Resembling no. 10 [Utricularia vulgaris L.], but much smaller; lvs 1–2 cm, usually with little trace of a central rachis; flowering branches 5–15 cm, without scales below the bracts; bracts 2–3 mm; pedicels to 8 mm, arched-recurving in fr; petaliferous fls with the lower lip 6–8 mm, somewhat surpassing the upper; spur not or scarcely falcate; cleistogamous fls without cor, solitary on pedicels 5–15 mm, often along the leafy submersed stems; peduncle naked. Quiet water; Nf. and Que. to n. Mich. and n. Wis., s. to Pa. and e. Va. July, Aug. (U. clandestina)
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