Monarda

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  M. punctata

  1a. Inflorescence consisting of 2–5 separate verticillasters of flowers (or a solitary verticillaster in depauperate plants); corolla yellow with red-purple spots, the upper 
lip strongly arcuate; stamens not exserted beyond the upper corolla lip; leaf blades 
(5–) 10–15 (–20) mm wide
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  1b. Inflorescence consisting of a single terminal verticillaster of flowers (sometimes with a second verticillaster below the terminal one) [Fig. 701]; corolla pink to purple, red, red-purple, or white to ochroleucous, unspotted or spotted, the upper lip straight or slightly curved; stamens exserted beyond the upper lip by (1–) 2–4 mm; leaf blades (8–) 15–80 mm wide
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    M. didyma

    2a. Corolla 30–45 mm long, red (rarely red-purple), not long-villous near the apex of the upper lip (though minute hairs may be present); bract blades usually deeply tinged with red; leaf blades 7–15 cm long, borne on petioles 10–40 mm long
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    2b. Corolla 15–35 mm long, pink to purple, red-purple, or white to ochroleucous, long-villous near the apex of the upper lip or not; bract blades green or tinged with white, gray, or purple; leaf blades 6–12 cm long, borne on petioles 10–20 (–30) mm long
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      M. fistulosa

      3a. Corolla light purple (rarely purple to red-purple or white), softly puberulent on the abaxial (i.e., outer) surface as well as densely villous near the apex of the upper lip with hairs that have pale septa; calyx densely hirsute within with erect hairs ⅓ to ½ as long as the calyx lobes (short-villous within in var. rubra); leaf blades lanceolate or triangular-lanceolate to narrow-ovate, (8–) 15–38 mm wide
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      3b. Corolla red-purple or white to ochroleucous (rarely pink), glabrous or softly puberulent on the abaxial surface, not or only sparsely villous near the apex of the upper lip with hairs that have red-purple septa; calyx glabrous within or sparsely 
villous with hairs shorter than ⅓ the length of the calyx lobes; leaf blades broad-lanceolate to ovate or triangular-ovate, 20–60 (–75) mm wide
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        M. media

        4a. Corolla red-purple, unspotted, minutely puberulent on the abaxial surface and usually the upper lip sparsely villous with hairs that have red-purple septa; upper lip of corolla 13–16 mm long; bract blades tinged or completely suffused with purple
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        M. clinopodia

        4b. Corolla white to ochroleucous and spotted with purple on the lower lip (rarely the corolla pink), glabrous or minutely puberulent on the abaxial suface, the upper lip without long, villous hairs; upper lip of corolla 5–8 mm long; bract blades often tinged with white

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