Morphological differentiations between subspecies in Arisaema thunbergii (Araceae) with special reference to sexual dimorphism

Takahiro Omori, Jenn Che Wang, Jin Murata

Research output: Contribution to journalArticle

Abstract

In Arisaema thunbergii Blume, two Japanese subspecies, subsp. thunbergii and subsp. urashima (H. Hara) H. Ohashi & J. Murata, and subsp. autumnale J. C. Wang, J. Murata & H. Ohashi, recently described from Taiwan, have been recognized. Morphological variations in A. thunbergii between these subspecies are examined with special reference to sexual dimorphism and are discussed here in order to characterize each subspecies more clearly. We observed natural populations of subsp. autumnale in Taiwan and examined the number of leaflets and the length of peduncle, petiole, rachis, and terminal leaflet using dried specimens of all the subspecies. Differences between sexes were recognized in the peduncle/petiole length ratio in all subspecies. The degree of difference was most extreme in subsp. autumnale. The Taiwanese subsp. autumanale could be distinguished from the other subspecies in every character examined, while Japanese subspecies showed some similarities in leaf morphology and dissimilarities in peduncle length to each other. The differences in morphology and flowering season may suggest that the Taiwanese subspecies is a distinct species.

Original languageEnglish
Pages (from-to)247-254
Number of pages8
JournalJournal of Japanese Botany
Volume79
Issue number4
Publication statusPublished - 2004 Aug

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Arisaema
Araceae
sexual dimorphism
peduncle
subspecies
Taiwan
flowering
gender
leaf morphology
leaves

Keywords

  • Arisaema thunbergii subsp. autumnale
  • Morphology
  • Sexual dimorphism

ASJC Scopus subject areas

  • Plant Science

Cite this

Morphological differentiations between subspecies in Arisaema thunbergii (Araceae) with special reference to sexual dimorphism. / Omori, Takahiro; Wang, Jenn Che; Murata, Jin.

In: Journal of Japanese Botany, Vol. 79, No. 4, 08.2004, p. 247-254.

Research output: Contribution to journalArticle

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