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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 to Asteraceae, Key A: woody composites (shrubs and lianas)

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1 Leaves strictly alternate; [tribe Astereae].
..2 Heads discoid; dioecious shrubs to 5 m tall; [widespread in our area]
..2 Heads radiate (most or all on a plant); bisexual shrub to 1 m tall or scrambling liana; [of se. NC southward, native in the Coastal Plain only].
....3 Leaves with clasping base, with a midvein and lateral veins and tertiary reticulation; rays pink or rose; sprawling viny shrub to 4 m tall; [of wet habitats of SC (or se. NC) southward, also cultivated]
....3 Leaves with a cuneate base, with a midvein and otherwise minutely pebbled; rays yellow; intricately branched shrub to 1 m tall, with persistent sterile shoots with evergreen leaves and annual flowering shoots (the entire shoot and leaves deciduous); [of xeric sandy barrens, of se. NC southward]
1 Leaves opposite, at least on the lower stem nodes (the leaves higher on the stem sometimes alternate); [tribe Heliantheae].
......4 Heads radiate, ray florets yellow; disc florets yellow; leaves strictly opposite or in part alternate.
........5 Leaves obovate to oblanceolate, unlobed; leaves strictly opposite; [of tidally inundated salt and brackish marshes of the outer Coastal Plain ]; [tribe Heliantheae; subtribe Ecliptinae]
........5 Leaves rhombic or pentagonal, unlobed or more often 3-5-lobed; leaves in part alternate; [of disturbed, suburban areas of FL peninsula]; [tribe Heliantheae; subtribe Helianthinae]
......4 Heads discoid or disciform, ray florets lacking; disc florets pink, purple, or whitish; leaves opposite, but usually at least in part alternate higher on the stem; [collectively of various habitats, Coastal Plain and inland].
..........6 Heads solitary, axillary in the axils of leaves or leafy bracts; heads nodding, the involucre 2-7 mm high; [collectively widespread in our area, of maritime and inland wetlands or moist disturbed areas]; [tribe Heliantheae; subtribe Ambrosiinae]
 Iva
..........6 Heads many, terminal on the branches of corymbiform arrays; heads erect, the involucre 4-12 mm high; [of Coastal Plain of FL, s. GA, s. AL, and c. MS, of dry, sandy scrub and pinelands, blackland prairies, or dry, disturbed areas].
............ 7 Leaves with punctate glands; pappus of 60-70 barbellate bristles, 8-12 mm long; [tribe Heliantheae; subtribe Eupatoriae]
............ 7 Leaves lacking punctuate glands; pappus of 4-10 scales, 0.3-7 mm long; [tribe Heliantheae; subtribe Chaenactidinae]
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