whorls of tiny blue to violet flowers on spike, dark green oval shaped leaves, herbaceous perennial
Near river. Shaded area, leaves palmately lobed, calyx glabrous. Corolla of mature flower ~1cm. Sorry for the poor picture of the flower. Stems green-red. I lost my hand lens on this trip :(
Leaves opposite. Flowers 5-merous. Petals fused for 1/2 the length of the corolla. Corolla ~6mm.