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Key to Lamiaceae

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1 Fruit a fleshy drupe; plant a small tree, shrub, or sprawling vine; mature stems terete or obscurely 4-sided (by secondary growth).
  2 Flowers zygomorphic; leaves simple or palmately (3-) 5-7 (-9) foliolate; [subfamily Viticoideae]
  2 Flowers essentially actinomorphic; leaves simple.
    3 Stems pubescent with dendritic hairs; inflorescence axillary; calyx 0.5-2 mm, lobes diminutive to nearly obsolete; [genus incertae sedis]
    3 Stems glabrous or pubescent with simple hairs; inflorescence terminal (rarely only axillary); calyx 5-18 mm, lobes conspicuous; [subfamily Ajugoideae]
1 Fruit a schizocarp of 4 dry mericarps; plant either an herb or a shrub to 5 (-20) dm tall; mature stems usually distinctly 4-sided (sometimes terete or obscurely 4-sided).
      4 Calyx with either a distinctly enlarged protuberance on the upper surface, or the upper lobe expanded and “cap-like”.
        5 Calyx with 5 lobes, clearly separate apically, with the upper lobe expanded and “cap-like”
        5 Calyx with 2 entire lobes joined at the margins, rounded apically, with a distinct protuberance on the upper surface
      4 Calyx without an enlarged protuberance or “cap-like” upper lobe.
          6 Upper lip of corolla greatly reduced or lobes laterally disposed, thus the corolla appearing to consist of one large lower lip; [subfamily Ajugoideae].
             7 Lower lip with 2-4 lobes; flowers yellow or deep blue-purple; plants stoloniferous
             7 Lower lip appearing 5-lobed (proximal 2 lateral, erect lobes represent the cryptic upper lip); flowers white to pink; plants cespitose
          6 Upper lip of corolla conspicuous, flaring or galeate.
               8 Plants distinctly repent and rooting at the nodes, or producing elongate stolons.
                 9 Plants repent.
                   10 Herbs; leaves cordate-reniform, coarsely crenate, the blade > 1 cm long; inflorescence of axillary cymules; corollas 10-20 mm
                   10 Subshrubs; leaves ovate to elliptic, entire, the blade < 1 cm long; inflorescence a terminal thyrse; corollas 4-5 mm
                 9 Plants stoloniferous.
                     11 Inflorescence in dense axillary verticils; calyx and corolla actinomorphic, calyx 4-5-lobed, flowers 3-4 mm long
                     11 Inflorescence terminal; calyx and corolla zygomorphic, calyx 5-lobed, flowers 20-30 mm long
               8 Plants not distinctly repent or stoloniferous.
                       12 Calyx with 6-10 lobes or teeth.
                          13 Calyx zygomorphic, canescent with simple trichomes, spinose lobe tips straight
                          13 Calyx actinomorphic or essentially so, densely pubescent with stellate hairs, spinose lobe tips uncinate
                       12 Calyx with 5 or fewer lobes or teeth.
                            14 Calyx with 3-4 prominent lobes (rarely 5, if one includes small teeth).
                              15 Calyx and corolla essentially actinomorphic
                              15 Calyx and corolla zygomorphic.
                                16 Calyx with 4 unequal primary lobes; flowers large, 2.5-3.5 cm long, in bracteate terminal racemes
                                16 Calyx with 3 primary lobes (upper lobe occasionally with 3 apiculate teeth, e.g. Salvia lyrata); flowers 3 cm or less, in terminal thyrses.
