is a specific kind of: herb, herbaceous plant.

is a broader term that covers: broad-leaved montia, Montia cordifolia | blinking chickweed, blinks, Montia lamprosperma, water chickweed | Montia chamissoi, toad lily | Cuban spinach, miner's lettuce, Montia perfoliata, winter purslane.

is a member of: genus Montia, Montia.