Amrita G. De Soyza, Walter G. Whitford, Ernesto Martinez-Meza, Justin W. Van Zee, Variation in Creosotebush (Larrea tridentata) Canopy Morphology in Relation to Habitat, Soil Fertility and Associated Annual Plant Communities, The American Midland Naturalist, Vol. 137, No. 1 (Jan., 1997), pp. 13-26
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Soyza et al. (1997) studied this question.
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