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Standard Cyclopedia of Horticulture
Brunella (probably from old German breune or braune, quinsy, which it was thought to cure). Often written Prunella, which was the spelling used by Linnaeus. Brunella is pre-Linnsean. Labiatae. Low-growing hardy herbaceous perennials.
Flowers usually violet or purple, produced all summer on heads an inch or more high or in bracted spikes; calyx reticulate about 10-nerved and 2-lipped, which distinguishes it from the closely related Physostegia, in which the calyx is almost regular.
They are best suited for the rockery and slightly shaded parts of the border, succeeding in almost any soil that is not excessively dry.
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