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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).
............ ............ ............ ..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
............ ............ ............ ............ ......28 Stamens ascending under the upper corolla lip, either included within the tube (or at least not clearly exserted beyond it).
............ ............ ............ ............ ..........30 Flowers borne in terminal verticils or thyrses, with reduced bracteal leaves.
............ ............ ............ ............ ..........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 6-12-flowered, compact; corollas 10-30 mm.
............ ............ ............ ............ ............ ............ ..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.
............ ............ ............ ............ ............ ............ ..........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 setaceous or elliptic, but not broadly rounded or apiculate, present.
............ ............ ............ ............ ......28 Stamens (at least some) well exserted beyond the upper corolla lobe.
............ ............ ............ ............ ............ ............ ............ ............ 49 Flowers in dense terminal capitate clusters, subtended by large bracteal leaves (these often whitened on the upper surface and especially towards the base)
............ ............ ............ ............ ............ ............ ............ ............ ..50 Flowers borne in few-flowered cymose axillary clusters, overall appearing paniculate; [subfamily Ajugoideae]
............ ............ ............ ............ ............ ............ ............ ............ ......52 Flowers borne in a dense terminal spike, 2-3-verticilled globose head, or spiciform thryse.
............ ............ ............ ............ ............ ............ ............ ............ ..........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].
............ ............ ............ ............ ............ ............ ............ ............ ......52 Flowers borne in axillary verticils or terminal (capitate to loosely flowered) clusters.
............ ............ ............ ............ ............ ............ ............ ............ ............ ..56 Flowers in densely capitate or loosely flowered terminal clusters, corolla distinctly bilabiate.
............ ............ ............ ............ ............ ............ ............ ............ ............ ..........60 Inflorescence capitate, subtended by large bracteal leaves (these often whitened on the upper surface and especially towards the base)

Key J2: woody angiosperms with opposite, simple leaves with toothed margins {add [Abelia] CAPRIFOLIACEAE}

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1 Leaves evergreen.
..2 Plant a shrub, erect, not requiring support.
....3 Leaves with spiny margins
....3 Leaves with crenate or serrate margins.
......4 Leaves slightly to strongly fleshy; inflorescence a head; [maritime situations]
 Iva
......4 Leaves not fleshy; inflorescence either a head or otherwise; [collectively widespread].
........5 Leaves > 8 cm long, typically spotted with yellow, coarsely toothed; fruit a red drupe; [commonly cultivated, rarely seeding down nearby]
........5 Leaves < 8 cm long, not yellow-spotted, serrulate; fruit a capsule or purplish drupe; [plants native or cultivated].
..........6 Inflorescence a head; [s. FL]
..........6 Inflorescence otherwise; [more widespread].
............ 7 Corolla tubular, campanulate, bilaterally symmetrical; fruit a 1-seeded achene (rarely produced)
............ 7 Corolla radially symmetrical, with 4-5 distinct petals; fruit a 2-10-seeded capsule or drupe.
............ ..8 Fruit a 4-5-locular capsule, with 2 seeds per locule (though often fewer by abortion)
............ ..8 Fruit a (2-) 3-locular, purplish-black drupe, with (2-) 3 single-seeded stones
..2 Plant a subshrub, creeping shrub, or liana.
............ ....9 Leaves spinose-serrate; [exotics, rarely naturalized]
............ ....9 Leaves serrate (not spinose), serrulate, or crenate; [exotics and natives, collectively widespread].
............ ......10 Leaves slightly to strongly fleshy; inflorescence a head; [maritime situations]
 Iva
............ ......10 Leaves not fleshy; inflorescence otherwise; [collectively widespread].
............ ........11 Leaves on vigorous shoots with a few coarse rounded teeth towards the base (most leaves entire)
............ ........11 Leaves serrulate to serrate, the teeth uniformly around the margin or concentrated towards the tip; fruit dry, either indehiscent and 1-seeded or capsular and with several seeds.
............ ..........12 Flowers 5-merous; petals fused; fruit indehiscent, 1-seeded; [montane, from e. TN, WV, and w. MD northwards in our area]
............ ..........12 Flowers 4- or 5-merous; petals separate; fruit capsular, dehiscent, several-seeded; [collectively widespread in our area]
1 Leaves deciduous.
............ ............ 13 Leaves slightly to strongly fleshy; inflorescence a head, subtended by an involucre of phyllaries; [maritime situations]
 Iva
............ ............ 13 Leaves not fleshy; inflorescence, flower, and fruit structure various, but not with the combination of features as above (sometimes the flowers in a head subtended by bracts, but then with other features differing, such as stamens 4, or green calyx present, or petals separate, or fruit a schizocarp of mericarps, etc.); [collectively widespread].
............ ............ ..14 Lianas climbing by twining or by adventitious roots.
............ ............ ....15 Stems with retrorse prickles; foliage scabrous
............ ............ ....15 Stems not prickly; foliage smooth to variously hairy, but not scabrous.
............ ............ ......16 Leaves on vigorous shoots with a few coarse rounded teeth towards the base (most leaves entire), the larger leaves < 3 cm wide; lianas climbing by twining; fruit a fleshy berry; flowers 5-merous, with a fused, tubular corolla
............ ............ ......16 Leaves serrate, the teeth towards the leaf apex, the larger leaves > 4 cm wide; lianas climbing by adventitious roots; fruit a capsule; flowers 7-10-merous, with separate petals
............ ............ ..14 Upright shrubs or trees, lacking any adaptations for climbing.
