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Key to Mikania

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1 Involucre 6.5-8 mm; achenes 3.5-4.5 mm long; stems, leaves, and involucres spreading pubescent; pseudostipule a low ridge with a tomentose fringe; stem 6-angled; [of se. SC southward]
1 Involucre 4-5.5 (-6) mm high; achenes 1.5-2.5 (-2.7) mm long; stems, leaves, and involucres puberulent or nearly smooth; pseudostipule membranous; stem round in ×-section to obscurely 6-angled; [widespread in our area].
..2 Leaves usually medium green; corollas pinkish to purplish, 3.5-4 mm long; phyllaries linear-lanceolate, 5-6 mm long, hairy with segmented hairs; inflorescence branches hairy; pseudostipule a low ridge with membranous, narrowly awl-shaped projections; [widespread in our area]
..2 Leaves usually pale green or yellow green; corollas white, 2.5-3 mm long; phyllaries lanceolate to narrowly ovate, 3-4 mm long, glabrous or nearly so; inflorescence branches glabrous or nearly so; pseudostipule a membranous flap with incised lobes; [of s. FL].
....3 Leaves deltate-ovate and short pointed, densely glandular, thick
....3 Leaves ovate to triangular ovate and pointed, not glandular, membranous
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