Arenaria serpyllifolia L. / Immediate children: Arenaria serpyllifolia ssp. serpyllifolia, it is an annual, up to 25 cm tall, glandular hairy, lush green herb. Stem filiform, usually dichotomously branched, branches sub erect to ascending, internodes up to 2 cm long. Leaves sessile, triangular-ovate to broadly lanceolate. 3-6 (-7) x 2-3 (-4) mm, 3-5-nerved, entire. acute-acuminate, sparsely glandular hairy to glabrescent. Cyme usually monochasial many-flowered. Flowers small, c. 5 mm across, whitish-green. Pedicel up to 8 mm long, filiform, glandular-hairy. Sepals 5, ovate-lanceolate to lanceolate 3-4 x 1.5 mm, 3-5-nerved, acute-acuminate, margins white membranous, glandular outside. Petals 5, white, ovate-oblong, 1.5-3 mm long, entire, glabrous. Stamens 10, filament filiform, white; anthers sub globose, inconspicuous. Ovary sub globose, 0.5 mm in diameter, glabrous; style 3, free, c. 1 mm long, white. Capsule, ovoid-oblong or ± sub globose, pale yellow with brittle wall, slightly shorter than persistent enveloping sepals, dehiscing by 6 apical teeth. Seeds rounded-reniform, c. 0.5-0.7 mm long, blackish-brown, with papillate tubercles.
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