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Keyed in multiple places:

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Key F2: Woody angiosperms with alternate, compound 4+-foliolate leaves

Plantae

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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.
             7 Stems often with paired nodal spines; leaves evergreen, glossy; inflorescence an umbel; fruit a drupe, dark purple to back at maturity
             7 Stems unarmed; leaves deciduous, dull or moderately glossy; Inflorescence a panicle (or if a corymb-like cyme, then the leaflets also deeply lobed, as in Ampelopsis aconitifolia); fruit a berry, variously colored
               8 Inflorescence a corymb-like cyme; styles elongate and cylindric; leaflets deeply lobed; tendrils 2-branched, never with terminal adhesive discs; pith between nodes of older stems becoming chambered; berries sometimes with dark spots
               8 Inflorescence a panicle; styles short, conic-shaped; leaflets not deeply lobed; tendrils 3-12-branched, with adhesive discs (these reduced or lanceolate in shape in P. inserta); pith between nodes of older stems not becoming chambered (continuous); berries never spotted
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Key to Rosaceae, Key D: Shrubs and trees with compound leaves

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(c) Cressler, Alan M.
1 Leaflets < 5 mm wide, entire; densely-branched shrub to 1 m tall; flowers yellow; [tribe Potentilleae]
1 Leaflets > 10 mm wide, serrate or crenate; shrubs, trees, or woody vines (see below); flowers white, pink, or purplish (rarely yellow in Rosa).
  2 Leaves 1-pinnately compound, generally with > 11 leaflets; inflorescence a terminal panicle or corymb with numerous (> 100) flowers, the petals white and < 4 mm long; fruit a pome or follicle; upright tree or shrub with unarmed stems.
(c) Marcum, Paul
    3 Inflorescence a panicle; fruit a follicle; shrub, to 2 m tall; [tribe Sorbarieae]
(c) Danielson, Erik
(c) Bradley, Keith
    3 Inflorescence a corymb; fruit a pome; tree, generally > 2 m tall; [tribe Pyreae]
  2 Leaves palmately or 1-pinnately compound, generally with < 11 leaflets; inflorescences axillary or terminal panicles or corymbs with few (<15) flowers, the petals white, pink, or purplish (rarely yellow) and > 6 mm long; fruit a hip or aggregate of drupelets; arching or upright shrubs or climbing or sprawling woody vines, the stems usually armed with prickles.
(c) Imbeau, Louis - CC-BY
(c) Radford, Ahles and Bell
(c) Hacker, Patrick - CC-BY
      4 Fruit a hip, developing from a globose to urceolate hypanthium, enclosing the ovaries and achenes, except for the apical orifice; leaflets usually acute to obtuse at the apex; leaflet margins crenulate or serrulate; [tribe Roseae]
(c) Jaxon - CC-BY-NC, permission granted to NCBG
(c) Fleming, Gary P.
(c) Bradley, Keith
      4 Fruit an aggregate of drupelets, developing from a flattish or hemispheric hypanthium, with the ovaries and drupelets exposed; leaflets usually acuminate at the apex; leaflet margins serrate or doubly serrate; [tribe Rubeae]