Tree Walk: Unidentified locusts - update

Les of A Tidewater Gardener identified the Le Conte locusts as Robinia pseudoacacia 'Purple Robe.' (Thank you Les.) The illusive "Illustrated Guide to the Street Tree Planting Program" published by the City of Berkeley lists the tree as Robinia ambigua 'Purple Robe.' The guide is available at the reference desk of the Berkeley Library's central branch; it is not available online.