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Revision of the three Boraginaceae genera Echiochilon, Ogastemma and Sericostoma
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Systematic Botany.
1999 (English)In: Botanical journal of the Linnean Society, ISSN 0024-4074, E-ISSN 1095-8339, Vol. 130, no 3, 185-259 p.Article in journal (Refereed) Published
Abstract [en]

The Afro-Asiatic genus Echiochilon Desf. (Boraginaceae) is revised and 14 species are recognized. The two monotypic genera Ogastemma Brummitt and Sericostoma Stocks ex Wight (Boraginaceae), earlier suggested to be close relatives of Echiochilon, are also revised to evaluate their distinction from the genus Echiochilon. There is no support for including any of the two monotypic genera in Echiochilon. Morphological aspects of the three genera are discussed. Three new species are described: E. baricutn Lonn sp. nov. and E. cyananthum Lönn sp. nov. from northern Somalia, and E. callianthum Lonn sp. nov. from Arabia. A key, descriptions, pictures and distribution maps are provided for all species of Echiochilon, and descriptions and distribution maps are provided also for Ogastemma and Sericostoma. Several lectotypes are selected and several names arc placed in synonymy.

Place, publisher, year, edition, pages
1999. Vol. 130, no 3, 185-259 p.
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-89725DOI: 10.1111/j.1095-8339.1999.tb00521.xOAI: oai:DiVA.org:uu-89725DiVA: diva2:161439
Available from: 2002-03-20 Created: 2002-03-20 Last updated: 2012-01-16Bibliographically approved
In thesis
1. Systematics of Echiochilon and Ogastemma (Boraginaceae), and the Phylogeny of Boraginoideae
Open this publication in new window or tab >>Systematics of Echiochilon and Ogastemma (Boraginaceae), and the Phylogeny of Boraginoideae
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Echiochilon, Ogastemma and Sericostoma are revised resulting in the recognition of 15 species of Echiochilon and one Ogastemma species. Several species are placed in synonymy and three new species are described, E. baricum, E. callianthum and E. cyananthum. The single species of Sericostoma is shown to be nested within Echiochilon.

The plastid atpB gene was sequenced for Echiochilon and Ogastemma from the Old World and Antiphytum from the New World, plus for a selection of 33 other Boraginaceae taxa. They were analysed together with selected outgroup taxa to give a framework of the tribes of Boraginoideae. The analysis gave support for establishing the new tribe Echiochileae for Antiphytum, Echiochilon and Ogastemma, and for merging the traditionally accepted tribe Eritrichieae with Cynoglosseae. The ITS region was sequenced for all but one species of Echiochilon and for representatives of Antiphytum and Ogastemma. Phylogenetic analysis of Echiochilon revealed that the strongly zygomorphic-flowered species form a paraphyletic group. The morphological data gave results fairly congruent with the ITS phylogeny.

Biogeographic interpretations of the ITS and atpB phylogenies indicated a trans-Atlantic dispersal of Antiphytum as the most plausible explanation to the Old/New World disjunction. Analyses using DIVA (Dispersal Vicariance Analysis) of the distributions of the Echiochilon species indicated an ancestor to Echiochilon with a wide distribution over northern Africa and Arabia to India.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2002. 34 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 693
Keyword
Organismic biology, Antiphytum, Echiochilon, Ogastemma, Boraginaceae, Echiochileae trib. nov., phylogeny, ITS, floral morphology, atpB, tribes, biogeography, Africa, America, Organismbiologi
National Category
Microbiology
Research subject
Systematic Botany
Identifiers
urn:nbn:se:uu:diva-1863 (URN)91-554-5257-4 (ISBN)
Public defence
2002-04-12, the Lindahl Hall, Norbyvägen 18 A, Uppsala, 10:00
Opponent
Available from: 2002-03-20 Created: 2002-03-20 Last updated: 2012-01-16Bibliographically approved

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