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Abstract ▼ AI-Helper

Ten species of the genus Polygonum (Polygonaceae), which were regarded as important weeds in Korea, were studied on their morphological characters such as trichomes, prickles, glands and colours of leaf blade and stem in early development stages in leaf blades, petioles, stipules, and stems. As a re...

Ten species of the genus Polygonum (Polygonaceae), which were regarded as important weeds in Korea, were studied on their morphological characters such as trichomes, prickles, glands and colours of leaf blade and stem in early development stages in leaf blades, petioles, stipules, and stems. As a results, three identification keys were developed. It would be helpful to identify young plants in fields. Polygonum perfoliatum and P. senticosum var. senticosum had prickles on petioles and stems. however, these species distinguished by the position to which petioles were attached, and stipule at apex. Polygonum orientale and P. viscosum has densely hairs on entire plant. These species had differences in length of hairs and in morphologies of stipules and leaves. Polygonum thunbergii and P. nepalense have a V-shaped longitudinal groove on stems, the former has leaves showing rough texture due to stellate hairs on adaxial surfaces, but the later has prominent glands on abaxial surfaces. The morphological characters of stipules could be used for divide the Polygonum species into two groups, i..e. winged-type vs truncated-type. Interestingly, the leaves of Polygonum hydropiper stinged. Leaf morphology of these ten Polygonum species were five types: deltoid (P. perfoliatum and P. senticosum var. senticosum) auriculate (P. thunbergii) ovate (P. nepalense and P. orientale) and lanceolate or oblong(the rest five species).

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