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Key to Ocimum

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1 Calyx with a dense ring of hairs at throat (annulate), lower lobes deltoid-attenuate; corolla white to lavender, (5-) 6-12 mm long, strongly exserted beyond calyx, lower lobe toothed, hirtellous, annulate; anthers > 1 mm long; mericarps black-brown, strongly mucilaginous
1 Calyx short stipitate-glandular at throat (non-annulate), lower lobes setaceous; corolla purplish, 4-5 mm long, barely exserted beyond calyx, lower lobe nearly entire, puberulent, non-annulate; anthers < 1 mm long; mericarps red-brown, weakly mucilaginous or not