The desert of full of spiny leafless green bushes. Leaves present a large surface to the sun and are great organs for photosynthesis, but they also lose a lot of water through transpiration. Green stalks can carry on photosynthesis while minimizing water loss. Of course, they also present a smaller surface to the sun. So this is a thorny problem (yes, I meant that) which plants have to solve: more photosynthesis or less water loss?
The local name for the green bush full of upright stalks which you can see in the photo above is khimp. The plant grows along the extreme arid zone which crosses from Mauritania to India through the Sahel, the Arabian desert and the Thar desert. A search for the origin of the botanical name Leptadenia pyrotechnica led me to this book, which claims that the name pyrotechnical comes from the observation that Bedouins use tinder to set alight the fibrous stems of this plant. Later compilations noted that the high fiber content of the stems has been used by people across its geographical range in various ways. Some have used it to make ropes, others in diet to cure anything from constipation to obesity. Although I never thought of breaking off a stem to look at the sap, I’m told that it gives a clear sap. This is probably one of the reasons why camels are said to be fond of it.
There is a claim that extracts from plant was found to be mildly damaging to liver cells in a lab. On the other hand it is said to be eaten. Browsing the net, I came across a recipe for cooking khimp. Here is a translation: “Cut the stems and boil them. Remove them from water and press to drain the liquid. Separately cook spices in oil and add the boiled stems. Add a little buttermilk to cook further, thickening it with besan (chickpea flour) as needed.” The double cooking of the stems probably serves not only to tenderize the material, but also to denature toxins. The pressing and draining may also remove any toxins.
They grow along with phog on dunes and other dry sandy places. In various countries around the world people are experimenting with using L. pyrotechnica as a biological barrier to the spreading of dunes. But when I stood on top some dunes and took the photo above, I did not know that this could also be a weapon against cancer.