an aquatic herb suspended in the water by means of a whorl of floats on the peduncle; stolons up to more than 1 ft. long, filiform to 2/3 lin. in diam.; leaves heteromorphic; foliage leaves from a few lines to more than 1/2 in. apart, rarely subopposite, 4–6-partite, usually auricled, rays 1/2–1 1/2 in. long, compound-pinnate, midrib finely filiform to linear (up to more than 1/2 lin. broad); pinnæ 2–5 lin. long, segments capillary, minutely setose, with or without bladders, auricles orbicular-cordate in outline, 1–2 1/2 lin. in diam., fringed or deeply and repeatedly divided, fringes or segments finely subulate and rather rigid, rigidly ciliate with the cilia usually in bundles of 2 or 3, or the segments (in cases of extreme division) running out into capillary flexuous minutely setose threads; bladders usually only 1 or 2 on each pinna, obliquely globose-ovoid, 3/4–1 lin. in diam., mouth truncate, oblong, naked (always?); floats in whorls of 4–6 (rarely fewer or more), usually 3–6 lin. below the lowest flower, broad-ellipsoid to ovoid, 2 1/4–4 lin. long, with some reduced short pinnæ near the apex; raceme few to 12-flowered; peduncle 1–9 in. long, slender; bracts broad-ovate, obtuse, 3/4–1 lin. long; bracteoles 0; pedicels 1–1 1/2 lin. long (rarely more), filiform and obliquely erect during flowering, then gradually recurving, at last up to 3 lin. long and more or less thickened below the calyx; sepals subequal, ovate-orbicular or orbicular, subobtuse to rounded, 1–1 1/2 lin. long; corolla yellow, 2–2 1/2 lin. long; upper lip rotundate-ovate, up to 1 1/2 lin. long; lower lip subquadrate, over 2 lin. long, palate very large and gibbous; spur subcylindric, stout, obtuse, adpressed to the lower lip, up to 2 lin. long; anthers patelliform when open, 1/6 lin. long; filaments filiform, narrowly winged, 3/8 lin. long; ovary globose; style short but distinct, upper stigmatic lip 0, lower truncate-rotundate; capsule globose, 2–2 1/2 lin. in diam.; seeds prismatic, 4–5-angled, 1/3– 3/8 lin. across, 1/8– 1/10 lin. high, top face finely reticulate, angles narrowly winged; embryo not differentiated. null
