Section Douglasia is a North American section within the genus Crataegus of species with black fruit.[1]

Series

Series in section Douglasia include:[1]

See also

References

  1. ^ a b c Phipps, J.B. (2015), "Crataegus Linnaeus sect. Douglasia Loudon, Arbor. Frutic. Brit. 2:816 1838", in L. Brouillet; K. Gandhi; C.L. Howard; H. Jeude; R.W. Kiger; J.B. Phipps; A.C. Pryor; H.H. Schmidt; J.L. Strother; J.L. Zarucchi (eds.), Flora of North America North of Mexico, vol. 9: Magnoliophyta: Picramniaceae to Rosaceae, New York, Oxford: Oxford University Press, pp. 502–514