Vampire Rose
The Vampire Rose or Bloodrose is one of the many, many deadly plant monsters found in Dungeons & Dragons. In this particular case, Vampire Roses are blood-sucking vine-type roses, which lash out at nearby living creatures to impale them with their thorny branches and exsanguinate them. A starving Vampire Rose is pure white, but the more well-fed they are, the deeper red they turn.
The Vampire Rose debuted in the module B3: Palace of the Silver Princess for Basic Dungeons & Dragons, as the... "Jupiter Blood Sucker". Yeah, Tom Moldvay saved this one. A mainstay in such modules as X2: Castle Amber, it went on to the Mystara and second Ravenloft Monstrous Compendiums, and 3e's Denizens of Darkness/Dread. Its most recent appearance was in Dungeon Magazine #195 for Dungeons & Dragons 4th Edition (thus spreading the infestation into Nentir Vale).
An actual vampire plant was mentioned in background lore in The Elder Scrolls 4: Oblivion. In the first Thieves Guild quest, you're sent to prove your worth of entering the guild by stealing a diary from a local of the Imperial City, Amantius Allectus. He experimented infecting a plant with vampirism disease, and it became a bloodthirsty plant that thrives in darkness as long as it has blood, being capable of sensing and reaching its vines out towards sources of blood. Naming the plant "Drinkers", he apparently realized he was inventing a new monster and, horrified, left them on the roof of his building to be burnt to ash in the sun.
