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Gratiola
See list of 3 species in this genus-
1a. Leaf blades lanceolate to ovate, with a broad base [Fig. 768], glandular-punctate, (8–) 10–25 (–30) mm long; corolla 12–16 mm long, yellow throughout (rarely white); capsule 2–3 mm long; plants perennial
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1b. Leaf blades lanceolate to oblong or oblanceolate, with a narrow base, not glandular-punctate, (10–) 20–50 (–70) mm long; corolla 8–12 mm long, largely white (commonly with yellow lobes in 1 species); capsules 3–9 mm long; plants annual
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2a. Pedicels relatively stout, (0.1–) 1–4 (–14) mm long in fruit, ascending to erect; corolla of chasmogamous flowers pubescent within with filiform hairs; capsules 5–9 mm long; seeds slender-cylindric, 0.7–0.8 mm long
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2b. Pedicels relatively slender, 10–20 (–25) mm long in fruit, spreading; corolla of chasmogamous flowers pubescent within with clavate-tipped hairs; capsules 3–5 mm long; seeds thick-cylindric, 0.4–0.5 mm long
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Each photo represents one species in this genus.