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Key to Leonurus

Lamiaceae

Leonurus

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1 Calyx strongly 5-angled, the lower 2 lobes deflexed; upper corolla lip white-villous; leaves lacerately toothed and the larger shallowly lobed
1 Calyx slightly 5-angled, no lobes notably deflexed; upper corolla lip with densely and finely puberulent; leaves either entire to few-toothed (but not lobed) or deeply 3-parted, the 3 divisions further lacerately toothed or lobed.
  2 Leaves deeply 3-parted, the 3 divisions further lacerately toothed or lobed