- 著者
- Shinji Fujii Nobuhira Kurosaki
- 出版者
- The Japanese Society for Plant Systematics
- 雑誌
- Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
- 巻号頁・発行日
- vol.74, no.1, pp.17-27, 2023-02-28 (Released:2023-03-15)
Carex planata has been treated as comprising three varieties: var. planata, var. angustealata, and var. remotiuscula. To evaluate this treatment, characteristics of the inflorescences, spikes, utricles, and achenes of both herbarium specimens and growing plants in the field were examined. Principal component analysis (PCA) revealed two distinct groups within C. planata, one of which was identical to var. angustealata and the other to var. planata; var. remotiuscula could not be distinguished from var. planata. Variety remotiuscula was confirmed to be a synonym of var. planata. Variety angustealata of western Japan grows in flood plains along rivers. The results from PCA and information from distribution and habitat led to the conclusion that var. angustealata should be treated as a distinct species: C. angustealata, characterized by ascendant utricles and a greater number of spikes (≥ 9) on well-grown plants. Smaller achenes in proportion to the utricles also distinguish C. angustealata from C. planata. Detailed descriptions of both C. angustealata and C. planata based on the numerical survey are presented. Lectotypes of var. angustealata Akiyama and var. remotiuscula Akiyama are designated.
- 著者
- TADASHI YAMASHIRO ASUKA YAMASHIRO MAKOTO OGAWA NOBUHIRA KUROSAKI TOMIKI KOBAYASHI MASAYUKI MAKI
- 出版者
- The Japanese Society for Plant Systematics
- 雑誌
- Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
- 巻号頁・発行日
- vol.63, no.1, pp.29-40, 2012-10-31 (Released:2017-03-21)
- 参考文献数
- 36
We examined morphological differentiation and allozyme diversity in nine populations of Vincetoxicum katoi and its close relative V. yamanakae. Although, V. yamanakae has been distinguished from V. katoi in having a larger corolla and gynostegium, the principal component analysis based on 12 floral and three leaf characters did not support the distinction of the two taxa. The six allozyme loci examined revealed that population of V. katoi and V. yamanakae maintained high genetic diversity (P=72.1, A=2.40, h=0.313). The nine populations were clustered into three regions (Kanto-Tokai; middle Kiniki; and Kii-Shikoku) based on genetic differences, contradicting the current taxonomic treatment. Considering the evidence, it is appropriate to treat V. yamanakae as a synonym of V. katoi. The high genetic differentiation among regions suggested that disjunct distribution of the V. katoi-V. yamanakae complex might reflect the persistence of refugia since the last glacial period. In particular, the middle Kinki (Hyogo) population is located outside of known evergreen forest refugia, suggesting that it might have survived during the glacial period within cooler vegetative zones, such as in temperate forests, whereas the populations on the Pacific-side retreated to warm-temperature coastal refugia.