Triodanis leptocarpa (Nutt.) Nieuwl.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Simple or basally branched, 1–8 dm, often floriferous to near the base, scabrous or shortly spreading-hairy at least below; lvs sessile, lanceolate or oblanceolate to lance-elliptic, or the upper (floral) ones linear, inconspicuously crenate or subentire, mostly 1.5–3.5 cm × 2–7 mm and 5–10 times as long as wide, the lowest ones short-petiolate and a little broader; cal divided to the hypanthium, the narrow lobes 6–15 mm, or smaller in the cleistogamous fls; upper fls with blue-violet cor 7–10 mm, the tube scarcely 2 mm; fr linear, those of the cleistogamous fls 8–15 mm and unilocular, those of the open fls 15–25 mm and often bilocular; seeds 0.7–1.0 mm. Dry open places; s. Minn. to Mont., s. to Ark. and Tex.; adventive in Ind. May, June. (Specularia l.)