Nedarim 54: Defining "Vegetables"

Chapter VII: Swearing off "vegetables" - does that include gourds? What about legumes? What drives whether the term "vegetables" is more or less inclusive? Also, the implications for punishment if this vow is violated technically are significant. Namely, the question of whether one would get lashes. Also, implications for me'ilah. What happens with different (correct) names for meat - when that meat is hekdesh?! Whose fault is it?