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Keyed in multiple places:

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Key to Eleutherococcus

Araliaceae

Eleutherococcus

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1 Leaves (3-) 5 (-7)-foliolate; stems with slender, nearly straight prickles; inflorescence a solitary umbel
1 Leaves 3 (-5)-foliolate; stems with stout, recurved prickles; inflorescence a panicle of umbels or a compound umbel
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Key F2: Leaves with 4-many leaflets (poorly developed leaves in some species with only 3 leaflets, but usually leaves elsewhere on the plant with 4 or 5+).

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(c) Summerbell, Emily - CC-BY
1 Leaves palmately-pedately 5-foliolate (the lateral 2 leaflets on each side borne on a common Y-shaped stalk).
1 Leaves palmately compound (all the leaflets attached at a single point).
    3 Leaves > 6 dm wide
    3 Leaves < 3 dm wide.
      4 Leaflets with entire margins; [non-natives].
        5 Plants deciduous woody climbers (but not twining, or specialized climbing structures); leaflets usually 5 per leaf (occasionally 3 or 7); flowers maroon-colored, lacking petals but with 3 prominent sepals, the inflorescences axillary
        5 Plants evergreen shrubs or trees (occasionally partially epiphytic); leaflets usually 7-9 per leaf (occasionally 5 or 10); flowers yellowish-green or red, petals present, lacking showy prominent sepals, the inflorescences (most often) terminal
      4 Leaflets with serrate margins; [natives and non-natives].
          6 Stems armed with prickles scattered in the internodes
          6 Stems unarmed or with paired nodal spines.