• Korean Journal of Plant Taxonomy
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• v.48 no.2
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• pp.143-152
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• 2018

A comparative study of leaf epidermal microstructures in genus Aruncus (two species, five varieties) was carried out using scanning electron microscopy in order to evaluate their significance in terms of taxonomy. All of the leaves of the taxa studied here were amphistomatic with undulate anticlinal walls, and smooth and flat periclinal walls on both surfaces. The size range of the stomata complex is $8.95-21.97{\times}7.50-16.99{\mu}m$: the largest one was found in Aruncus dioicus var. astilboides (average $18.01{\times}13.47{\mu}m$) and the smallest was measured and determined to be A. gombalanus (average $11.11{\times}8.94{\mu}m$). An anomocytic stomata complex was found in all of the studied taxa. The stomatal frequency on average was $27.54/0.05mm^2$; it is highest in A. gombalanus ($60.4/0.05mm^2$) and lowest in A. dioicus var. acuminatus ($11.6/0.05mm^2$). Two types (short stalked capitate glandular trichome and non-glandular trichome) of trichomes are found in the leaves. The non-glandular trichome was divided into three types based on the presence and degree of development of subsidiary cells. Anomocytic stomata of the hypostomatic type and the distribution pattern of capitate glandular trichomes were the major characters in this genus. The stomata size and frequency, the epidermal cell structure, the trichome type and the distribution pattern may have diagnostic importance among the taxa in the genus. Our leaf micromorphological results provide useful information for the taxonomic revision of the genus Aruncus.

• Korean Journal of Plant Taxonomy
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• v.45 no.4
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• pp.369-379
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• 2015

The seed morphology of 25 taxa (8 genera) of Alsineae (Alsinoideae, Caryophyllaceae) in Korea was examined using stereo (SM) and scanning electron microscopy (SEM) in order to evaluate their diagnostic values and taxonomic implications. Circular, comma-shaped, ellipsoid, ovate, pyriform, reniform, and sub-circular seed shapes were identified. The seeds of the examined taxa range from 0.28 to 4.10 mm in length and from 0.33 to 3.10 mm in width; the smallest one was found in Sagina japonica, while the largest was in Honkenya peploides var. major. A hilar appendage was found in Cerastium, Honkenya, Moehringia, and strophioles were only observed in the genus Moehringia. Based on the examination of epidermal cells of the seed surface, four micromorphological types can be distinguished, viz., the colliculate-papillate (Col-Pap), colliculate-columellate (Col-Cll), colliculate-simple (Col-Sim), and smooth (Sm) types. Descriptions of the testa shape, margin, and the degree of elevation of the anticlinal cell walls, and the outer periclinal cell walls are summarized for the tribe. Taxonomic implications of the seed micromorphological characters were also discussed, in comparison with an earlier taxonomic system.

• Korean Journal of Plant Resources
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• v.36 no.4
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• pp.299-313
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• 2023

Stellaria pallida (Dumort.) Crép., S. ruderalis M. Lepší, P. Lepší, Z. Kaplan & P. Koutecký, and Cerastium pumilum Curtis are unrecorded alien species of Caryophyllaceae found in Seoul and Gyeonggi-do in the Republic of Korea. Stellaria pallida is readily distinguished from other taxa in the same genus by its petals, as it's considerably smaller than the sepals or absent. In contrast, S. ruderalis is difficult to identify as it has intermediate traits between S. media L. and S. neglecta (Lej.) Weihe. However, S. ruderlais clearly identified by seed morphology, and S. ruderalis, unlike S. media and S. neglecta, has conical shape of outer periclinal wall and papillate on the basely surface of that. Cerastium pumilum is similar to C. glomeratum Thuill. and belongs to the same subgenus (Sub gen. Fugacia); however, it has some distinct characteristics, including stamens that are primarily 8 (5-10), upper bracts with membranous edges, and the length of the pedicels and petals being longer than that of the sepals. The three of alien plants was recorded for the first time in this study, and information of their habitat, distribution map, description and photographs are presented.