@techreport{oai:soar-ir.repo.nii.ac.jp:00016613,
 author = {荒瀬,  輝夫 and 岡野,  哲郎 and 内田,  泰三},
 month = {Mar},
 note = {The purpose of this report is to quantify leaf-base shapes for the field survey of　plants. We analyzed the property of cardioid (limacon) curve, r＝(1－k) + k cos (sita), and　confirmed that the coefficient k was able to express the leaf-base shapes: rotundate, obtuse,　truncate, reniform, and cordate. In the leaf-shape analysis of two closely-related species,　Reynoutria japonica and R.sachalinensis, only an interspecies difference was detected in　the leaf size and other leaf-shape indices. Coefficient k revealed both interspecies and　sexual differences clearly; k= 0.33-0.34 (almost truncate) in male and female in R.　japonica, whereas k= 0.41 (reniform) in female and 0.54 (cordate) in male in R.　sachalinensis. This method will facilitate the statistical analysis and ordination of leaf　shape, without the use of image processing techniques., Article, 環境科学年報32:60-64(2010)},
 title = {葉の基部形の数量化によるイタドリ属2種の葉形比較},
 year = {2010}
}