Coma: 1) A tuft of hairs, especially on the tip of a seed; 2) the tuft of bracts on a pineapple; 3) the head of a tree*
The seeds of this Asclepias syriaca (common milkweed) each have a silky coma to help them travel on the wind.
*Harris, J.G., Harris, M.W. (2001). Plant identification terminology: An illustrated glossary (2nd ed.). Spring Lake: Spring Lake Publishing.