Kidneywood Tree. Eysenhardtia orthocarpa. Fabaceae Family ( Pea ) Kidneywood. Also Called: Eysenhardtia polystachya, Tahitian Kidneywood, Kidney Wood, or Palo Dulce. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. A deciduous; delicate tree-shrub with fragrant white flowers. Kidney wood or palo dulce (Eysenhardtia polystachya) is a deciduous; delicate tree-shrub with fragrant white flowers. A Kidneywood is in the Arizona Registery Of Big Trees in the Coyote Mountains Wilderness that is 21 feet tall and 25 feet wide. Quick Notes: Height: Normally, 3 To 20 feet tall; up to 18 feet wide. Trunk: 3 to 10 inches in diameter. Bark: Grayish-brown, thin, smooth or scaly. Twigs: Stiff, densely packed, gray barked branches. Flowers: Yellow to cream colored, very fragrant flowers arranged in 2 to 3 inch long, slender spikes. Blooming Time: Early March to mid - June. Seed Pod: Slender pods about 3 inches long, seeds are dark brown or black, hard. Leaves: Alternate and compound, with two to four (rarely five) pairs of leaflets, and they possess straight spines. Stems/Trunks: A redish-brown, finely furrowed bark. 3 to 14 inches in diameter. Found: The USDA claims it is native to the USA (AZ, NM). Native to Pinal, Pima, Graham, Santa Cruz, & Cochise counties in Arizona. Also native to the Sierra Madre Occidental of Eastern Sonora, Mexico. Elevation: Below 1,800 feet. Said to live up to about 4,500 feet. Hardiness: 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: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) Sun Exposure: Full Sun Habitat: Rocky hillsides, alluvial plains, canyon slopes, and hillsides, where some water is periodically available. Xeriscape ornamental in lower elevations or Arizona. Miscellaneous: Photos Taken Arizona - Sonora Desert Museum, September 29, 2006.

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