1. Rukkha Sutta. Of those who sit at the foot of trees, he who does so because he desires seclusion and his needs are few, is the best. A.iii.219.
2. Rukkha Sutta. On four kinds of trees and four corresponding kinds of men. Some men are evil and their company is evil, some are good and their company is evil, etc. A.ii.109.
3. Rukkha Sutta. Just as a tree, which leans towards the east, falls to the cast when cut down, so does a monk who cultivates the Eightfold Path incline to Nibbána. S.v.47.
4. Rukkha Sutta. Mighty trees, grown from tiny seeds, overspread other trees and kill them; so are householders destroyed by their lusts. There are five hindrances (nívarana) that overspread the heart; the seven bojjhangas are not like them. S.v.96f.