4795
" Helianthus paradoxus " formed 75,000 - 208,000 years ago as a hybrid of " H. annuus " , the common sunflower , and " Helianthus petiolaris " , the prairie sunflower .
 plant: H. annuus; plant: Helianthus petiolaris
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 plant: H. annuus; plant: Helianthus petiolaris