Thesis (DPhil)--Stellenbosch University, 2002. / ENGLISH ABSTRACT: A biosytematic revision of the seven minor genera of the Hyacinthaceae, including
twenty-two species, was undertaken. Muller-Doblies & Muller-Doblies (1997)
considered these seven genera (Amphisiphon Barker, Androsiphon Schltr., Daubenya
Lindl., Massonia Thunb. ex Houtt., Neobakeria SChItL, Polyxena Kunth and Whiteheadia
Harv.) together with the genus Eucomis L'Herit. to form the subtribe Massoniinae of the
tribe Massonieae. Previous revisions of the group were based only on morphological
characters (Jessop 1976; Muller-Doblies & Muller-Doblies 1997).
The subtribe Massoniinae is characterised by the large variety of floral forms exhibited
by the different species in the group. In the past this has led to the establishment of many
monotypic genera for species thought to have unique floral structures. Morphological,
leaf anatomical, palynological, geographical and molecular data were studied in order to
delimit the taxa and determine the phylogenetic relationships within the group. This
showed that most of the unique floral structures are probably only adaptations to
pollination strategies and all except one of the monotypic genera are now placed in the
genus Daubenya. In the genus Massonia there is a great deal of variation in leaf
morphology and this resulted in the establishment of many invalid species, now mostly
reduced to synonymy.
A new species was described, several name changes made and several species were
reduced to synonymy. / AFRIKAANSE OPSOMMING: 'n Biosistematiese hersiening van die sewe kleiner genera van die Hyacinthaceae,
insluitende twee-en-twintig spesies, is onderneem. Muller-Doblies & Muller-Doblies
(1997) sluit hierdie sewe genera (Amphisphon Barker, Androsiphon Schltr., Daubenya
Lindl., Massonia Thunb. ex Houtt., Neobakeria Schltr., Polyxena Kunth and Whiteheadia
Harv.) saam met die genus Eucomis L'Herit. in die subtribus Massoniinae van die tribus
Massonieae in. Vorige hersienings van die groep was meestal net op morfologiese
kenmerke gebaseer (Jessop 1976; Muller-Doblies & Muller-Doblies 1997).
Die subtribus Massoniinae word gekenmerk deur die groot variasie in blomstrukture wat
by die verskillende spesies in die groep voorkom. In die verlede het dit gelei tot die
beskrywing van verskeie monotipiese genera gegrond op wat geblyk het, unieke
blomstrukture te wees. Morfologiese, blaar anatomiese, palinologiese, geografiese en
molekulere data is bestudeer om die verskillende taksons af te baken en terselfdertyd die
filogenetiese verwantskappe binne die groep te bepaal. Dit het aangetoon dat die unieke
blomkenmerke eerder aanpassings aan bestuiwings-strategiee is en dat al hierdie
monotipiese genera, behalwe een tot die genus Daubenya behoort. In die genus
Massonia is daar baie variasie in blaarmorfologie en dit het veroorsaak dat 'n groot aantal
spesies beskryf is, waarvan baie nou as sinonieme beskou word.
Een nuwe spesies is beskryf, verskeie naarnsveranderinge is gemaak, en 'n aantal van die
spesies is tot sinonieme verander.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/52618 |
| Date | 03 1900 |
| Creators | Van der Merwe, Alison M. (Alison Mary) |
| Contributors | Marais, E. M., Bellstedt, D. U., Stellenbosch University. Faculty of Sciences. Dept. of Botany and Zoology. |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | English |
| Type | Thesis |
| Format | iv, 107 p. : ill. (some col.) |
| Rights | Stellenbosch University |
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