It's the cleistogamous form of subulata. While bisquamata can produce seed cleistogamously, eventually you will see flowers that look like tiny fried eggs (white on the outside, yellow on the inside). The number of cleistogamous stems is highly diagnostic of subulata. This form of subulata is unlikely to flower regardless of the conditions that you present it with. Subulata is very hardly and will out-compete other forms of utricularia and CP seedlings that might be growing nearby, although it is seldom a problem for larger CPs. IMHO, it's best to rip it out whenever you can; subulata is neither attractive nor easy to manage once it gets out of control.