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Lamium
See list of 5 species in this genusReference: Mennama (1989).
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1a. Corolla yellow; lower lip of the corolla with three evident lobes (i.e., the lateral lobes well-developed and nearly as long as the middle lobe); anthers glabrous
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1b. Corolla white to pink to purple; lower lip of the corolla with a prominent middle lobe that is much larger than the reduced or wanting lateral lobes; anthers pubescent
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2a. Corolla (18–) 20–35 mm long, with an upper lip 7–14 mm long, the basal, connate portion curved at the base [Fig. 695]; plants perennial from rhizomes
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3a. Corolla pink to brown-purple (rarely white), with a ring of spreading hairs on the adaxial (i.e., inside) surface 2–3 mm from the base; leaf blades commonly with a white blotch bordering each side of the midrib; terminal tooth of the upper leaf blades usually obtuse at the apex; pollen orange
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3b. Corolla white (rarely pink), with a ring of backward pointing hairs on the adaxial surface 4–5 mm from the base; leaf blades without a white blotch; terminal tooth of the upper leaf blades acute at the apex; pollen light yellow
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2b. Corolla 10–20 (–25) mm long, with an upper lip 3–5 mm long, the basal, connate portion straight; plants annual, without rhizomes
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4a. Upper leaves and bracts sessile and clasping; calyx lobes erect (i.e., oriented straight forward); flowers without a subtending bractlet; connate portion of the corolla (i.e., the tube) glabrous on the inner surface
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4b. All the leaves petiolate, the upper bracts sessile but not clasping; calyx lobes spreading; flowers commonly with a subtending bractlet; connate portion of the corolla sometimes pubescent on the inner surface
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Each photo represents one species in this genus.