Simplify the following text for a Grade 12 native English-speaking person.
Original: Vegetation in the Kalahari consists mainly of grasses and acacias , but there are over 400 identified plant species present ( including the wild watermelon , or Tsamma melon ) .
Simplified: Vegetation in the Kalahari consists mainly of grasses and acacias but there are over 400 identified plant species present ( including the wild watermelon or Tsamma melon ) .