討論:Crataegus

山羊百科，林文智老師的植物、山岳、攝影紀錄

• Illustriertes Handbuch der Laubholzkunde Illustriertes Handbuch der Laubholzkunde; 1904 https://archive.org/stream/mobot31753002689237#page/768/mode/1up

• Persoon, Syn. Pl. 2: 36 1806；https://www.biodiversitylibrary.org/item/11127#page/39/mode/1up

Synopsis plantarum,seu Enchiridium botanicum, complectens enumerationem systematicam specierum hucusque cognitarum

• Crataegus severa Sarg., Trees & Shrubs [Sargent] 2: 59, pl. 127 (1908).；https://www.biodiversitylibrary.org/page/39881059#page/97/mode/1up