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There are several pink forms of Robinia out there - being older and "neglected" may make it hard to pin down a clone. 'Purple Robe' is a darker form that's pretty common in the midwest.
Check (if possible) the stems to observe level of hairiness or bristly-ness, if one is dead set on differentiation.
All the Black Locust group are good bets on sterile and droughty soils, thus probably why this one ended up along a bike path. Plant it and walk away (or maybe the seed was transported there from elsewhere).
Take a look in Dirr's 5th edition (pp. 902-905) for more than you'd ever want to know about rascally rosy Robinia.
Thanks all and I should have know Vib would give me direction. I will look at my Dirr, but I don't have the 5th. Thanks all, my biking friend will be happy as she is a serious rider who has watched this tree for years and wondered. I am heading out to take a look at it now. Thanks, Patti
