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All such apparent explanations are now slowly becoming antiquated and obsolete, but the cases adduced by Kerner seem to stand this test. Kerner designates a willow, Salix ehrhartiana as a constant hybrid between Salix alba and S. pentandra.
RHUS Cotinus. VENUS'S SUMACH. The bark of the stalks produces a yellow colour; the bark of the roots produces a red. RHUS coriaria. ELM-LEAVED SUMACH. This plant is possessed of the same qualities as the one above. RUBIA tinctorum. The root produces a red colour. For its culture, see p. 32. RUMEX maritima. DOCK. The whole herb gives out a yellow colour. SALIX pentandra.
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