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Eriogonum umbellatum

Family: polygonaceae
Common name(s): Sulfur Flower
Hardiness ratings: USDA zone 3~4 - 8~10 This is a summary of the individual hardiness ratings given by the links below

General resources

Wikipedia. Online encyclopedia entry (if defined).
Google images. Web search for photographs.
The Plant List. Taxonomical lookup
Catalogue of Life. Taxonomical lookup

Links for Eriogonum umbellatum

Annie's Annuals (on archive.org) - Catalog page with photo, basic horticultural information, and noteworthy features. (zone 4-10) (2 photos)
Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 3-8) (8 photos)
Garden.org - Community-assembled plant profile (3 varieties in database) (2 photos)
Iris' Garden - Gardener in the Netherlands presents a photo of this plant, with basic horticultural information. (1 photo)
Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (9 photos)
Las Pilitas Nursery - Catalog page about this California native, with description and horticultural basics. (zone 4-10) (8 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 4-8) (1 photo)
NARGS Image Gallery - Photograph(s) contributed by North American Rock Garden Society members. (1 photo)
North Carolina State University factsheet - Plant profile with horticultural details and comments (zone 4-8) (5 photos)
Ontario Rock Garden Society - Germination information (use search on page to find this taxon)
Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (zone 4-10)
Southwest Colorado Wildflowers - Photos and botanical information about the species/genus. (9 photos)