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Family: rutaceae
Common name(s): hop tree
Hardiness ratings: USDA zone 3~5 - 9 
General resources
Links for Ptelea trifoliata
- Carolina Nature - Illustrated woody plant profile, with notes on range and identification.
 (25 photos)
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 5-9) (8 photos)
- Denver Botanic Gardens - Description, native range, and cultural requirements. (zone 3) (8 photos)
- Floridata - Illustrated informative profile page with notes on culture, usage, and noteworthy features. (zone 4-9) (2 photos)
- Garden.org - Community-assembled plant profile (4 photos)
- Hayefield: Ptelea trifoliata ‘Aurea’ - Garden writer Nancy Ondra presents a plant growing in her garden, with description and photographs. (1 photo)
- Illinois Wildflowers - Informative illustrated page with description and cultivation details, also covering range and faunal associations. (3 photos)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (60 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 4-9) (8 photos)
- Missouri Plants - Description and photographs of botanical features, with notes about habitat and native status. (11 photos)
- Native Plants of Central Texas - Photos with brief comments from University of Texas at Austin. (8 photos)
- North Carolina State University factsheet - Plant profile with horticultural details and comments (zone 3-9a) (8 photos)
- Ontario Rock Garden Society - Germination information. Also a page for 'Aurea'.
- Virginia Tech Dendrology - Factsheet with botanical characteristics and photos of various features. (5 photos)
Common name(s): Smooth Hoptree
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