water spinach

Short definition from Wiktionary

Noun

1. 1
   Ipomoea aquatica, a green leafy vegetable used as a food in several cuisines of East and Southeast Asia
2. 2
   Amaranthus dubius, often bearing red or purple marks
3. 3
   Amaranthus tricolor, edible amaranth
4. 4
   Basella alba, Malabar spinach, with thick, succulent, heart-shaped leaves