............ ............ ........17 Trees; leaves often a mix of alternate and opposite.
............ ............ ..........18 Leaves harshly scabrous on the upper surface; fruit a multiple of achenes; leaf venation pinnate but irregular
............ ............ ..........18 Leaves not scabrous; fruit a 2-4-seeded drupe; leaf venation neatly pinnate, the lateral veins nearly straight and parallel to one another
............ ............ ........17 Shrubs or trees; leaves strictly opposite (or often a mix of alternate and opposite in RHAMNACEAE).
............ ............ ............ 19 Trees; leaves palmately-veined, with 5 or more veins from the base; [rarely naturalizing]
............ ............ ............ 19 Shrubs; leaves either triple-veined from near the base or pinnate-veined; [collectively widespread and common]
............ ............ ............ ..20 Leaves strongly triple-veined from at or near the base of the blade, the 2 lateral veins arching towards the tip and rejoining the midvein or nearly so (becoming diffuse before rejoining); petals 4, white; stamens 15-90
............ ............ ............ ..20 Leaves pinnate-veined; petals various, not both 4 and white (except sometimes in Hydrangea); stamens 1-15 (except 15-30 in Exochorda in ROSACEAE).
............ ............ ............ ....21 Inflorescence head-like; flowers sympetalous and 4-lobed; fruit 2 seeded
............ ............ ............ ....21 Inflorescence more diffuse, with internal axes and pedicels; flowers not both sympetalous and 4-lobed (except in Forsythia and Buddleja); fruit 1-seeded, 2-4-seeded, or 4-many-seeded.
............ ............ ............ ........23 Corolla absent; flowers inconspicuous and small, in axillary fascicles or catkins.
............ ............ ............ ..........24 Flowers in catkins; leaves usually a mix of opposite and alternate
............ ............ ............ ..........24 Flowers in axillary fascicles; leaves strictly opposite (subopposite)
............ ............ ............ ........23 Corolla present; flowers larger, in terminal cymes, corymbs, racemes, panicles, or in axillary cymes or fascicles.
............ ............ ............ ............ 25 Petals separate; stamens 8-10 (-60) (or 4-6 in RHAMNACEAE and Euonymus in CELASTRACEAE).
............ ............ ............ ............ ..26 Flowers 1-few, in axillary cymes; stamens 4-6; stems brown, tan, gray, or green.
............ ............ ............ ............ ....27 Leaf venation pinnate, but irregular and reticulated; stems green
............ ............ ............ ............ ....27 Leaf venation neatly pinnate, the lateral veins nearly straight and parallel to one another; stems brown, tan, or gray
............ ............ ............ ............ ..26 Flowers 1 and terminal, or many, in terminal panicles or corymbs; stamens 8-10 (-60); stems brown, tan or gray.
............ ............ ............ ............ ......28 Inflorescence a solitary, terminal flower; stamens 30-60
............ ............ ............ ............ ......28 Inflorescence a terminal panicle or corymb; stamens 8-15
............ ............ ............ ............ 25 Petals fused, at least basally, and often strongly tubular; stamens 2, 4, or 5.
............ ............ ............ ............ ..........30 Petals white, fused basally only, the lobes spreading
............ ............ ............ ............ ..........30 Petals pink, yellow, or reddish, fused for most of their length
............ ............ ............ ............ ............ 31 Stamens 2; petals yellow; flowers radially symmetrical; inflorescence an axillary fascicle
............ ............ ............ ............ ............ 31 Stamens 4; petals white, pink, or lavender; flowers bilabiate; inflorescence a terminal thyrse or panicle or an axillary cyme.
............ ............ ............ ............ ............ ..32 Petals 5; inflorescence a terminal panicle or an axillary cyme.
............ ............ ............ ............ ............ ......34 Fruit a berry, drupe, or achene, indehiscent, fleshy at maturity (or dry in Kolkwitzia).
............ ............ ............ ............ ............ ............ ..38 Foliage with stellate hairs; fruit a pink-purple 4-seeded drupe
............ ............ ............ ............ ............ ............ ..38 Foliage glabrous or with simple hairs; fruit a dark red, black, or blue 1-4-seeded drupe.
............ ............ ............ ............ ............ ............ ......40 Inflorescence a catkin, the flowers small (< 5 mm in diameter) and tightly arranged on the inflorescence axis (> 5 per cm of the axis)
............ ............ ............ ............ ............ ............ ......40 Inflorescence various, but more diffuse, the flowers larger (> 5 mm in diameter, except for some flowers in Hydrangea in HYDRANGEACEAE) and loosely arranged (< 5 per cm of axis).
............ ............ ............ ............ ............ ............ ..........42 Inflorescence terminal, a raceme, panicle, corymb, or compound cyme or thyrse.
............ ............ ............ ............ ............ ............ ............ ..44 Inflorescence a flat-topped corymb or rounded compound cyme, as wide as or wider than long
............ ............ ............ ............ ............ ............ ............ ..44 Inflorescence elongated, a raceme, panicle, or thyrse, much longer than wide.
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