red rhubarb plant crown growing in early spring, with green leaves and stalks. edible vegetable garden plant with oxalic acid in

acid angiosperms buckwheat canadian caryophyllales close crown crowning cultivated dormancy early edible eudicots gardening genus growing herbaceous leaf leaves macro medicinal out oxalate oxalic perennial pink plant planted poisonous polygonaceae polygonoideae red rhabarbarum rheum rhizomes rhubarb root roots spring stalks vegetable