I shuddered and then I remembered

I shuddered and then I remembered
The dangerous heads of the nails
That were squeezed from the mildewing boards
Of the deck behind the house.

I sang it then first when I begged of you
To open the nocturnal flower
I'd gazed at the prior twelve nights
Through a reflecting telescope.

The petals dipped their wet ends
To the sod of the penitent earth
In a vain, lugubrious display.

We'd bend and then close once more;
Another will sob through a cycle
And snag themselves here yet again.