| General Information |
| Distribution | Native to North and Central America and temperate Europe and Asia.In the Hawaiian Islands,
naturalized on
Moloka`i, Maui, Hawai`i.
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Habit
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Perennial herbs from a caudex or short rhizome; stems erect, decumbent, or occasionally prostrate, sometimes rooting at the nodes, 1-5 dm long, villous-puberulent, sometimes glabrate.
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Leaves
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Leaves lanceolate, elliptic, or ovate, 2-9 cm long, 0.7-4 cm wide, both surfaces sparsely scabrid, margins subentire to remotely crenulate, apex acute, base broadly cuneate to truncate, petioles usually 1-2 cm long.
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Flowers
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Inflorescences 2-5 cm long, usually ca. 1.5-2 cm in diameter, bracts suborbicular to very broadly ovate, usually 7-10 mm long, apex abruptly short-acuminate, margins ciliate; calyx green or purple, 7-10 mm long; corolla blue or violet, occasionally pink or white, 8-16 mm long.
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Chromosomes
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2n = 14, 21, 28, 32, 42, 56
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