More info for the terms: density, resistance
Brittle bush leaves and flowers are formed whenever the water relations
are favorable . This can occur any time from November through May
. Under extreme drought conditions brittle bush becomes dormant and
the leaves are shed [21,50]. Brittle bush also shows seasonal variation
in leaf density and thickness. During times of available water, leaves
expand more, are less pubescent, are less capable of reducing water
loss, and have lower resistance to carbon dioxide flux. These
characteristics are reversed as soil water decreases and the more
mesophytic leaves abscise .
- 8. Cannon, William Austin. 1911. The root habits of desert plants. Washington, DC: The Carnegie Institution of Washington. 96 p. 
- 21. Levin, Geoffrey A. 1988. How plants survive in the desert. Environment Southwest. Summer: 20-25. 
- 35. Shreve, F.; Wiggins, I. L. 1964. Vegetation and flora of the Sonoran Desert. Stanford, CA: Stanford University Press. 2 vols. 
- 50. Cunningham, G. L.; Strain, B. R. 1969. An ecological significance of seasonal leaf variability in a desert shrub. Ecology. 50: 400-408. 
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