29475
The larvae feed on rushes ( " Juncus " species ) , producing spun silken pupal cases within which they overwinter on the seed heads .
 Juncus
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:
 Juncus