In the 1st photo, the yellow flower was from Neptunia oleracea (common name: Water Mimosa; Family: Fabaceae). A link is provided here:
The 2nd - 4th photos showed the Monochoria vaginalis (common name: Heartleaf False Pickerelweed, Oval-Leafed Pondweed) from the Pontederiaceae Family, the arrow-head leaves and the elegant-looking pale blue flowers. A link is attached for reference:
Finally the last 2 photos were the heart-shaped leaves of the Houttuynia cordata from the obscure Saururaceae Family. Apparently this herbaceous plant has some traditional uses, as shown in the link below.