I don't know why, but recently I've realized that after all those years, my collection did not contain any of this wonderful little species somehow...so I bought one last month. Now it is sending out two flower spikes.
This is a dwarf variety of Phal. japonica: its leaves are just about an inch long, much smaller than already small-sized species; there are some variegated dwarf varieties developed in Japan which looks quite spectacular, btw.