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Latin plant name help, please

My Latin is rusty. I am looking to name a piece of art by a friend. What would be the Latin word for one single hellebore flower? Would plural hellebores flowers in a vase be called 'helleborus' or 'helleborum'?
(Yes, there is a question of the H, but I'm overlooking that).
Thanks
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https://latin.cactus2000.de/noun/shownoun_en.php?n=helleborus
It says it’s a cure for madness. Can it be bottled?