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Plants include cotton sedge , bog moss ( " Sphagnum " ) , great hairy willowherb , bog myrtle , water figwort , flag iris , cross-leaved heath , bog rosemary , cranberry and sundew ; common alder trees , alder buckthorn , grey sallow and crack willow predominate in wooded fringes , along with some introduced scotch pine .
 flag iris, cranberry, common alder
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 flag iris, cranberry, common alder