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Lamium
purpureum f. albiflorum, a white form of its original
species, is a biennial herb rarely found in the country. Its
stems are square and grow to 10- 25 cm in height. Leaves are
opposite, 1.5-3 cm long, circular-ovate, with obtuse serrations
on the margins and prominent small veins forming a surface
network. The leaves on the upper portion are dense. Labiate
flowers, about 1cm long, are closely spaced in the leaf axils.
Bloom time: April- May.
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