Stems clustered on a taproot, ± erect, 3–9 dm, branching, usually hollow, glabrous or nearly so, amply leafy; stipules free; lfls 11–23, oblong to elliptic or obovate, 1–3 cm, strigose beneath; racemes several, each scarcely surpassing the subtending lf, with 10–20 white or chloroleucous fls 11–15 mm; cal-tube cylindric, 4–5 mm, the lobes half as long; fr erect, sessile, straight, fusiform or obliquely ovoid, inflated, 1.5–2 cm × 8–18 mm, glabrous, the sutures scarcely sulcate; 2n=22. River-banks and lake-shores, especially on limestone; irregularly from c. N.Y. and se. Ont. to Sask.; N.D., and S.D.; Grant Co., W.Va., and Alleghany Co., Va. June. (A. cooperi; Phaca n.)
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