Cytotaxonomic analysis of South American species of Vernonia (Vernonieae: Asteraceae)

Chromosome numbers in 48 populations belonging to 31 species of Vernonia from South America have been determined. First chromosome counts are reported for V. propinqua var. canescens (2n = 20), V. sceptrum (2n = 80), V. rufogrisea (2n = 32), V. heringeri (2n = 32), V. hovaefolia (2n = 64), V. hystri...

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Bibliographic Details
Published in:Botanical journal of the Linnean Society 2002-08, Vol.139 (4), p.401-408
Main Author: DEMATTEIS, MASSIMILIANO
Format: Article
Language:English
Subjects:
aneuploidy
chromosome numbers
classification
polyploidy
Vernonia
Vernonia heringeri
Vernonia hovaefolia
Vernonia hystricosa
Vernonia obtusata
Vernonia propinqua
Vernonia pseudoincana
Vernonia rubricaulis
Vernonia rufogrisea
Vernonia rugulosa
Vernonia sceptrum
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Summary:Chromosome numbers in 48 populations belonging to 31 species of Vernonia from South America have been determined. First chromosome counts are reported for V. propinqua var. canescens (2n = 20), V. sceptrum (2n = 80), V. rufogrisea (2n = 32), V. heringeri (2n = 32), V. hovaefolia (2n = 64), V. hystricosa (2n = 128), V. obtusata (2n = 64), V. pseudoincana (2n = 32), V. rubricaulis var.◊australis (2n = 64) and V. rugulosa (2n = 30). The basic chromosome numbers x = 10, 14, 15, 16 and 17 were confirmed for New World species of Vernonia. Together with previous records, these numbers suggest that the evolution of Vernonieae has occurred through a combination of polyploidy and aneuploidy. Taxonomic implications of certain counts are also discussed. © 2002 The Linnean Society of London, Botanical Journal of the Linnean Society, 2002, 139, 401–408.
ISSN:0024-4074
1095-8339
DOI:10.1046/j.1095-8339.2002.00074.x