                                  17 Stamens 4; calyx enveloped and partially concealed by subtending bracts
                                  17 Stamens 2; calyx not enveloped by subtending bracts.
                                    18 Shrubs; calyx with simple and dendritic hairs; leaves revolute, coriaceous
                                    18 Herbs; calyx with simple trichomes; leaves non-revolute, margins various, membranaceous
                            14 Calyx usually with 5 prominent lobes (except for Clinopodium with rarely fused upper lobes).
                                       19 Fertile stamens 0-2.
                                         20 Calyx actinomorphic or essentially so; corollas actinomorphic or zygomorphic.
                                           21 Corolla actinomorphic, lobes spreading and nearly equal (one lobe slightly emarginate and/or enlarged).
                                             22 Inflorescences axillary; foliage not or faintly aromatic
                                             22 Inflorescences terminal; foliage strongly aromatic
                                           21 Corolla zygomorphic (bilabiate).
                                               23 Inflorescence in loose terminal and axillary cymules; corollas not galeate or arching
                                               23 Inflorescence densely capitate (often also axillary); corollas strongly galeate, arching
                                         20 Calyx and corollas clearly zygomorphic.
                                                 24 Corolla 7-20 mm; inflorescence a densely clustered terminal or axillary cyme, or a well developed panicle.
                                                    25 Inflorescence a dense cluster of one or more terminal cymules (occasionally just axillary); lower lip of corolla not fringed
                                                    25 Inflorescence a panicle; lower lip of corolla conspicuously fringed
                                                 24 Corolla ca. 3-10 mm long; inflorescence a loose axillary cyme or slender terminal spike or spike-like panicle.
                                                      26 Corolla 3.5-4 mm, borne 2 per node in a slender terminal spike; middle lobe of upper calyx reduced
                                                      26 Corolla 4-10 mm, borne in axillary cymes or spike-like panicle; upper calyx lobes similar.
                                                        27 Flowers in loose axillary cymes; calyx gibbous, throat closed by hairs; corollas ca. 4-5 mm long
                                                        27 Flowers in a spike-like panicle; calyx not gibbous or closed by hairs; corollas ca. 10 mm long
                                       19 Fertile stamens 4.
                                                          28 Stamens ascending under the upper corolla lip, either included within the tube (or at least not clearly exserted beyond it).
                                                            29 Calyx actinomorphic.
                                                              30 Flowers borne in terminal verticils or thyrses, with reduced bracteal leaves.
                                                                 31 Calyx 15-nerved; verticils tightly aggregated
                                                                 31 Calyx 5-10-nerved; verticils well spaced
                                                              30 Flowers borne in axils of well-developed leaves, or a terminal raceme with 1 flower per node.
                                                                   32 Calyx lobes with thickened spinescent apices.
                                                                     33 Stems often with swollen nodes (areas just below appear dark and sunken upon drying, except G. ladanum); hairs of the stem either exclusively hispid or short recurved and mixed with longer glandular trichomes; corolla 15-28 mm long
                                                                     33 Stems without swollen nodes; hairs of the stem finely and softly retrorse, generally lacking glandular hairs (though sessile glands may be present); corolla 5-14 mm long.
