Illecebrum densum Humboldt & Bonpland ex Schultes in J. J. Roemer et al., Syst. Veg. 5: 517. 1819; Brayulinea densa (Willdenow ex Roemer & Schultes) Small

Varieties 3 (1 in the flora): North America, South America; naturalized in s Africa and e Australia.

Guilleminea densa var. densa has been reported from several U. S. states (e.g., J. T. Kartesz and C. A. Meacham 1999). J. Henrickson (1987) implicitly rejected those records, stating that the variety "as considered here is widespread in South America, naturalized in southern Africa, and Queensland, Australia, but does not occur in North America."