Original sentence: The Common Bluebell (Hyacinthoides non-scripta, sometimes Endymion non-scriptus or Scilla non-scripta) is a spring-flowering bulbous perennial.The Common Bluebellflowers in April and May.The stems are 10-30 cm long and bend over at the top
Edited sentence: The English bluebell (Hyacinthoides non-scripta, sometimes Endymion non-scriptus or Scilla non-scripta) is a spring-flowering bulbous perennial.The English bluebell flowers in April and May.The stems are 10–30 cm long and bend over at the top