                                                                       34 Corolla 5-7 mm long, not much longer than the calyx, weakly bilabiate and lacking an annulus
                                                                       34 Corolla 8-14 mm long and well-exceeding the calyx, strongly galeate and annulate
                                                                   32 Calyx lobes without spinescent apices (although lobes may be pointed or acute).
                                                                         35 Flowers in terminal racemes, corolla tube broadly inflated
                                                                         35 Flowers borne in axils of well developed leaves, corolla tube not broadly inflated.
                                                                           36 Verticils 2-6-flowered, loose; corollas 5-7 mm
                                                                           36 Verticils 6-12-flowered, compact; corollas 10-30 mm.
                                                                              37 Corolla 10-15 mm long; calyx with 10+ nerves
                                                                              37 Corolla 10-30 mm long; calyx 5-nerved
                                                            29 Calyx zygomorphic.
                                                                                38 Shrubs, diffusely branched; [restricted to se. Coastal Plain and Cumberland Plateau]
                                                                                38 Herbs, branched or unbranched; [collectively widespread].
                                                                                  39 Calyx teeth distinctly white or pink, noticeably different from the tube
                                                                                  39 Calyx teeth coloration not noticeably different from the tube.
                                                                                    40 Flowers 1 per bracteal axil.
                                                                                      41 Corolla nearly regular, 4-6 mm long.
                                                                                      41 Corolla bilabiate, >10 mm long
                                                                                    40 Flowers 2-many per bract or leaf axil.
                                                                                        42 Plants lemon-scented, flowers in the axils of well-developed leaves
                                                                                        42 Plants mint-scented or non-aromatic, flowers terminal and/or axillary.
                                                                                           43 Upper median calyx lobe longer and wider than the other 4; flowers terminal
                                                                                           43 Upper lobes differing in sinus depth and/or size from the lower lobes; flowers borne variously.
                                                                                             44 Bracts broadly rounded, apiculate or absent.
                                                                                               45 Bracts broadly rounded, apiculate; inflorescence terminal
                                                                                               45 Bracts wanting; inflorescence axillary
                                                                                             44 Bracts setaceous or elliptic, but not broadly rounded or apiculate, present.
                                                                                                 46 Calyx clearly bilabiate; corollas 7-15 mm long
                                                                                                 46 Calyx scarcely bilabiate; corollas 5-7 mm long
                                                          28 Stamens (at least some) well exserted beyond the upper corolla lobe.
                                                                                                   47 Lower lip of corolla distinctly fringed
                                                                                                   47 Lower lip of corolla not fringed.
                                                                                                     48 Calyx zygomorphic.
                                                                                                        49 Flowers in dense terminal capitate clusters, subtended by large bracteal leaves (these often whitened on the upper surface and especially towards the base)
                                                                                                        49 Flowers borne otherwise.
                                                                                                          50 Flowers borne in few-flowered cymose axillary clusters, overall appearing paniculate; [subfamily Ajugoideae]
                                                                                                          50 Flowers borne in a spike-like terminal thyrse.
                                                                                                            51 Corolla pink to lavender or white, 11-17 mm long
                                                                                                            51 Corolla blue (rarely white), 7-12 mm long
                                                                                                     48 Calyx actinomorphic.
                                                                                                              52 Flowers borne in a dense terminal spike, 2-3-verticilled globose head, or spiciform thryse.
                                                                                                                53 Inflorescence secund
                                                                                                                53 Inflorescence terete.
                                                                                                                  54 Small plants to ca. 30 cm; leaves short, sessile, linear- lanceolate with revolute, entire margins; [endemic to FL and se. GA]
                                                                                                                  54 Large plants, well over 30 cm tall; leaves often petiolate, broadly ovate or lanceolate, margins not revolute or entire; [collectively widespread].
                                                                                                                     55 Bracts broadly rounded; corolla distinctly bilabiate; plants 1-3 m tall
                                                                                                                     55 Bracts linear-lanceolate; corolla nearly regular; plants < 1 m tall
                                                                                                              52 Flowers borne in axillary verticils or terminal (capitate to loosely flowered) clusters.
                                                                                                                       56 Flowers in axillary clusters, corolla nearly regular.
                                                                                                                         57 Axillary clusters loose, 1-3-flowered; [subfamily Ajugoideae]
                                                                                                                         57 Axillary clusters dense, many-flowered; corolla white-pink
                                                                                                                           58 Stems scabrous; corolla mostly blue-violet
                                                                                                                           58 Stems glabrous to pubescent; corolla mostly white-pink
                                                                                                                       56 Flowers in densely capitate or loosely flowered terminal clusters, corolla distinctly bilabiate.
                                                                                                                             59 Flowers in loosely branched terminal and axillary cymes
                                                                                                                             59 Flowers densely capitate cluster or terminal spike of well spaced verticils.
                                                                                                                               60 Inflorescence either capitate or a spike, not subtended by large bracteal leaves
                                                                                                                               60 Inflorescence capitate, subtended by large bracteal leaves (these often whitened on the upper surface and especially towards the base)

Key I: woody plants with opposite, compound leaves

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1 Leaves 2-3-foliolate.
