1 Plant with an upright or arching stem with alternate cauline leaves.

..2 Shrub; "leaves" (actually cladophylls) coriaceous, evergreen, glossy; [exotic, rarely naturalized]; [tribe Rusceae]

..2 Herb; leaves herbaceous, deciduous, dull or slightly glossy; [native]; [tribe Polygonatae].

....3 Inflorescence of 1-several axillary flowers; tepals fused; leaves with > 7 main parallel veins, obtuse to acute at the apex; foliage blue-green, glaucous

1 Plant tufted, the leaves essentially basal (although the sheathing bases form a 'false' stem in Convallaria).

......4 Leaves 2-3, narrowly elliptic, often variegated with light and dark green; tepals fused, white, greenish, or purplish.

........5 Leaves deciduous, narrowly elliptic, the blades < 30 cm long; flowers in a raceme; the tepals not fleshy; [tribe Convallarieae]

........5 Leaves evergreen, linear-lanceolate, the blades > 40 cm long; flower either solitary, axillary, the tepals fleshy, or flowers in a raceme, the tepals not fleshy.

..........6 Leaves broadly lanceolate, ca. 6× as long as broad; flower solitary, axillary, the tepals fleshy; [tribe Convallarieae]

..........6 Leaves narrowly lanceolate or oblanceolate, ca. 12× as long as broad; flowers in a raceme, the tepals not fleshy; [tribe Dracaeneae]

......4 Leaves many, linear, not variegated with light and dark green; tepals separate (or fused basally), white or violet.

............ 7 Fruit dehiscent, dry and capsular; inflorescence a panicle or raceme, to 15 dm tall; [natives, of longleaf pine woodlands of SC, GA, and FL]; [tribe Nolineae]

............ 7 Fruit indehiscent, quickly exposing berry-like seeds with a fleshy seed coat; inflorescence spikelike, to 4 dm tall; [aliens, naturalized from horticultural plantings]; [tribe Ophiopogoneae].

............ ..8 Flowers erect, the pedicel strict; ovary superior

............ ..8 Flowers nodding, the pedicel recurved; ovary inferior or half-inferior

1 Leaves compound.

..2 Plants herbaceous; leaves palmately 3-foliolate or pedately compound

..2 Plants woody; leaves either palmately divided or pinnately compound into > 20 segments

1 Leaves simple.

....3 Leaves opposite or whorled, cauline.

......4 Leaves opposite; flowers bilaterally symmetrical

......4 Leaves whorled; flowers radially or bilaterally symmetrical.

........5 Plant with 2 or more leaf-bearing nodes (all nodes whorled or some alternate).

..........6 Leaves broad, < 2× as long as wide, cordate at the base; flowers unisexual and plants dioecious

..........6 Leaves lanceolate, oblanceolate or narrowly elliptic, > 4× as long as wide, cuneate at the base; flowers bisexual and plants hermaphroditic

........5 Plant with a single leaf-bearing node.

............ 7 Leaves in whorls of 3 leaves

............ 7 Leaves in whorls of 5 or more leaves.

............ ..8 Stem floccose, wiry (and at maturity with a second smaller whorl with usually 3 leaves subtending the flowers); flowers radially symmetrical

............ ..8 Stem glabrous, fleshy, never with a second whorl; flowers bilaterally symmetrical

....3 Leaves alternate, either cauline or basal.

............ ....9 Inflorescence a spadix (a dense spike of hundreds of flowers, the rachis thickened and somewhat fleshy) subtended by a spathe (a green, white, orange, yellowish-green, or maroon bract) (spathe missing in Orontium)

............ ....9 Inflorescence otherwise, a raceme, panicle, cyme, umbel, spike, etc., the flowers arrayed in a more diffuse manner, the central rachis not thickened, the inflorescence subtended or not by green or scarious spathes.

............ ......10 Flowers bilaterally symmetrical or asymmetrical; fertile stamens 1 or 2 (or 5 in MUSACEAE), often with several staminodes present as well; tepals 6.

............ ........11 Leaf venation parallel; leaves various in size and shape, if > 3 dm long, then < 1 dm wide; perianth often differentiated into a lip and 5 petaloid tepals

............ ........11 Leaf venation prominently penni-parallel; leaves large, at least some on a plant with blade > 2 dm long.

............ ..........12 Fertile stamens 5-6; leaf blades 6-30 dm long

............ ..........12 Fertile stamen 1; leaf blades 0.5-7 dm long.

............ ............ 13 Leaves spirally arranged.

............ ............ ..14 Leaves lacking ligules; ovary and fruit with warty excrescences

............ ............ ..14 Leaves with 2 stipule-like ligules; ovary and fruit smooth

............ ............ 13 Leaves 2-ranked.

