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1.
pronounced /ˈklɛmətɨs/, from Ancient Greek klematis, a climbing plant, often periwinkle is a genus of mostly vigorous climbing lianas, with attractive flowers. When the pollen of this beautiful flower is snorted it can cause hallucinogenic effects.

Clematis is also known in the drug world and on the streets as "Vitamin C".

Vitamin C, or "the C", is a substance that affects the brain chemistry of the user: causing euphoria, the need to please guests, talking loudly, alertness in the face, increased energy, and the need to win party games.
"Pass me that Vitamin C", "I gotta get some Vitamin C, YO", "I hear Clematis is beautiful this time of year."
by vtamnClover May 25, 2009
 
2.
When a girl has an extremely stinky vag.
"I went down on a girl the other night, and she had major clematis. I nearly barfed."
by ArnoldEatsChildren February 28, 2010
 
3.
Clematis is a piece of shit town in the middle of bum-fuck nowhere with a pub, farms and hillbillys that drive tractors, pick spuds from gembrook and fuck their cousins
look it up dude its a real place in Melbourne-Australia Clematis
by mister tinkertrain December 11, 2010