Stem erect, 4–8 dm, bearded at the nodes and usually sparsely spreading-bristly on the angles; lvs subsessile, narrowly oblong, 3–7 cm, acute or acuminate, sharply serrate, usually acute at base, glabrous; bracts ovate or lance-ovate, denticulate and sparsely ciliate; cal-tube 3–4 mm, glabrous or commonly sparsely villous, the lobes glabrous, deltoid, 2.3–3.4 mm, more than half as wide. Moist soil; Pa. to Io., s. to Ga. and Mo. July–Sept. (S. hyssopifolia var. ambigua; S. ambigua (A. Gray) Britton, not Sm.; S. grayana)
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