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Keyed in multiple places:

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Key to Gratiola

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1 Capsule flattened, wider than long, notched; leaves dimorphic, with narrow submersed leaves on the lower stems, and broad floating leaves just subtending the aerial inflorescences; [of vernal pools on granite outcrops in Piedmont SC, GA, and AL]
1 Capsule turgid, longer than wide; leaves monomorphic; [collectively of many habitats and widespread].
..2 Flowers and fruits sessile or subsessile, the pedicels < 1 mm long; perennial.
....3 Leaves linear-subulate; corolla 2-3× as long as the calyx
....3 Leaves ovate; corolla 1-1.5 × as long as the calyx
..2 Flowers and fruits on definite pedicels; annual or perennial.
......4 Leaves clasping or subclasping-rounded at the base; perennial; [section Gratiola].
........5 Calyx subtended by 0 (-1) bractlet; corolla lobes white; corolla tube greenish yellow, conspicuously veined
........5 Calyx subtended by 2 bractlets; corolla lobes white or yellow-orange; corolla tube greenish yellow and conspicuously veined, or orange and not conspicuously veined.
..........6 Corolla lobes and tube yellow-orange (very rarely white), not conspicuously veined; sepals and flower stalks sparsely or not at all glandular-puberulent
..........6 Corolla lobes white to lavender, corolla tube greenish yellow, usually conspicuously veined; sepals and flower stalks densely glandular-puberulent.
............ 7 Leaves oblong-ovate to ovate (or linear-lanceolate in submersed forms), finely dentate; corolla veined with purple lines; sepals lanceolate to oblong-lanceolate
............ 7 Leaves triangular to lanceolate, margins entire, or with a few teeth toward the tip; corolla veined with brown lines; sepals linear-lanceolate
............ ..8 Leaves 3.5× as long as wide; lower leaf surface with only sunken, translucent glands
............ ..8 Leaves < 3× as long as wide; lower leaf surface with large, yellow sessile glands and sunken, translucent glands
......4 Leaves cuneate at the base; annual; [section Nibora].
............ ....9 Corolla yellow; [LA and TX]
............ ....9 Corolla white (or with pink or purple flush); [collectively widespread].
............ ......10 Pedicels stout, erect, 1-5 (-12) mm long
............ ......10 Pedicels slender, spreading, 10-45 mm long.
............ ........11 Corolla 13-25 mm long; leaves oval or oblanceolate
............ ........11 Corolla 5-14 mm long; leaves elliptic, rhombic-lanceolate, or lanceolate
............ ..........12 Mid-stem leaves (6-) 7-13 (-18) mm long; proximal fruiting pedicels (5-) 7-17 (-22) mm long, (0.9-) 1-2 (-2.3) × as long as the subtending bracteal leaves; bracteoles shorter than to barely exceeding the sepals; [of granite outcrops in the GA Piedmont]
............ ..........12 Mid-stem leaves (11-) 20-41 (-66) mm long; proximal fruiting pedicels (8-) 13-25 (-37) mm long, (0.3-) 0.5-1 (-1.6) × as long as the subtending bracteal leaves; bracteoles slightly to conspicuously longer than the sepals; [collectively of more habitats and more widespread].
............ ............ 13 Leaves narrowly elliptic or rhombic to oblanceolate, not conspicuously falcate, (2.7-) 5-11 (-18) mm wide, (2.5-) 3.5-5 (-6)× as long as wide; leaf margins with (1-) 3-5 (-7) teeth per side; primary veins 3-5 (-7); mid-stem moderately to densely glandular pubescent (rarely glabrate); seeds (0.18-) 0.22-0.26 (-0.29) mm thick; [widespread]
............ ............ 13 Leaves linear, linear-lanceolate, to elliptic-lanceolate, often falcate, (1-) 2.5-4 (-4.5) mm wide, (5.5-) 6-9.5 (-11)× as long as wide; leaf margins with 0-2 (-3) teeth per side; primary veins 1 (-3); mid-stem glabrous; seeds (0.19-) 0.26-0.32 (-0.37) mm thick; [limestone cedar glades of n. AL and c. TN]

Key to Sophronanthe

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1 Leaves linear-subulate; corolla 2-3× as long as the calyx
1 Leaves ovate; corolla 1-1.5 × as long as the calyx
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