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Lamiaceae Taxonomy Browser
Plectranthus thyrsoideus (Baker) B.Mathew
Shrubby perennial herb, up to 90 cm tall. Stems petioles and inflorescence sparsely covered with spreading hairs. Leaves opposite, lowermost largest, up to 17 × 10 cm, ovate-cordate, bright green above, paler beneath with veins prominent, pubescent; lamina decurrent into the c. 2 cm long petiole; margin coarsely toothed. Leaves gradually smaller towards the top of the branches. Inflorescences terminal on the branches, up to 25 cm long, shortly branched, each branch with dense 10-15 flowered dichotomous cymes. Calyx small, with spreading stellate hairs; dorsal sepal linear-oblong, twice as long as other sepals. Corolla 2-lipped, bright blue, 1.2-1.5 cm long. Upper lip reflexed, broadly obovate, with 4 short rounded lobes; lower lip distinctly longer, saccate, laterally compressed, pointed at the apex.
Malawi, Mozambique, Zambia?, Zimbabwe.