an amphibious herb, floating in stagnant water or creeping on mud; stolons up to 1/2 ft. long, branched, sometimes matted into cushions, very slender, glabrous; leaves all alike, 1–3 lin. apart, 3–5-partite, 1–3 lin. long, divisions multifid, ultimate segments 5–8, capillary, glabrous, terminated by a short fine bristle; bladders very conspicuous, replacing a leaf division or more often a basal segment, 1 or 2, rarely 3 with each leaf, obliquely ovoid, up to 2 lin. long, often purple, mouth sublateral, delicately fimbriate, some of the fimbriæ often fused at the base, stalk very short; peduncles 3/4–1 in. long, slender, with a single broad-oblong obtuse or emarginate bract 1 lin. long, 2–8 lin. below the solitary flower; sepals equal, ovate-rotundate or broad-elliptic, obtuse, 1 lin. long; corolla yellow, 4–4 1/2 lin. long; upper lip ovate, entire or crenulate at the apex, not quite 2 lin. long; lower lip broad-rotundate, slightly and broadly 2-lobed, sides deflexed, 3–4 lin. long, palate large, slightly 2-gibbous; spur broad-conic, obtuse, 2 1/2–3 lin. long; filaments linear; anthers 1/4 lin. long; style very short; upper stigmatic lip obscure, lower rotundate; mature capsule and seeds unknown. null