  2 Leaves 2-foliolate, with a branched tendril in the terminal position (this sometimes not developed, or withered); liana
  2 Leaves 3-foliolate, lacking tendrils; shrub, liana, or tree.
    3 Upright shrub or tree.
      4 Leaflets entire, glandular-dotted; [n. FL southwards
      4 Leaflets serrate or serrulate, not glandular-dotted; [collectively widespread].
        5 Leaflets 3-5 (-7), coarsely and jaggedly serrate, with < 5 teeth per leaflet side; fruit a schizocarp of 2 samaroid mericarps (maple “keys”)
        5 Leaflets 3, evenly serrulate, with > 10 teeth per leaflet side; fruit an inflated capsule
    3 Liana or sprawling shrub.
          6 Flowers yellow with fused petals; stems stiff, green
          6 Flowers either white, radially symmetrical, with separate petaloid sepals (Clematis), or blue, bilaterally symmetrical, with fused petals (Vitex).
             7 Leaves 3-more-foliolate; flowers white, radially symmetrical, uniseriate, with white petaloid sepals and no petals
             7 Leaves 1 (-3) foliolate; flowers blue, bilaterally symmetrical, biseriate, with green calyx and blue corolla
1 Leaves 4-15-foliolate.
               8 Leaves palmately compound.
                 9 Leaflets serrate; flowers white, yellow, or red; fruit a leathery capsule, irregularly spheroidal, 2-9 cm in diameter, with 1-3 (-6) large seeds, each with a large pale hilum contrasting with the dark brown color of the rest of the seed
                 9 Leaflets entire; flowers blue, pink, or purple; fruit either a 4-seeded drupe, < 0.5 cm in diameter, or an elongated capsule, 8-10 cm long and ca. 0.7 cm in diameter.
                   10 Leaflets < 3× as long as wide, broadly rounded at the tip; fruit an elongated capsule, 8-10 cm long and ca. 0.7 cm in diameter [peninsular FL]
                   10 Leaflets > 4× as long as wide, acute at the tip; fruit a 4-seeded drupe, < 0.5 cm in diameter; [widespread in our region]
               8 Leaves pinnately compound, bipinnately compound, or more complexly compound.
                     11 Plant a liana (woody vine).
                       12 Leaves pinnately compound, with 7-15 coarsely serrate leaflets; perianth biseriate, with a green synsepalous calyx and an orange sympetalous corolla; fruit an elongate capsule, with many winged seeds; stems to 20 cm in diameter, with tan bark
                       12 Leaves either pinnately compound, the leaflets 3-7 and coarsely serrate, or more complexly compound, the leaflets 5-many, not serrate though often lobed; perianth uniseriate, with a white, pink, or purplish aposepalous calyx and no corolla; fruit an aggregate of plumose achenes; stems to 1 cm in diameter, brown or green
                     11 Plant a tree or shrub, with stiff branches.
                          13 Leaves 3-7-foliolate and strictly 1-pinnate; leaflets with a few very coarse teeth; 1st year stems green; fruit a pair of winged, asymmetrical samaroid mericarps
                          13 Leaves 3-15-foliolate, 1-pinnate or partially 2-pinnate; leaflets evenly serrate with many teeth or entire; 1st year stems tan to brown (very new growth may be green); fruit either a symmetrical (winged) samara (Fraxinus) or a purplish-black, many-seeded berry (Sambucus).
                            14 Fruit a purplish-black or red, 4-seeded berry (Sambucus); plant a shrub or small tree; stems hollow or pithy; petiole prominently grooved on the upper side; fresh leaves somewhat fleshy in texture
                            14 Fruit either a green or tan, symmetrical (winged) samara or a blackish 5-seeded dryish drupe; plant a small to large tree; stems solid and woody; petiole nearly round in ×-section (not grooved); fresh leaves membranaceous or coriaceous in texture.
                              15 Fruit a symmetrical samara; axillary buds suprapetiolar (though sometimes almost hidden within the strongly U-shaped petiolar attachment; [common native (also planted)]
                              15 Fruit a nearly spherical 5-seeded dry drupe; axillary buds infrapetiolar (hidden by the swollen petiole base; [rarely escaped exotic]