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Family: rosaceae
Common name(s): Western Thorn Apple, Hawthorn, Douglas Thorntree, Black Haw
Hardiness ratings: USDA zone 3~5 - 8~9 
General resources
Links for Crataegus douglasii
- Arthur Lee Jacobson - Seattle plantsman describes botanical and/or horticultural aspects of this species.
 (4 photos)
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 5-9) (4 photos)
- Denver Botanic Gardens - Description, native range, and cultural requirements. (4 photos)
- Garden.org - Community-assembled plant profile (1 photo)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (3 photos)
- Las Pilitas Nursery - Catalog page about this California native, with description and horticultural basics. (zone 5-9) (3 photos)
- Missouri Botanical Garden - Plantfinder page for one of the plants growing at the garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (zone 3-9) (2 photos)
- North Carolina State University factsheet - Plant profile with horticultural details and comments (zone 4-8) (7 photos)
- Trees and Shrubs Online - Reference page curated by the International Dendrology Society with descriptive characteristics and horticultural notes.
- Turner Photographics - Profile of wildflower of the US Pacific Northwest, with botanical description, habitat and distribution, and photo gallery.
- Virginia Tech Dendrology - Factsheet with botanical characteristics and photos of various features. (6 photos)
- Washington Native Plant Society - Photo and brief description. (20 photos)
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