I think it was on an island.  People were being killed or found dead.  They had a large mark or marks like a giant insect bite.  It was a tree or plant a mad scientist created that ate blood.  At the end the plant was dieing and the mad scientist run to it and said take me.  The tree then started sucking out his blood as it died.  That was the end.  I know...... it sounds lame!  But help me out anyway please.

La Isla de la Muerte

Mel Welles, who faced the wrath of a man-eating plant as florist Gravis Mushnik in Roger Corman's Little Shop of Horrors, moves to the other side of the camera to direct a film featuring even more specimens of carnivorous plant-life. Cameron Mitchell portrays the evil, worm-munching Von Wesser, a homicidal horticulturist on a remote island who breeds several forms of monstrous hybrid plants which feed on human blood. His routine practice of feeding wealthy tourists to the hungry foliage proves his undoing when intrepid shutterbug David Moss (George Martin) catches on. Silly but fun, this campy Spanish production benefits from some wonderfully seedy (no pun intended) character types whose unpleasant behavior makes their gruesome deaths particularly satisfying

Time frame?  I am 51 and I would have to say I remember seeing it about 25-30 years ago.  This is a guess.  It may have been longer.  I still remember the stigma or pistil of the plant shoot out 2-3 feet and sucking the blood out out of the people it attacked.  Still want to figure out the title.

Thanks for your help.

Ron