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Flowers (3)4-merous, congested into usually quite large axillary heads 0.5–2 cm. wide, usually made up of normal axillary clusters together with those at the nodes of much reduced axillary shoots, the whole coalescing, each compound inflorescence thus supported by numerous leaves and also with leaves emerging from its centre; bracteoles very numerous, reddish-brown, 3 mm. long; pedicels 0.5 mm. long.
Leaf blades 2.5–6 cm. x 3–8 mm., linear-lanceolate, acute at the apex, mostly broadened at the base, pubescent or ± scabrid above with white hairs and with longer white hairs beneath, particularly or sometimes only on the broadened base; stipule bases 1–2 mm. long, hairy, with 7 setae 0.2–1.5 cm. long.
An erect annual herb. It grows 10-60 cm high. The stems are 4 angled. The leaf blades are 3-6 cm long by 3-8 mm wide. They are narrowly sword shaped. The fruit is a capsule 2.5 mm long. The seeds are brown and shiny. They are 2 mm long by 1 mm wide.
Corolla white or pale mauve; tube narrowly cylindrical with upper quarter funnel-shaped and c. 4 rimes as wide as basal part of tube, altogether 1.3 mm. long; lobes 0.8 x 0.4 mm., ovate-elliptic.
A rather coarse erect mostly sparsely branched annual herb 10–60 cm. tall, the stems often reddish or pinkish, 4-angled, hairy below the nodes.
Seeds chestnut-brown, very shiny, 1.8–2.2 x 0.8–0.9 x 0.5 mm., narrowly oblong-ellipsoid, with a deep ventral groove but ± no sculpture.
Calyx tube 1.4 mm. long, ellipsoid; lobes 4, 1–2 mm. long, linear-lanceolate or slightly spathulate, scabrid on the margins.
Capsule 2.5 mm. long, oblong-ellipsoid, hairy at the apex.
Style exserted 0.7 mm.; stigma with long papillae.
Filaments exserted 0.6 mm.
