討論:Crataegus
山羊百科,林文智老師的植物、山岳、攝影紀錄
- 《中国植物志》 第36卷 (1974) >> 186页 PDF >> 山楂属 Crataegus;http://www.iplant.cn/info/CRATAEGUS?t=z
- CRATAEGUS;Flora of North America;http://floranorthamerica.org/Crataegus
- 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
- Sarg., Rhodora 5: 150 (1903).;https://www.biodiversitylibrary.org/page/562122#page/158/mode/1up
- Crataegus severa Sarg., Trees & Shrubs [Sargent] 2: 59, pl. 127 (1908).;https://www.biodiversitylibrary.org/page/39881059#page/97/mode/1up