Coelanthum semiquinquefidum Druce

Annual with 1-3 usually erect flowering stems. Lowest basal leaves oblong, the others linear-oblong, 1.5-3.5 cm long, 0.2-0.4 cm wide, narrowed to the base but not petiolate, at the tip acute, minutely hair-pointed; stipules 3-5 mm long, cut into narrow lobes or hairs. Stem leaves linear, 1-1.5 cm long, stipules 1-2 mm long. Flowering stems with 2-4 whorls of leaves. Inflorescences terminal and at the nodes, the branches pseudoracemose. Pedicels 2-4 mm long. Perianth 2-4 mm long, narrowed at the mouth, more or less urceolate, the free lobes shorter than the tube, obtuse, with a narrow white border. Stigmas about 1 mm long. Fruit about as long as the perianth. Seeds granulate, biconvex, with a slight rim.