Sabatia

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  1a. Perianth (8–) 9- to 12-merous [Fig. 668]; plants perennial, with elongate rhizomes terminating in basal rosettes of leaves
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    S. dodecandra

    2a. Calyx lobes oblanceolate to spatulate (rarely linear), without a hyaline margin, 1–3 mm wide, with 3–5 distinct nerves; basal, connate portion of the calyx distinctly nerved or corrugated; plants primarily of saline and brackish marshes
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    S. kennedyana

    2b. Calyx lobes linear, with a thin, hyaline margin, 0.5–1.5 mm wide, with 1–3 obscure nerves; basal, connate portion of the calyx smooth or inconspicuously nerved; plants primarily of sandy and peaty pond shores of the coastal plain
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  1b. Perianth (4–) 5 (–7)-merous [Fig. 669]; plants annual, biennial, or perennial from a short, branched caudex
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    S. campestris

    3a. Basal, connate portion of the calyx prominently 5-nerved, each nerve rib-like and thinly membranous-winged; lateral veins of the calyx lobes developed more prominently than the midvein
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    3b. Basal, connate portion of the calyx inconspicuously and/or finely nerved, the nerves neither rib-like nor thinly winged; lateral veins of calyx lobes developed equally or less prominently than the midvein
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      S. angularis

      4a. Cyme dichasial (i.e., the axis appearing trichotomously branched because each node has two lateral branches in addition to the central axis); leaf blades of the middle and upper stem ovate to narrow-ovate, broad-rounded to cordate and often clasping at the base; stem strongly tetragonal, with conspicuous wing-angles 0.1–0.5 mm wide
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      4b. Cyme monochasial (i.e., the axis appearing dichotomously branched because each node has a single, lateral branch in addition to the central axis) [Fig. 669]; leaf blades of the middle and upper stem oblong or linear to oblanceolate, narrowed but not clasping at the base; stem terete or irregularly ridge-angled
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        S. campanulata

        5a. Principal leaf blades linear to oblong or narrow-oval, widest at or below the middle, broadly sessile at the base, not darkening in drying; corolla usually not or only slightly exceeding the calyx; plants perennial from a short, branched caudex, primarily of sandy and peaty pond shores of the coastal plain
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        S. stellaris

        5b. Principal leaf blades elliptic to oblanceolate, widest at or above the middle, narrowly tapering to the base [Fig. 669], often darkening in drying; corolla usually distinctly surpassing the calyx; plants annual, usually from fibrous roots, primarily of saline and brackish marshes

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