Plants 0.5–1.5 m. Stems often malodorous, sometimes also with simple hairs 2 mm. Leaf blades 4–8 cm (often smaller), apex acute to acuminate. Inflorescences usually leafy panicles. Pedicels slender. Flowers: calyx 4–5 mm, viscid; corolla usually 6+ mm, petals 4–5 mm. Schizocarps 5–6 mm diam.; mericarps muticous. Seeds 2 mm. 2n = 28.
Phenology: Flowering year-round.
Habitat: Shrublands, thickets, disturbed vegetation, pastures, roadsides
Elevation: 0–500 m
Tex., e Mexico, West Indies, Central America, South America (Colombia, Ecuador, Peru, Venezuela).
Bastardia viscosa is known only from the lower Rio Grande valley.