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Analyses of cpDNA matK sequence data place Tillaea (Crassulaceae) within Crassula

Show simple item record Mort M.E. en Randle C.P. en Burgoyne P. en Smith G. en Jaarsveld E. en Hopper S.D. en 2012-11-01T16:31:23Z 2012-11-01T16:31:23Z 2009 en
dc.identifier.citation Plant Systematics and Evolution en
dc.identifier.citation 283 en
dc.identifier.citation 3 en
dc.identifier.issn 3782697 en
dc.identifier.other 10.1007/s00606-009-0227-z en
dc.description.abstract Analysis of cpDNA matK sequences for a total of 43 members of the succulent plant family Crassulaceae, including 24 taxa of Crassula, recovered a well-supported clade comprising Crassula species that is sister to the remainder of the family. The resulting topologies do not support the monophyly of the currently recognized subgenera of Crassula, as one member of subgenus Disporocarpa (C. crenulata) is placed as sister to an otherwise monophyletic subgenus Crassula. The major synapomorphy that has been used to recognize the latter subgenus is a base chromosome number of x = 7 versus a base of x = 8 in the other subgenus. We cannot assess the utility of this feature for defining subgenus Crassula because a chromosome count of C. crenulata has yet to be published. The five accessions of the recently resurrected segregate genus Tillaea (of 24 total Crassula species) included here were placed in four separate, well-supported lineages, one of which is greatly removed from the other four accessions. This suggests that this genus is not valid and should not be recognized. An initial examination of the evolution of habit indicates that a perennial habit is ancestral and that the annual habit is a feature that has been derived at least twice in the genus. © Springer-Verlag 2009. en
dc.language.iso en en
dc.subject Crassula; Crassulaceae; matK; PRAP; South Africa; Tillaea Crassula; Crassula crenulata; Crassulaceae; Tillaea en
dc.title Analyses of cpDNA matK sequence data place Tillaea (Crassulaceae) within Crassula en
dc.type Article en

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