A Taxonomic Study in Early Stage on the Genus Conyza and Erigeron (Asteraceae) Weeds of Korea
2008
Kim, C.S. (National Institute of Agricultural Science and Technology, RDA, Suwon, Republic of Korea), E-mail: cskim@rda.go.kr | Chung, Y.J. (Shingyeong University, Hwaseong, Republic of Korea) | Oh, Y.J. (National Institute of Agricultural Science and Technology, RDA, Suwon, Republic of Korea) | Oh, S.M. (National Institute of Agricultural Science and Technology, RDA, Suwon, Republic of Korea)
This study was conducted to make the easy identification methods in early growing stages to seven taxa of the genus Conyza (Conyza conadensis, C. sumatrensis, C. bonariensis, C. parva) and Erigeron (Erigeron annuus, E. strigosus, E. philadelphicus) weeds in korea. In the rosette stage, the hair in petiole and leaf blade were very useful characters for identification of the seven taxa. The length of hair on the petiole of E. strigosus was within 1mm long, while the others were 2~3 long. All over the petiole of C. bonariensis were covered with dense hair. In genus Erigeron, only E. philadelphicus was covered with dense hair below part of the petiole. In the bolting stage, distribution pattern, texture, color of hair on stem were very useful characters. The hair patterns on stem were four types as fallows : 1) entirely uniform hair of stem, 2) sparsely hair of upward stem and densely hair of downward stem, 3) densely hair of downward stem and densely strigose on the vertical striations, 4) sparsely or densely hair of downward stem and glabrousor shortly sparse hair of upward stem. The stem of E. philadelphicus had hollowed pith, while others were filled solidly with white cancellate tissue. The forms of cauline leaf such as leaf margin and leaf base could be divided into two group; same shape and difference shape by the form of upper and lower leaf. Therefore morphological characters of cauline leaf were very useful characters for identify.
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