18444
It is similar to " Cucurbita californica " , " Cucurbita cordata " , " Cucurbita cylindrata " , and " Cucurbita palmata " and all these species hybridize readily .
 Cucurbita californica, Cucurbita cordata, Cucurbita cylindrata, Cucurbita palmata
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:
 Cucurbita californica, Cucurbita cordata, Cucurbita cylindrata, Cucurbita palmata