14694
The core collection of hardy plants are grouped in long , narrow , oblong beds by botanical family and ordered according to the classification system devised by nineteenth century botanists , Bentham and Hooker .
 Bentham, Hooker
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bentham, Hooker