quackgrass, Agopyron repens 偃麦草
quaking-grass, Briza media 凌风草
radish, wild, Raphanus raphanistrum 野芥菜
ragged-robin, Lychnis flos-cuculi 剪秋萝
ragweed, Artemisia artemisiifolia 豚草
ragwort, common, Senecio jacobaea 新疆千里光
London, S. x subnebrodensis 伦敦千里光
Oxford, S. squalidus 牛津千里光
red-hot poker, Kniphofia spp. 火把莲
redshank, Persicaria maculosa 春蓼