Fls in dense, elongating, pedunculate axillary spikes; bracts small, cuneate-obovate to flabelliform; cal small, membranous, often compressed or even winged, with 2 or 4 teeth or segments; cor-tube very slender, straight or incurved, slightly exserted from the cal, the limb oblique, spreading, 4-parted and somewhat 2-lipped; stamens 4, paired, included or slightly exserted; anthers unappendaged; ovary with 2 uniovulate chambers; stigma thickened, oblique or recurved; fr included in the cal or even adnate to it, dividing into 2 nutlets, sometimes with separating thin exocarp; prostrate or creeping perennials with ±ascending or trailing branches, ±canescent with malpighian hairs. 10, originally N. Amer.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.