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WOOD AND BARK ANATOMY OF AZIMA TETRACANTHA LAM. (SALVADORACEAE)
Author(s) -
Den Outer R. W.,
Van Veenendaal W. L. H.
Publication year - 1981
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1981.tb00401.x
Subject(s) - phloem , xylem , secondary growth , botany , biology , bark (sound) , sieve tube element , sieve (category theory) , anatomy , ecology , mathematics , combinatorics
SUMMARY The anatomy of the secondary phloem and xylem of the large shrub Azima tetracantha Lam. (Salvadoraceae) from Madagascar, has been studied. The presence of included (interxylary) secondary phloem, previously only known in the two other genera of this family, Dobera and Salvadora , has been demonstrated. The phloem strands in the secondary xylem belong to the foraminate or Strychnos type. Sieve elements of the normal external secondary phloem are in contact with the vertical included secondary phloem strands by means of horizontally oriented ones within the wider rays. A three‐dimensional network of sieve elements exists throughout the secondary stem tissue, interrupted by the cambial zone.