............ ............ ....15 Leaves jointed and swollen at the summit of the petiole

............ ............ ....15 Leaves neither jointed not swollen at the summit of the petiole

............ ......10 Flowers radially symmetrical (weakly to strongly bilaterally symmetrical in PONTEDERIACEAE); stamens 6 (rarely 3, 4, 5, 9, 12, 15, or 18); tepals usually 6 (rarely 3 or 4), when 6, either undifferentiated (6 or 4 tepals) or differentiated into 3 petals and 3 sepals.

............ ............ ......16 Inflorescence subtended by spathes (well-developed green or scarious bracts).

............ ............ ........17 Perianth not differentiated, consisting of 6 similarly colored and shaped tepals; flowers strongly to slightly bilaterally symmetrical; inflorescence lacking well-developed spathaceous bracts

............ ............ ........17 Perianth differentiated into green sepals and more brightly colored petals; flowers radially symmetrical (or weakly bilaterally symmetrical, as in some Commelina).

............ ............ ..........18 Ovary superior; fruit a capsule; stamens 6; [plants mainly of uplands (Murdannia and sometimes Commelina of wetlands)]

............ ............ ..........18 Ovary inferior; fruit a berry; stamens 3, 6, 9, 12, 15, or 18; [plants of wetlands]

............ ............ ......16 Inflorescence not subtended by spathes, though individual small green bracts sometimes subtending individual flowers.

............ ............ ............ 19 Gynoecium of 2 or more pistils (6 in Butomus); fruit achenes or follicles; inflorescence a raceme or panicle with branching in whorls of 3 OR a bracteate umbel; [wetland plants].

............ ............ ............ ..20 Flowers consisting of white petals and green sepals, with 1-many stamens and 3-many carpels (but not consistently with 9 stamens and 6 carpels); inflorescence a raceme or panicle in whorls of 3, branched; leaf blades flat or terete

............ ............ ............ ..20 Flowers consisting of pink petals and green-pink sepals, usually with 9 stamens and 6 carpels; inflorescence an umbel; leaf blades triquetrous in cross-section

............ ............ ............ 19 Gynoecium of 1 pistil; fruit simple, a capsule or berry; inflorescence various, terminal or axillary, but if a raceme or panicle, not with branching in whorls of 3; [upland (or very rarely wetland) plants].

............ ............ ............ ....21 Leaves basal or basally disposed.

............ ............ ............ ......22 Leaves 2 (rarely 3 in Convallaria in RUSCACEAE).

............ ............ ............ ........23 Inflorescence a raceme; fruit a berry; tepals united, the perianth urceolate

............ ............ ............ ........23 Inflorescence an umbel or a solitary flower; fruit a capsule; tepals separate or basally fused.

............ ............ ............ ..........24 Flowers in an umbel, white; fresh plants with oniony odor

............ ............ ............ ..........24 Flowers solitary, white or yellow; fresh plants without strong odor

............ ............ ............ ......22 Leaves 4 or more.

............ ............ ............ ............ 25 Inflorescence a terminal umbel; fruit a blue or black berry; tepals white or yellow; flowers bisexual

............ ............ ............ ............ 25 Inflorescence a terminal raceme or panicle; fruit a capsule; tepals white, green, yellowish, or pink; flowers either bisexual (Helonias in HELONIADACEAE), or unisexual and primarily on different plants (dioecious) (Chamaelirium in CHIONOGRAPHIDACEAE), or a mix of bisexual and unisexual staminate flowers (Veratrum in MELANTHIACEAE)

............ ............ ............ ............ ..26 Inflorescences bracteate, with bracts subtending individual pedicels and (if they are present) branches of the inflorescence; tepals white, greenish-white, or cream

............ ............ ............ ............ ..26 Inflorescence ebracteate, lacking bracts subtending pedicels; flowers bisexual (Helonias) or predominantly unisexual and on different plants (dioecious) (Chamaelirium); tepals pink (Helonias) or white to cream (Chamaelirium).

............ ............ ............ ............ ....27 Flowers white to cream; plants dioecious (individual plants either male or female, with all male flowers or all female flowers)

............ ............ ............ ............ ....27 Flowers pink; plants hermaphroditic (individual flowers bisexual)

............ ............ ............ ....21 Leaves cauline.

............ ............ ............ ............ ......28 Leaves both cordate/subcordate (rarely merely rounded at the base) and obviously petiolate.

............ ............ ............ ............ ........29 Inflorescence an axillary many-flowered umbel; fruit a berry; axillary tendrils often present (absent in some species)

............ ............ ............ ............ ........29 Inflorescence an axillary solitary flower, a few-flowered cyme, or a panicle; fruit a capsule (winged in Dioscorea, unwinged in Croomia); axillary tendrils never present (plant not climbing, or climbing by twining).

