Erect, slender, glabrous, annual herb (6)-10-20- (25) mm tall, usually with a simple stem and a solitary terminal flower, very rarely branched and with 2-5 flowers. Leaves usually all cauline, sometimes congested at base, in 3-6-(9) opposite pairs, apetiolate, (1.5)-3.5-8-(13) × (0.5)-1-2 mm, spathulate, obtuse, slightly narrowed to base, green or tinged purplish, fleshy, dull, with distinct mid-vein. Uppermost leaves sometimes reduced to bracts. Pedicel (1)—3—8 mm long. Flowers 4-(5)-merous. Calyx (1.5)—3- 5-(6) mm long, cut to 2/5-½ way; lobes triangular to ovate-triangular, acute, erect at fruiting; sinuses acute. Petals (2.5)-4-6-(7) mm long, exceeding calyx by 1-1.5 mm, white, cut to c. ½ way; lobes ovatetriangular. Capsule ovate-elliptic, brown, dehiscent from apex. Seeds 0.5-1 mm diameter, globular to ovoid, slightly rough.

Herba minuta annua, plerumque caule simplici floreque solitario terminali rarissime 2-5 floribus induta. Folia plerumque omnia caulina, in 3-6-(9) paribis oppositis disposita, spathulata. Flores4-(5)-meii. Calyx per 2/5- ½ longitudinis sui dissec tus. Petala alba, ad c. ½ dissecta. A G.filipede differt statura plerumque breviore, floribus paucioribus plerumque 4-meris, calyce corollaque minus dissecta.