Monographs Details: Spilanthes americana (Mutis) Hieron.
Authority: Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Description:Species Description - Subglabrous to hirsute perennial, the stems weak, often rooting at the lower nodes, 2–6 dm; lvs ovate or lanceolate, 2.5–8 × 0.5–3 cm, on petioles 0.5–2 cm; heads few on naked peduncles, the disk 5–9 mm wide, elongating conspicuously in fr; rays several, yellow, 3- toothed, 3–10 mm; receptacle narrowly conic; pappus of 1 or 2 very short awns, or none. 2n=52. Woods and moist or swampy places; tropical Amer., n. to S.C., s. Ill., and Mo. June–Oct. (S. repens)