Gen. N. Amer. Pl. 2: 43. 1818.
Perennials. Stems repent or prostrate, matted, rooting at proximal or most nodes, 2–30 (–43) cm. Leaves cauline, thick; petiole absent; blade orbiculate, widely elliptic, or widely ovate, 2–16 × 1.5–16 mm, palmately 3–7-veined, leathery, margins entire, remotely toothed, or undulate; distal well developed or slightly reduced. Pedicels 6–38 mm, 2–5 times subtending leaves. Flowers: sepals 2–5.8 mm, connate to 1/8 lengths; corolla-tube and adaxial lip lavender or blue to white, abaxial lobes white with violet to blue spots or streaks, tube 5–9 mm, adaxial lip 1/4 abaxial; stamens 2; staminodes each with appendage and distal segment. Capsules ellipsoid, sometimes obliquely or narrowly ovoid, 2.3–6.9 × 1.2–2.5 mm. Seeds 6-angled, strongly ribbed.
Phenology: Flowering year-round.
Habitat: Swamps, low woods and grasslands, wet depressions, ditches and along edges of streams and ponds, usually in sandy soil.
Elevation: 0–50 m.
Lindernia grandiflora has been introduced into the horticultural trade in the southern United States as a container plant or groundcover for wet areas or in bogs or water gardens. It is sometimes sold under the name "Ilysanthes floribunda," which has no standing in botanical nomenclature, or as blue moneywort or angel's tears.
"thick" is not a number.