In the spring Utricularia warburgii produces 5-20 cm. flower scapes bearing 2-6 violet-blue flowers, 8mm in size and bearing a yellow splotch at the throat.
Shrubs evergreen or sometimes semievergreen; branchlets and pedicels not setose. Leaf blade adaxially glabrous; corolla creamy yellow, lined and flushed rose on outside. Fl. May–Jun.