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Key to Arenaria

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1 Leaves lanceolate to oblanceolate, (7-) 15-32 mm long, 2-8 (-14) mm wide; perennial; seeds shiny, smooth, 0.7-0.8 mm long
1 Leaves ovate or elliptic-lanceolate to oblanceolate, 3-15 (-20) mm long, 1-4 mm wide; annual; seeds ashy, minutely or prominently tuberculate, 0.4-0.6 mm long.
  2 Stems puberulent in 2 lines; leaf blades 1-veined; sepals 1-veined, glabrous; [native, OK and nw. LA westward]
  2 Stems uniformly puberulent; leaf blades 3-5-veined; sepals 3-veined, stipitate-glandular; [non-native, collectively widespread].
    3 Fruiting calyx lobes papillate (at 40× magnification); capsule nearly straight-sided, nearly as wide near the top as at the base
    3 Fruiting calyx lobes not papillate (at 40× magnification); capsule ovoid, distinctly broader at the base
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