. Slender annual with several or many prostrate or ascending stems to 20 cm; lvs essentially all cauline, linear, to 6 cm × 5 mm, the lower 1–4 pairs opposite; stems terminating in an elongate, loosely fld false raceme or spike that may be irregularly bracteate below; cal 2–4 mm in fr; cor small, the limb mostly 1–2 mm wide; nutlets ovate or lance-ovate, 1.5–2.2 mm, usually roughened, with a small, basilateral scar; 2n=54. Widespread in w. U.S. and Can., casually intr. here and there in our range. May–Aug. Ours is var. penicillatus (Greene) Cronquist.
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