Utricularia spiralis Sm.

Terrestrial herb.. Rhizoids and stolons capillary, numerous from the base of the scape.. Leaves few, usually decayed at anthesis, leaf-opposed on the stolons, linear, up to 5 cm. long and 2.5 mm. wide, 1–3-nerved.. Traps numerous, globose, shortly stalked, glandular, 0.6–1.0 mm. long; mouth basal; upper lip with 2 simple subulate appendages.. Inflorescence erect or usually twining, 5–50 cm. high; scape filiform, glabrous; flowers 1–15, usually distant; scales few, similar to the bracts; bracts basifixed, broadly ovate, ± 2 mm. long; bracteoles linear-lanceolate, usually shorter than the bracts; pedicels erect or ascending, 3–6 mm. long at anthesis, up to 15 mm. long in fruit, flattened or ± narrowly winged, always longer than the fruiting calyx.. Calyx-lobes subequal, ovate to narrowly ovate, apex of upper acute, of lower minutely bidentate.. Corolla usually violet with a dark blue, greenish, yellow or white spot in the throat, rarely wholly yellow or white, 5–30 mm. long; upper lip narrowly oblong to orbicular; lower lip orbicular; palate raised; spur usually curved, acute or rarely obtuse.. Filaments linear; anther-thecae subdistinct.. Ovary ovoid; style indistinct; stigma-lips short, truncate, subequal.. Capsule narrowly ovoid, dehiscing by a longitudinal abaxial slit; capsule-wall of uniform thickness.. Seeds numerous, globose, 0.2–0.3 mm. in diameter; testa thin, cells distinct, ± isodiametric.