It's often said that Joseph Rock was an eccentric. He was an irascible man who lived alone in the wilds of China. He never married and seemed to have few real friends. I've sometimes wondered what made him choose that kind of life - especially given he was an accomplished botanist who could have led a life of the well-regarded expert in the US. Was he a repressed homosexual or a tortured soul who never recovered from his strict Catholic upbringing? I don't think so.
Perhaps this musing from his diaries may explain what really motivated him: