This is an easy and rewarding aquatic bladderwort (Utricularia). It will thrive on a sunny windowsill or under grow lights. Some people even grow it in the water trays of carnivorous plants!  It has beautiful yellow flowers that hang on 3-5" scapes.

This will come in a small clump, at least 6” worth, but it may be in a few individual sprigs, in water, or in a resealable plastic bag. 

Care:

Grow your gibba in almost any container, but it will enjoy at least a gallon of water. Mix one cup of peat moss in each gallon of water. You may need to change the peaty water if algae becomes a problem, but some algae is normal. Grow in sunny to partly sunny conditions; the sun induces flowering. This plant is tolerant of a wide range of temperatures and can even be frozen solid and return to growth when thawed.