Task: Text Simplification
Input (English): wahlenbergia species have dispersed widely , even to oceanic islands , and there are four species known from the island of st helena , including the now extinct species w. roxburghii.
Output (English): wahlenbergia species have broken up and moved away widely , even to oceanic islands , and there are four species known from the island of st helena , including the now gone forever species w. roxburghii.