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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key R: herbaceous dicots with opposite, compound leaves on the stem

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1 Inflorescence an involucrate head subtended by phyllaries, heads solitary or many, variously arrayed in secondary inflorescences; fruit a cypsela
1 Inflorescence various, but not as above; fruit various, not as above.
..2 Leaves pinnately compound.
....3 Leaves even-pinnate
....3 Leaves odd-pinnate.
......4 Plants vines, climbing or sprawling, the leaves often with tendril like petioles and leaf rachises; corolla 4-parted, radially symmetrical
......4 Plants not vines, more or less erect to arching and lacking adaptations for climbing; corolla 5-parted, radially or bilaterally symmetrical
........5 Plants often with a mix of mostly opposite, deeply 3-lobed leaves or trifoliate leaves (leaves sometimes simple); flowers pink or purplish-white, axillary; plants annual
........5 Plants typically with all leaves with > 3 leaflets; flowers primarily white, borne in dense terminal corymbs/cymes; plants perennial
..2 Leaves palmately compound.
..........6 Cauline leaves essentially sessile, and also palmately cleft to the base, and further lacerately divided into linear or oblanceolate segments
..........6 Cauline leaves petiolate, with 3-5, sessile or petiolulate, ovate, elliptic, or obovate leaflets (these serrate and sometimes with additional lobes).
............ 7 Plants annual; flowers typically unisexual and not showy, green; plants highly resinous and glandular; inflorescences variously arranged
............ 7 Plants perennial; flowers radially symmetric, showy, variously colored; plants typically not strongly resinous or glandular; inflorescences terminal
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