Rhipsalis cerescula

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One of the more common varieties of Rhipsalis.

It often begins its growth by clumping up as in my 3rd photo, then it sends out new growth, on a really long stem, which eventually drops and gives the plant its hanging foliage effect.  

Often with very thin stems, cascading downwards.  I have included a nice photo of the flowers, and how they cluster and hang downwards.  All the varieties have similar, but slightly different flowers.