Abstract
Cyamopsis tetragonoloba, commonly called guar, produces two leaf forms: a simple leaf and a trifoliate leaf. During ontogeny, the simple leaf is always produced prior to the appearance of any trifoliate forms. The number of simple leaves initiated during the early phase of ontogeny is partially controlled by environmental conditions. Both short daylengths and high temperatures delay the production of the trifoliate form. Treatments using gibberellic acid and reduced light intensity favor production of simple leaves. Removing the cotyledons of young seedlings also favors the simple leaf form. Some consider a change in leaf form as an indication of a change from the juvenile phase to the adult phase of growth. However, in guar when the capability to reproduce is used as the basis for the determination of phase change, a change in leaf form is a separate phenomenon.
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