'Pendulifolia' is sold down here. Mine produces drooping shoots on the edges. 'Blue Streak' is an AGM plant, that I may not have seen listed in North American commerce, that I would like to try. Was the UBC specimen imported by UBC?
Ron, our source for this plant was Hadlow College of Agriculture and Horticulture in Kent, UK. For those reading, 'Blue Streak' refers to the colour of the branches on the new growth - they are a waxy light blue.
I offer Salix acutifolia 'Blue Streak' for sale as dormant cuttings! MIchael Dodge. Vermont Willow Nursery. http://willowsvermont.com/WillowsVermont.com/Home.html