is a specific kind of: herb, herbaceous plant.

is a broader term that covers: common wood sorrel, cuckoo bread, Oxalis acetosella, shamrock | Bermuda buttercup, English-weed, Oxalis cernua, Oxalis pes-caprae | creeping oxalis, creeping wood sorrel, Oxalis corniculata | goat's foot, goatsfoot, Oxalis caprina | Oxalis violacea, violet wood sorrel | oca, oka, Oxalis crenata, Oxalis tuberosa.

is a member of: genus Oxalis.