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Key G5: shrubs and subshrubs with alternate, simple, unlobed, toothed leaves

Plantae

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1 Subshrubs or dwarf shrubs, aboveground stems creeping or erect, < 15 cm tall; leaves evergreen.
  2 Leaves 1.5-3 cm wide, coarsely toothed; flowers lacking sepals and petals; [exotic species, sparingly naturalized or spreading in suburban situations]
  2 Leaves < 1.5 cm wide, finely toothed or entire; flowers with sepals and petals; [native species, collectively widespread and common].
    3 Leaves fleshy, terete in ×-section; petals 5, bright pink
    3 Leaves flat, not fleshy; petals white or pale pink.
      4 Leaves < 2.5 mm wide; corolla with petals distinct; plant creeping
      4 Leaves > 5 mm wide; corolla with petals fused (distinct in Chimaphila); plant creeping or erect
1 Shrubs, aboveground stems erect, > 30 cm tall; leaves evergreen or deciduous.
        5 Inflorescence an involucrate (composite) head subtended by phyllaries, the heads solitary or many and variously arrayed in secondary inflorescences, the ovary inferior, the corolla connate and tubular at least basally, the calyx absent, the stamens 5, the fruit a cypsela
        5 Inflorescence, flower, and fruit structure various, but not with the combination of features as above.
          6 Leaves evergreen.
             7 Leaves glandular-punctate on one or both surfaces with golden-yellow glands; flowers unisexual, lacking a perianth (arranged in axillary catkins); fruit a pale gray, waxy drupe with a single seed
             7 Leaves not glandular punctate; flowers bisexual or unisexual, with a white, pink, or yellow perianth; fruit various: a red, blue, or black drupe, a berry with several seeds, or a capsule.
               8 Petals connate, flowers urceolate (ERICACEAE) or rotate, white to pale pink; flowers bisexual; fruit a drupe (Ehretia in EHRETIACEAE), OR a capsule or berry (ERICACEAE)
                 9 Flowers rotate, fragrant, the petals white, arranged primarily in terminal cymes; fruit an orange or yellow drupe, each bearing 2 hemispheric nutlets (these each also composed of 2 seeds, thus the fruit bearing 4 seeds)
                 9 Flowers urceolate, fragrant or not, the petals white to pale pink, variously arranged in terminal or axillary inflorescences (occasionally solitary in axils); fruit either a capsule or a red, blue, or black berry
               8 Petals distinct, yellow or white; flowers unisexual or bisexual; fruit either a black or red drupe with several pyrenes, a red berry with several seeds, or red or black pomes.
                   10 Plants with nodal, simple or tripartite thorns; flowers bisexual, with a yellow perianth; fruit a red berry with several seeds
                   10 Plants lacking thorns; flowers unisexual or bisexual, with a white perianth (yellow or red in Ochna); fruit either a black or red drupe with several pyrenes or a red or black pome.
                     11 Petals yellow, clawed; sepals red and forming a persistent red receptacle (torus) bearing numerous blackened drupes.
                     11 Petals white, not clawed; sepals not bright red nor persistent, the fruit a drupe or pome.
                       12 Flowers unisexual; fruit a black or red drupe with several pyrenes
                          13 Plants lacking thorns; leaf teeth acute, blunt, rounded, or callus-tipped, but not spinulose.
                              15 Leaves crenate or serrate, but usually not wavy, pubescence of leaves and stems simple
                            14 Leaves crenulate, serrate or serrulate, with >2 teeth per cm of leaf margin; leaves cuneate, rounded, or subcordate at base, not oblique; pubescence of leaves and stems absent or simple.
                                  17 Ovary 5-locular; stamens many or 5, fused or separate; fruit a 5-valved capsule or of 5 mericarps; flowers yellow or pink, or white with a pink blaze
                                  17 Ovary 3-locular; stamens 5, separate; fruit a 3-valved capsule or drupe; flowers white or pale green
                                    18 Flowers in catkins; perianth absent or very small; fruit a 1-seeded nut, samara, or waxy drupe (capsule in Salix in SALICACEAE).
                                       19 Leaves < 3 cm wide, either punctate-glandular on one or both surfaces or lacking punctate glands; fruit a 1-seeded waxy drupe or a capsule.
                                    18 Flowers arrayed variously, but not in catkins; perianth present, conspicuous; fruit a 1-many-seeded capsule, pome, berry, or follicle.
                                                      26 Petals separate (or absent in Rhamnus alnifolia); stamens opposite to the petals (when present) and alternate to the sepals; fruit 2-4-locular, with 2-4 pyrenes
                                                              30 Stamens 5; ovary and capsule 2-locular; leaves elliptic (widest near the middle), the teeth fine (usually > 5 points per cm of margin), and along much of the margin; inflorescence a terminal raceme; hairs of the lower leaf surface simple, erect
                                                              30 Stamens 10; ovary and capsule 3-locular; leaves obovate (widest towards the apex), the teeth obscure to coarse (usually < 4 points per cm of margin), and primarily in the upper half of the leaf; inflorescence a terminal or axillary raceme or cyme; hairs of the lower leaf surface either simple and appressed, or stellate.
                                                                 31 Leaf margins regularly and evenly serrate in the upper half of the leaf (usually nearly entire towards the base); inflorescence an elongate, many flowered (>30) raceme borne at the end of branchlets of the season; corolla of separate petals, the stamens separate; hairs of the lower leaf surface simple and appressed
                                                                 31 Leaf margins wavy or irregularly dentate, mainly in the upper half of the leaf; inflorescence a few flowered (<20) axillary raceme, cyme, or cluster; corolla fused basally into a tube, the stamens adnate to the tube; hairs of the lower leaf surface stellate