............ ............ ............ ............ ..........30 Tepals 6; stamens 6; flowers unisexual (and generally on separate plants, therefore dioecious); inflorescence of a solitary flowers or a panicle; ovary inferior; [widespread in our area]

............ ............ ............ ............ ..........30 Tepals 4 (-5); stamens 4 (-5); flowers bisexual; ovary superior; [AL and adjacent GA, FL, and perhaps LA]

............ ............ ............ ............ ......28 Leaves not both cordate/subcordate and petiolate (some with cordate clasping or perfoliate leaf bases). {add [Smilax] SMILACACEAE below}

............ ............ ............ ............ ............ 31 Leaves alternate and in whorls at some nodes; flowers orange; tepals > 5 cm long; inflorescence a terminal umbel or single flower

............ ............ ............ ............ ............ 31 Leaves strictly alternate; flowers yellow, white, pink, greenish, or maroon; tepals < 5 cm long; inflorescence either a terminal cluster, raceme, panicle or umbel, or an axillary raceme, cluster or solitary flower.

............ ............ ............ ............ ............ ..32 Inflorescence a terminal umbel; flowers slightly zygomorphic, reddish, the tepals 3.5-4.5 cm long

............ ............ ............ ............ ............ ..32 Inflorescence either a terminal cluster, raceme, or panicle, or an axillary raceme, cluster or solitary flower; flowers actinomorphic, variously colored (most white or yellow), the tepals < 3.5 cm long (except Uvularia grandiflora).

............ ............ ............ ............ ............ ....33 Leaves arrayed spirally around an erect, unbranched stem; fruit a septicidal capsule; flowers a mixture of bisexual and unisexual (staminate) on a plant; perianth white, greenish white, or maroon.

............ ............ ............ ............ ............ ......34 Leaves basally disposed; leaves not at all to slightly plicate, 1-14 cm wide; tepals glabrous, 4-9 mm long, 1-3 mm wide (3-5 mm wide in M. hybridum), with either conspicuous (M. hybridum) or diffuse (M. parviflorum and M. woodii) glands; filaments fused to the basal claw of the tepal

............ ............ ............ ............ ............ ......34 Leaves cauline; leaves strongly plicate, 6-15 cm wide; tepals pubescent, 8-13 mm long, 3-5 mm wide, with a conspicuous pair of glands near the base of the tepal blade (these sometimes more or less fused); filaments free from the tepals

............ ............ ............ ............ ............ ....33 Leaves arrayed distichously (2 ranked) along an arching, unbranched or dichotomously (Y-forking) branched stem; fruit a berry or loculicidal capsule; flowers all bisexual; perianth white, pink, or yellow.

............ ............ ............ ............ ............ ........35 Stems of fertile and sterile individuals simple (never branched); inflorescence a terminal raceme or panicle (Maianthemum) or axillary racemes or clusters of 1-9 flowers (Polygonatum); fruit a berry.

............ ............ ............ ............ ............ ..........36 Inflorescence of 1-several axillary flowers; tepals fused; leaves with > 7 main parallel veins, obtuse to acute at the apex; foliage blue-green, glaucous

............ ............ ............ ............ ............ ........35 Stems of fertile individuals branched (always at least bifurcate), but sterile individuals in some genera characteristically unbranched; inflorescence either of 1 (-2) flower(s) borne in a leaf axil (Uvularia, Streptopus), or of (1) 2 (-3) flowers borne terminally opposite the last leaf (Prosartes); fruit a berry or capsule.

............ ............ ............ ............ ............ ............ 37 Leaves perfoliate; fruit a capsule

............ ............ ............ ............ ............ ............ 37 Leaves sessile (though sometimes slightly to strongly clasping); fruit a berry or capsule.

............ ............ ............ ............ ............ ............ ..38 Stem brown, wiry, puberulent; last 2 leaves (near stem tip) on each branch approximate to one another (sometimes subopposite) and with noticeably oblique bases; flowers and fruits terminal on the branches

............ ............ ............ ............ ............ ............ ..38 Stem green, not wiry, glabrous; last 2 leaves (near stem tip) on each branch no closer together than other leaves, with symmetrical bases; flowers (and fruits) either terminal on the branches or solitary and axillary to most leaves.

............ ............ ............ ............ ............ ............ ....39 Flowers and fruits in single terminal clusters (sometimes appearing axillary, but still only one cluster per branch of the stem); tepals pale to rich yellow

............ ............ ............ ............ ............ ............ ....39 Flowers and fruits 1 (-2) in the axils of many leaves; tepals white to pink