Preliminary Investigation of Factors Determining the Growth Form of Cerastium Tetrandrum Curt

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Abstract
An account is given of the varia-tion found in nature of the growth form of C. tetrandrum. Seeds from various naturally occurring phenotypes were grown under controlled conditions and the variability of growth form was greatly reduced, indicating that this species has a degree of phenotypic flexibility greater than genotypic. Various environmental factors are considered in relation to this flexibility. Results of detailed studies of the relationship between morphology and anatomy to light intensity are given. It appears that light intensity has an important effect on the physiognomy of this species and the variation can probably be considered adaptative.