The botanical magazine = Shokubutsu-gaku-zasshi

, Volume 88, Issue 4, pp 267–279 | Cite as

Floral anatomy and embryology ofTripetaleia paniculata andT. bracteata (Ericaceae)

  • Takasi Yamazaki


Floral anatomy and embryology of the genusTripetaleia were studied for the purpose of comparison with related genera. InT. paniculata the upper petal is supplied by two closely located bundles derived from independent gaps, and each of the two lower petals is supplied by a single bundle which forks promptly into three parts. InT. bracteata the vascular system of the upper petal is identical with that of the former, but each of the two lower petals is supplied by two bundles derived from a single gap. This structure suggests that each petal of both species may have been derived from fusion of two petal units. It has been reported that species belonging to the tribe Cladothamneae, includingTripetaleia, lack the chalazal endopserm haustorium. In the present study, however, a well-developed chalazal endosperm haustorium has been found in both species ofTripetalei. In the initial stages of embryo development of both species, the first two divisions give rise to a linear row of four cells. InT. paniculata the uppermost cell of these four divides transversely to form two superposed cells, then two longitudinal divisions follow in each cell to form the octant. This pattern of the embryo development has not been found previously in the Ericaceace.


Megaspore Mother Cell Single Bundle Antipodal Cell Floral Anatomy Transverse Division 
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Copyright information

© The Botanical Society of Japan 1975

Authors and Affiliations

  • Takasi Yamazaki
    • 1
  1. 1.Botanical Gardens, Faculty of ScienceUniversity of TokyoTokyo

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