There is a very dark Asiatic Lily 'Landini'. Not a very good picture, but the color is quite close to actual color:

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Viola Black Magic and Iris germanica Superstition are the only black (near black) perennial flowers that come to me right now. For near black foliage, Cimicifuga Black Negligee and Tiarella Crow Feather.

I drove past a varicolored patch of irises today with some remarkable black ones.

My darkest has to be Dianthus barbatus 'Nigricans'...but in trying to find a pic for you, came upon the following website...think you will find many ideas there...

hth

Here is a link that might be useful: Witch's Garden

There is a very dark columbine...

Here is a link that might be useful: Black Barlow columbine

This is mostly annual for me, but this year have had a few come back....Scabiosa atropurpurea 'Ace of Spades'....Grows to about 3-4' by about 14" wide with sturdy long flowering stems.
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Tall Bearded Iris 'Before The Storm' is black. I've had it five years & find it both holds up well to heavy rain & blooms readily.

/tricia

Here is a link that might be useful: 'Before The Storm'

i have a black iris, has a dark purple tint if looked at close up, n dark purple-ish black columbimes the seeds pk said grannys bonnets

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I also have a black barlow columbine...different from the one pictured above.

Thank you , Thank you everyone. This is exactly what I was looking for. I wanted to have something different in my garden. So I am going to have a section of black in the front.

Dianthus Sooty, although it can be more biennial it reseeds itself so it is almost perennial.

Naked Coneflowers (Rudbeckia occidentalis) like 'Black Beauty' have black flowers. Theres also a new delphinium out called 'Chocolate' that has true black flowers. And dont forget the black tulips!
CMK

I have some black tulips growing in my yard, they were there when I moved in so I'm not sure of much else. May be nice for a spring bloom in black as well.