Wild Rhubarb. Rumex hymenosepalus, Buckwheat Family: ( Polygonaceae ), Wild Rhubarb: Also Called: Canaigre, Canaigre Dock, Wild Pie-Plant, Ganagra, Tanner's Dock, or Desert Rhubarb. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. A perennial herb. There are 15 species in Arizona. The roots are rich in tannin, with the dried root containing about 35 - 60% tannin. Quick Notes: Height: Up To About 18 - 30 Inches Tall. Flowers: Yellow with 5 petals and they are up to 1/5 inches wide. Flowering Time: February - April. Leaves: No petals; 6 petaloid or sepaloid sepals, rarely 4; stamens usually 6; 1 pistil; Small flowers in clusters usually greenish to pinkish in color; flower cluster 4� to 16� long. They are replaced by showy pink/red/brown seed pods. Found: Native to the USA (AZ, CA, CO, NM, NV, OK, TX, UT, WY). Also native to northern Mexico in northern Sonora, northern Chihuahua, Baja Norte, Baja California, & Coahuila. Hardiness: USDA Zone 3a: to -39.9 �C (-40 �F) USDA Zone 3b: to -37.2 �C (-35 �F) USDA Zone 4a: to -34.4 �C (-30 �F) USDA Zone 4b: to -31.6 �C (-25 �F) USDA Zone 5a: to -28.8 �C (-20 �F) USDA Zone 5b: to -26.1 �C (-15 �F) USDA Zone 6a: to -23.3 �C (-10 �F) USDA Zone 6b: to -20.5 �C (-5 �F) USDA Zone 7a: to -17.7 �C (0 �F) USDA Zone 7b: to -14.9 �C (5 �F) USDA Zone 8a: to -12.2 �C (10 �F) USDA Zone 8b: to -9.4 �C (15 �F) USDA Zone 9a: to -6.6 �C (20 �F) USDA Zone 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) USDA Zone 10b: to 1.7 �C (35 �F) USDA Zone 11: above 4.5 �C (40 �F) Soil pH requirements: 5.6 to 6.0 (acidic) 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline) Sun Exposure: Full Sun Elevation: 0 - 6,000 Feet. Usually found above 800 feet. Habitat: The desert environs, where it occupies open, gravelly, sandy, rocky areas, washes, and roadsides. It can also be found growing in almost any unshaded area, including flower beds, fields, and waste places. Miscellaneous: Flowering Photos Taken April 1, 2007. Near Congress Junction, Arizona.

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