Phoradendron.
Phoradendron flavescens, Nuttall.
a stem, b leaf, c pistillate spike.
This image is from Gleanings in Materia Medica in the American Journal of Pharmacy, 1883.
A herbal distance course
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.