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Geographical Variations in the Morphology of Ornamental Flower and Leaf of
Hydrangea serrata var. yesoensis (Hydrangeaceae) in Central and Southern Niigata
Prefecture
Teruo ARASE
Faculty of Agriculture, Shinshu University
Summary
The range of the white-flower type of yama-ajisai (Hydrangea serrata var. serrata) covers Nagano
Prefecture, and ezo-ajisai (H. serrata var. yesoensis, with blue flower) and an intermediate type between the
two varieties are found in the northern part of the prefecture. To understand the characteristics of the
intermediate type, it is necessary to characterize the morphology of the ornamental flower and the leaf of
ezo-ajisai in an area without yama-ajisai and compare it to the characteristics of the yama-ajisai with
consideration of geographical distribution. Seven survey sites from central and southern Niigata Prefecture
were established, and individual leaf area, flower diameter and flower color (b*, indicating the degree of
blue, based on L*a*b* color coordinates) were measured on 4 individuals per site. Significant differences
were obtained for individual leaf area (53.8 and 83.4 cm2), flower diameter (2.4 and 3.8 cm) and flower color
(-33.4 and -17.3) between the central and southern sites, respectively. The range of each trait overlapped
with those of yama-ajisai in Nagano Prefecture; individual leaf area and flower diameter were larger, and b*
value was smaller (i.e., light purple to deep blue) in ezo-ajisai compared to yama-ajisai. However, no
geographic variations with latitude were observed in these traits.
Key words: ezo-ajisai (Hydrangea serrata var. yesoensis), geographical variation, ornamental flower, flower
color, leaf
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