Width of Petal lobe in mm 
Variability in Stellaria Graminea. 
77 
are also partly influenced by the shape of the petals. Thus the 
corollas, in individuals where the petal-lobes are equi-distant from 
one another, are ten-rayed; but in individuals where the edges of 
the neighbouring lobes of adjacent petals touch one another or 
overlap, the “star” is five-rayed. 
The correlation between the diameter of the corolla and the 
width of its segments is displayed diagrammatically in Fig. 2, where 
the corolla measurements for a large number of plants are recorded. 
The letters W and H signify Wisley and Huntingdonshire plants 
respectively. The horizontal column indicates the width of the 
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