Overview

Appearance: Dianthus armeria is a herbaceous annual or biennial plant growing to 1-2.5 ft. (0.3-0.8 m) tall.
Foliage: They have patches of fine white hairs beneath each opposite pair of leaves, otherwise they are mostly glabrous. The opposite leaves are up to 3 in. (1.6 cm) long and 0.13 in. (0.32 cm) across. They are linear, sessile, and usually slightly pubescent. The base of each pair of leaves wraps around the stem in a sheath, where the stem is somewhat broader and knobby.
Flowers: Each flower is about 0.33 in. (0.85 cm) across, consisting of 5 spreading petals, a tubular green calyx with 5 teeth, 10 stamens with pink anthers, and 2 styles. The petals are pink with small white dots. Each petal is wedge-shaped at its base, and crenate or dentate toward its outer edge.
Fruit: Each seed is orbicular or rein form and flattened with small bumps across its surface. The root system consists of a slender taproot. This plant spreads by reseeding itself.
Ecological Threat: This plant will over take roadsides, ditches and fields.

Resources

University of Massachusetts Amherst Extension [1]
North Carolina State University [2]
USDA NRCS PLANTS [3]
USDA ARS GRIN [4]
Wildscreen Arkive[5]