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Centaurium
See list of 2 species in this genusSee Mansion (2004) for the dismantling of this group (the segregate genus Schenkia also known from New England).
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1a. Flowers on pedicels mostly (1.5–) 2–5 mm long; calyx nearly equaling the length of the basal, connate portion of the corolla; corolla lobes 2–4 mm long; plants lacking a basal rosette of leaves
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1b. Flowers sessile or subsessile; calyx usually ca. ½ as long as the basal, connate portion of the corolla; corolla lobes usually 5–6 mm long; plants with a basal rosette of leaves
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Each photo represents one species in this genus.