Blumine translates to ‘floral’, or ‘flower’, and some believe this movement was written for Johanna Richter (1858-1943), with whom Mahler was infatuated at the time. 
The style of this movement has much in common with Mahler’s earlier works but also shows the techniques and distinct style of his later compositions.

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A listening guide of Symphony No. 1 - Blumine Movement with Lew Smoley.