. Experiments with plants. Botany. MAKING NiJW KINDS OF PLANTS 4-t9 There is a well-known freak or monstrosity occur- ring in many species of plants in which the leaf splits lengthwise more or less completely. This occurs occasionally among the Red Clover plants just described, and gives rise to leaves with higher numbers (four to fourteen). For exarnple, a five- leaf may, l)y splitting, become a ten-leaf, such as is shown in Fig. OnO Professor de Vries believes. 252. Ten-leaved Clover. that this is to be classed as a mon- strosity and is quite different from the four-, five-, six-, and seven-
. Experiments with plants. Botany. MAKING NiJW KINDS OF PLANTS 4-t9 There is a well-known freak or monstrosity occur- ring in many species of plants in which the leaf splits lengthwise more or less completely. This occurs occasionally among the Red Clover plants just described, and gives rise to leaves with higher numbers (four to fourteen). For exarnple, a five- leaf may, l)y splitting, become a ten-leaf, such as is shown in Fig. OnO Professor de Vries believes. 252. Ten-leaved Clover. that this is to be classed as a mon- strosity and is quite different from the four-, five-, six-, and seven-leaves just described, which are due to fluctuating variation and obey mathematical laws. It occurs rarely, appears and disappears suddenly, bears no constant relation to the whole number of leaves, and is to be classed as a sudden variation. Occasionally a Clover leaf is met with of the form shown in Fig. 253. It might at first sight be classified as one of the abnornialities just described. When we consider, how- ever, that the arrangement of the leaflet in two rows, one each side of the stalk, is the same as that possessed by the allies of the Clover and the arrangement which the ancestors of Clover itself probably had a long time ago, it seems prob- cc. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Osterhout, Winthrop John Van Leuven, 1871-. New York, The Macmillan company; London, Macmillan & co. , ltd.
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