & Arn.; Ditheca verticillata Miq.; Nesaea lanceolata (Heyne ex Cl.) Koehne);

Sri Lanka, India as per Catalogue of Life;



https://08511630493324166816.googlegroups.com/attach/9fd66f17343dedb/Unidentified%20Rotala%20species%20I2%20IMG_3729.jpg?part=0.1&view=1&vt=ANaJVrFDad3OXLtSxJNhpnXxwYG6phsm0zjLAhs9e9LOvjyz5KPr20WGhRBrX34J5c10J6h3Cmxa_miHPym7BTqCCuLDsgW-KK2qLXqwi7w_PAalyOE0dF8
 
https://08511630493324166816.googlegroups.com/attach/9fd66f17343dedb/Unidentified%20Rotala%20species%20I%20IMG_3729.jpg?part=0.2&view=1&vt=ANaJVrH4QfZdV4AuFYGjooQP1-ROLkb8P7iayp_NxplTD-4YQbfGsM5Mm6SoF10ldHyVN4pf4CeqQ3750X8qZH7-O7t_fvQkToE_aFl34PrfRE6Z5xhfO2U
Unidentified Rotala (?) species : 4 posts by 2 authors. Attachments (3)
Seen in a wet channel from leaking water from a small water hole.

Yes it is also Rotala densiflora (Roth) Koehne
Going by flowers, it appears more closer to Ammannia auriculata Willd.   
Sorry, on further examination, it is closer to Rotala densiflora (Roth) Koehne only.
It resembles Nesaea for me
The specimen displayed is not Rotala but Nesaea lanceolata (Heyne ex Clarke) Koehne
Please look for more than one flower or flower buds in a node as a condensed cyme.


References:

Catalogue of Life  POWO (Ammannia prostrata Buch.-Ham. ex Dillwyn) The Plant List Ver.1.1  GBIF (High resolution specimens) High resolution specimen  Flora of peninsular India Plant illustrations 
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