Perennial, subacaulescent or to 5 dm, decumbent to erect, silky-strigose; lvs linear-lanceolate, 5–10 cm, acute or acuminate, entire or nearly so, narrowed to a long petiolar base; fls few, subsessile in the axils; hypanthium slender, 7–10 cm; sep lance-linear, 2–4 cm, spreading unilaterally at anthesis and persistently connivent; pet yellow, obovate, 5–7 cm; fr 4–7 cm, slender, 4-sided, the angles bearing semi-elliptic wings 1–2.5 cm wide. Dry rocky barrens in calcareous soil; s. Ill. and Mo. to Nebr. and Colo., s. to Tex. May–July. (O. missouriensis; Megapterium missouriense)
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