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| Bedstraw or Rubiaceae have whorls of leaves along the square stems | Bellflower or Campanulaceae have the petals joined into a bell | Borage or Boraginaceae have petals fused at the base and four large seeds | Broomrape or Orobanchaceae are parasitic; no green leaves | ||||||||||
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| Buttercup or Ranunculaceae have many stamens and carpels | Cabbage or Brassicacea have four petals arranged in a cross shape | Campion or Caryophyllacea have four or five petals, often divided | Carrot or Apiaceae have the flowers on radiating stalks in umbels | ||||||||||