Stems erect, freely branched, narrowly 4-winged, 4-6 dm. tall, very sparsely glandular-setose; petioles 1-2 cm. long, winged distally; leaf-blades thin, bright green, ovate-oblong to broadly ovate, 3-7 cm. long, 2-4 cm. wide, acute, minutely ciliate-serrulate, rounded at base, 5-nerved, sparsely setose above, glabrous beneath; inflorescence many-flowered, divided into elongate spiciform branches; flowers sessile or nearly so; hypanthium narrowly campanulate, 4 mm. long, the erect calyx-tube obscurely lobed into depressed-triangular, minutely apiculate sepals 1 mm. long or shorter; petals pink, about 3 mm. long; stamens almost isomorphic; filaments 2 mm. long; anthers ovate, 0.8 mm. long; connective very briefly prolonged, bearing a single short, subulate, anterior spur; fruiting hypanthium long persistent, 10 mm. long, the flat sides of the seeds confluent over the end.
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