Biennial, 4-11 dm, simple to the infl; basal lvs grass- like, linear or nearly so, acuminate, 3-12 cm, persistent in a rosette, the cauline similar but shorter; infl much branched, 6-20 cm wide, the numerous racemes 1-3, 1 cm thick, pedicels 1-2 mm; fls yellow, drying green; wings abruptly cuspidate, 2-4 mm, surpassing the cor; keel inflexed at the tip; fr didymous; seeds glabrous; 2n=64, 68. Acid sandy marshes and wet pine-barrens; Del. to Fla. and La. June-Aug. (Pilostaxis c.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.