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|Noun||1.||sour grass - any of certain coarse weedy plants with long taproots, sometimes used as table greens or in folk medicine|
herb, herbaceous plant - a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
Rumex acetosa, sour dock, garden sorrel - European sorrel with large slightly acidic sagittate leaves grown throughout north temperate zone for salad and spring greens
Rumex acetosella, sheep sorrel, sheep's sorrel - small plant having pleasantly acid-tasting arrow-shaped leaves; common in dry places
bitter dock, broad-leaved dock, Rumex obtusifolius, yellow dock - European dock with broad obtuse leaves and bitter rootstock common as a weed in North America