This is one that slipped under the radar but should not have. Flower definitely shared some of the sonic dissonance with the aforementioned bands, mixing in a bit of Joy Division's darkness and Mission of Burma's melodic sense. After Flower, two of these guys went on to form Versus.
Concrete Sky is a compilation of Flower's total recorded output - the Hologram Sky EP and Concrete LP - plus a live track from the compilation NYU's Sorority Sampler. It's all out of print, originals and reissues, so don't feel guilty.