Wahlenbergia paludicola Thulin

Annual slender ± trailing or straggling herb, 10–50 cm. tall, glabrous.. Stem usually branching only in upper part, furrowed.. Leaves sessile; basal ones ± ovate, caducous; stem leaves linear to narrowly lanceolate, 2–12 mm. long, 0.2–1(–1.6) mm. wide, acute; margin cartilaginous with a few denticles; midvein prominent beneath, lateral veins obscure.. Inflorescence lax; pedicels 6–32 mm. long.. Hypanthium 5(–10)-nerved, glabrous.. Calyx-lobes 0.6–1.4 mm. long.. Corolla 2.4–3.5 mm. long, white or bluish, split almost to the base into lanceolate lobes.. Filament-bases narrowly dilated, ± ciliate; anthers 0.35–0.8 mm. long.. Ovary 2-locular, semi-inferior; style about as long as or somewhat shorter than the corolla, eglandular, glabrous or ± hairy below, slightly thickened in the upper part, subcapitate and with 2 very short lobes at the apex.. Capsule 2-locular, 5(–10)-nerved; valves 2, 0.6–1.4 mm. long.. Seeds elliptic in outline with acute ends, trigonous, 0.45–0.6 mm. long; testa almost smooth.