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Key to Prunella
| 1 Upper leaves pinnatifid; flowers creamy yellow or white (rarely pale blue) |
| 1 Upper leaves entire to obscurely toothed; flowers blue-violet (rarely pink or whitish). |
..2 Principal or median cauline leaves lanceolate to oblong, (2-) avg. 3 (-5)× as long as wide; leaf cuneate at the base |
| ..2 Principal or median cauline leaves ovate to ovate-oblong, (1.5-) avg. 2 (-2.5)× as long as wide; leaf broadly rounded at the base |