Lindernia diffusa
[Spreading False Pimpernel]

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Close-up views:

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The name Lindernia sessiliflora was used for this weed in the booklet "A Guide to the Wildflowers of Singapore" published by Singapore Science Centre back in 1985. However, Lindernia sessiliflora appears to be the synonym of Lindernia nummulariifolia. When I checked the pictures of Lindernia nummulariifolia in the Internet, they seem to show a different weed. After some search, I found a weed by the name Lindernia diffusa that looks similar to my pictures. | Reference |