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Key to Lysimachia
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40294
2 Flowers in a terminal raceme, pedicellate, the flowers closely spaced, touching, the inflorescence thus appearing cylindrical, and generally drooping at the tip (reminiscent of Saururus cernuus); leaves 4-16 cm long; [introduced, rarely naturalized in upland situations] | |
3 Corolla lobes 5-8 mm long; leaf blades 4-10 cm long × 0.6-2.2 cm wide, epunctate | |
1 Leaves opposite or whorled; flowers yellow, white, pink, red, or blue. | |
5 Leaves > 2 cm long (sometimes less in L. nummularia, and then orbicular, and about as wide as long); flowers yellow | |
7 Leaves nearly round; plant trailing, rooting at nodes | |
8 Flowers 16-24 mm across; sepals about ½× as long as the petals; stem glabrous | |
7 Leaves linear, lanceolate, elliptic, or ovate; plant erect (or trailing and rooting at the nodes in L. radicans, which has lanceolate leaves). | |
14 Flowers in peduncled axillary racemes in the axils of midstem leaves; petals linear to lanceolate, ca. 5 mm long and ca. 1 mm wide, much surpassed by the stamens | |
14 Flowers solitary, all or most of them subtended by leaves similar in shape to (though often somewhat smaller than) normal stem leaves; petals lanceolate to ovate, as long or longer than the stamens. | |
16 Petals plain yellow, not marked with black lines; sepals 2.5-4.5 mm (L. vulgaris) or 5.5-9 mm long (L. punctata]; stem hairy; [exotic]. | |