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Family: portulacaceae
Common name(s): bitter-root
Hardiness ratings: USDA zone 3~6 - 8~10 
General resources
Links for Lewisia cotyledon
- All Things Plants - Community-assembled plant profile (6 varieties in database)
 (22 photos)
- Alpine Garden Society - Ulster - Plant of the month profile (6 photos)
- Annie's Annuals: Lewisia cotyledon 'Magenta' - Catalog page with photo, basic horticultural information, and noteworthy features. (zone 6-10) (2 photos). Also a page for 'Sunset Strain'.
- BBC Gardening: Lewisia cotyledon Ashwood strain - Plant profile with horticultural details and garden uses. (1 photo). Also a page for Hybrids.
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 6-8) (13 photos)
- Denver Botanic Gardens - Description, native range, and cultural requirements. (additional pages for other varieties) (zone 6) (8 photos)
- Heritage Perennials: Lewisia cotyledon Hybrid Mixture - Profile with description and horticultural details. (additional pages for other varieties) (zone 3-9) (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 4-8) (1 photo)
- NARGS Image Gallery - Photograph(s) contributed by North American Rock Garden Society members. (2 photos)
- Ontario Rock Garden Society - Germination information. Also a page for Ashwood strain.
- Paghat's Garden - Illustrated articles by a gardener in the Pacific Northwest, with background and personal observations.. Also pages for another instance, another instance, another instance, another instance, 'Rondo', 'Siskiyou Pink', 'Sunset Pink', and 'Sunset Red'.
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (zone 4-8) (5 photos)
- Turner Photographics - Profile of wildflower of the US Pacific Northwest, with botanical description, habitat and distribution, and photo gallery.
- Wild Ginger Farm: Lewisia cotyledon 'Sunset Strain' - One of the plants featured on this specialty nursery's catalog page, with photo and brief description. (1 photo)
Links
- Paghat's Garden - Illustrated articles by a gardener in the Pacific Northwest, with background and personal observations. (1 photo)
Links
- Wild Ginger Farm - One of the plants featured on this specialty nursery's catalog page, with photo and brief description. (1 photo)
Links
- Paghat's Garden - Illustrated articles by a gardener in the Pacific Northwest, with background and personal observations. (2 photos). Also a page for another instance.
- Wild Ginger Farm - One of the plants featured on this specialty nursery's catalog page, with photo and brief description. (1 photo)
Common name(s): Button Rockrose
Links
- Wild Ginger Farm - One of the plants featured on this specialty nursery's catalog page, with photo and brief description. (1 photo)
Common name(s): Cliff Maids; Siskiyou Lewisia
Hardiness ratings: USDA zone 6
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