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| Ribes fujisanense S. Sakag. & Mit. Oishi, in Sakaguchi, Oishi, Takahashi, Matsuo, Hirota, Suyama et Setoguchi, 2022. |
Abstract
Ribes fujisanense S. Sakag. & Mit. Oishi (Grossulariaceae), an obligate epiphytic gooseberry, is described here for the first time. It is narrowly endemic in the cool-temperate forests of Mt. Fuji and adjacent areas of central Japan. Ribes fujisanense is morphologically most similar to R. ambiguum Maxim., but is distinguished by the reddish apex of the calyx lobes, branchlets armed with prickles, petioles with long glandular trichomes and more deeply lobed leaf blades. Phylogenetic analysis based on genome- wide markers showed that the two species are considerably divergent, even though R. fujisanense fully overlaps the distribution of the wide-ranging R. ambiguum, indicating that they are biologically isolated species.
Keywords: epiphyte, Grossulariaceae, Ribes, SNPs, taxonomy
Ribes fujisanense S. Sakag. & Mit. Oishi, sp. nov.
Similar to Ribes ambiguum Maxim., but distinguished by multiple characteristics including color of the calyx lobes (pale greenish with apex tinged reddish in R. fujisanense vs. entirely pale greenish in R. ambiguum), branchlets (armed with prickles vs. unarmed), trichomes on abaxial surface of petiole (long glandular vs. short non-glandular or rarely glabrous), and leaf blade (deeply lobed and tender vs. shallowly lobed and robust); phylogenetically independent from R. ambiguum; restricted to cool-temperate cloud forests (1,300–1,750 m a.s.l.) on Mt. Fuji and surrounding areas of central Honshu, Japan.
Shota Sakaguchi, Mitsuru Oishi, Daiki Takahashi, Ayumi Matsuo, Shun K. Hirota, Yoshihisa Suyama and Hiroaki Setoguchi. 2022. Ribes fujisanense (Grossulariaceae): A New obligate epiphytic Species of Gooseberry Discovered in Central Japan. Acta Phytotax. Geobot. 73(1); 49-56. DOI: 10.18942/apg.202109
www.jstage.jst.go.jp/article/apg/73/1/73_202109/_pdf/-char/en
