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A slender, erect, annual herb with simple or ascendingly branched stem above the base, narrowed to an acute apex. Leaves are linear-lanceolate to linear-oblong and auriculate-clasping at the base. Inflorescence is simple to compound with rather open cymes and 3–12 obovate to rounded pink flowers per axil. Fruit is a capsule, equaling or exceeding the calyx.