Hohoba Trees” Jojoba”

Jojoba Tree

Simmondsia chinensis

Family: Simmondsiaceae

Jojoba is a woody, evergreen shrub, averaging 2 to 5 feet (0.6-1.5 m) tall and wide, sometimes to 10 feet (3 m), with leathery, grayish-green leaves.

The pale green female flowers of this dioecious species are borne singly at each leaf node, the yellowish-green male flowers are borne in clusters.

Plants bloom in winter and female plants ripen their acorn-shaped and sized seeds in summer.

Though the flowers are wind-pollinated, the process is not completely passive. As breezes pass through the plants the leaves create vortexes. Pollen grains spiral around the female flowers hanging beneath the leaves and thus have several opportunities to contact the stigmas.

An average-size bush produces more than 2 pounds (a kilogram) of pollen. The ratio of male to female plants is 4 to 1 in Arizona. Fortunately, few people are allergic to the pollen.

Though it’s usually an evergreen, jojoba will shed its leaves during severe droughts. The vertical orientation of jojoba leaves is an adaptation to the extreme desert heat. During midday in summer, when high leaf temperatures make photosynthesis less efficient, the sun is shining on the edges of the leaves. In morning and late afternoon, light reaches the flat leaf surfaces more directly, at a time when temperatures are more favorable for energy capture.

Jojoba “beans” contain more than 40 percent “oil,” which chemically is actually a liquid wax. The wax is highly resistant to oxidation (going rancid) and is stable at high temperatures. These properties make it a very high quality lubricant, equal to sperm whale oil. Only sperm whale or jojoba oil is acceptable for some industrial applications. The wax is also used in cosmetics. For these reasons and because sperm whales are endangered, jojoba is being developed as a commercial crop in several countries. Selective breeding is developing plants that produce more beans with higher wax content, as well as other characteristics that will facilitate harvesting.

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