Some oaks also have another parasite: the love vine, Cassytha filiformis. The love vine is an obligate parasite, which means it cannot survive on its own and instead must attach itself to another plant. Love vines don't have significant leaves, can't physically support themselves, nor can they collect their own water or nutrition. Instead, they infiltrate woody trees and bushes, extending their creepers into interior tissues where they can suck out nutrients and water for their own use. These growths are called haustoria, which are a bit like root systems. Many plants can support a love vine without dying, but if the vine grows too fast for too long it can kill the host.