Your view seems most ingenious and probable; but ascertain in a good many cases that the nectar is actually within the staminal tube.
"More Letters of Charles Darwin Volume II" by Charles Darwin
The blossom is male (staminate) in its first stage and female (pistillate) in its second.
"Wild Flowers Worth Knowing" by Neltje Blanchan
Branch, with staminate flower-buds expanding.
"Outlines of Lessons in Botany, Part I; From Seed to Leaf" by Jane H. Newell
Connat; stamin 4, petal opposita; styli 4.
"Journals of Travels in Assam, Burma, Bhootan, Afghanistan and TheNeighbouring Countries" by William Griffith
These staminate flowers produce pollen and then die.
"The First Book of Farming" by Charles L. Goodrich
Are the blossoms pistillate or staminate?
"Trees, Fruits and Flowers of Minnesota, 1916" by Various
Craig, Brag and Comet, the only ones which have borne staminate flowers do not seem too hardy in the catkins however.
"Northern Nut Growers Association Report of the Proceedings at the Thirty-Eighth Annual Meeting" by Northern Nut Growers Association
Structure partly staminal, partly carpellary.
"Vegetable Teratology" by Maxwell T. Masters
Each spikelet contains a single perfect flower and sometimes in addition a staminate flower just below the perfect flower.
"A Handbook of Some South Indian Grasses" by Rai Bahadur K. Ranga Achariyar
Staminate parent of Boone.
"Northern Nut Growers Association, Report of the Proceedings at the Fourth Annual Meeting" by Various