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NUMERICAL TAXONOMIC STUDIES ON SPECIES IN ALLIUM SUBGENUS RHIZIRIDEUM
Author(s) -
ELGADI A.,
ELKINGTON T. T.
Publication year - 1977
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1977.tb02195.x
Subject(s) - subgenus , allium , biology , numerical taxonomy , genus , dendrogram , botany , chemotaxonomy , taxonomy (biology) , zoology , population , demography , sociology , genetic diversity
Summary Numerical taxonomic studies have been carried out on fifteen operational taxonomic units (O.T.U.'s) belonging to Allium subgenus Rhizirideum. The data comprise measurements and observations of forty‐nine morphological and cytological characters and thirty‐eight chemical characters which are volatiles detected by gas liquid chromatography of direct vapour samples and mainly identified as sulphides. The CLASP program has been used to analyse the data. Classifications derived from hierarchical cluster analyses and principal co‐ordinates analyses are presented as dendrograms and vector plots respectively, the latter with the minimum spanning trees added. Classifications produced by analysis of the morphological and cytological characters and chemical characters are compared both with one another and with those produced by analysis of all characters. The main groups distinguished in the analyses are (a) A. cepa, A. cepa cv. Shallot, A. galanthum and A. fistulosum ; (b) O.T.U.'s belonging to A. schoenoprasum ; (c) A. senescens, A. senescens var. glaucum, A. montanum and A. albidum ; (d) A. tuberosum and A. ramosum (e) A. farreri. These groups correspond with biosystematic groupings suggested by hybridization studies. They are also compared with existing sectional classifications of the genus.