Pentactina

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Pentactina
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Rosales
Family: Rosaceae
Genus: Pentactina
Nakai (1917) [1]
Type species
Pentactina rupicola
Nakai (1917) [2]

Pentactina is an oligotypic genus of flowering plants in the family Rosaceae, first described by the Japanese botanist Takenoshin Nakai in 1917. [1] [3] The genus occurs in restricted areas of North Korea and the Russian Far East. [3]

Contents

Description

Shrub deciduous. Leaves alternate, simple, without stipules. Inflorescence a terminal panicle. Flower calyx 5-lobed, calyx lobes reflexed during flowering; petals 5, white, linear; stamens 20; carpels 5; ovules 2 per carpel. Fruit follicles, dorsiventrally dehiscent. [4]

Classification

Taxonomic history

Pentactina was long considered a monotypic genus, represented by its type species Pentactina rupicola Nakai [2] , which is narrowly endemic to North Korea. Its taxonomic treatment was controversial due to the rarity and limited accessibility of P. rupicola: some botanists treated Pentactina as a synonym of the genus Spiraea L., [5] [6] while others supported its generic distinctiveness based on morphological and phylogenetic evidence. [7] [8]

In 2014, Russian botanist V. V. Yakubov published a new combination, Pentactina schlothauerae (Vorosch. & Ignatov) Jakubov [9] , based on morphological comparisons, transferring the species from Spiraea . [4] A subsequent biochemical analysis supported this revision, showing that the phenolic compound composition of P. schlothauerae differed from that of Spiraea species. [10] A later phylogenetic study substantiated a sister relationship between P. rupicola and P. schlothauerae, forming a distinct lineage within the tribe Spiraeeae, separate from other genera including Spiraea. [11]

Species

The genus Pentactina currently comprises two species [1] [3] :

Distribution

Pentactina rupicola is endemic to the Kumgangsan Mountains in North Korea, and P. schlothauerae is endemic to the Badzhal Range in the Russian Far East. [4] [11]

References

  1. 1 2 3 "Pentactina Nakai". International Plant Names Index (IPNI). Royal Botanic Gardens, Kew; Harvard University Herbaria & Libraries; Australian National Botanic Gardens . Retrieved 2025-10-31.
  2. 1 2 3 "Pentactina rupicola Nakai". International Plant Names Index (IPNI). Royal Botanic Gardens, Kew; Harvard University Herbaria & Libraries; Australian National Botanic Gardens . Retrieved 2025-10-31.
  3. 1 2 3 "Pentactina Nakai | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 19 May 2021.
  4. 1 2 3 Yakubov, V. V. (2014). "The genera Pentactina and Geum (Rosaceae) in the Russian Far East". V. L. Komarov Memorial Lectures. 62: 229–240.
  5. ↑ Hutchinson, J. (1964). The Genera of Flowering Plants. Vol. 1. Dicotyledones. Oxford: Clarendon Press.
  6. ↑ Kalkman, C. (2004). "Rosaceae". In Kubitzki, K. (ed.). The Families and Genera of Vascular Plants, Vol. VI. Flowering Plants; Dicotyledons; Celastrales, Oxalidales, Rosales, Cornales, Ericales. Berlin: Springer. pp. 343–386. ISBN   9783662072578.
  7. ↑ Lee, C.; Hong, S.-P. (2011). "Phylogenetic relationships of the rare Korean monotypic endemic genus Pentactina Nakai in the tribe Spiraeeae (Rosaceae) based on molecular data" . Plant Systematics and Evolution. 294 (3): 159–166. doi:10.1007/s00606-011-0457-8. ISSN   1615-6110.
  8. ↑ Song, J.-H.; Roh, H.-S.; Hong, S.-P. (2020). "Petal micromorphology and its systematic implications in Rosaceae tribe Spiraeeae" . Brittonia. 72 (2): 111–122. doi:10.1007/s12228-020-09609-w. ISSN   1938-436X.
  9. 1 2 "Pentactina schlothauerae (Vorosch. & Ignatov) Jakubov". International Plant Names Index (IPNI). Royal Botanic Gardens, Kew; Harvard University Herbaria & Libraries; Australian National Botanic Gardens . Retrieved 2025-10-31.
  10. ↑ Kostikova, V.A. (2018). "Phenolic compounds in Pentactina schlothauerae (= Spiraea schlothauerae)". Proceedings of Universities Applied Chemistry and Biotechnology. 8 (1): 74–81. doi: 10.21285/2227-2925-2018-8-1-74-81 . ISSN   2227-2925.
  11. 1 2 Jeon, J.-H.; Kim, S.-H.; Marchuk, E. A.; Koldaeva, M. N.; Kim, S.-C. (2025). "A taxonomic revision of the rare genus Pentactina (Rosaceae) based on comparative phylogenetic analyses". Korean Journal of Plant Taxonomy. 55 (1): 1–13. doi: 10.11110/kjpt.2025.55.1.1 . ISSN   1225-8318.
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