Search for dissertations about: "växtsystematik"
Showing result 1 - 5 of 16 swedish dissertations containing the word växtsystematik.
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1. Systematics and biogeography of the South African Metalasia clade (Asteraceae-Gnaphalieae)
Abstract : The Metalasia clade (Asteraceae–Gnaphalieae) consisting of the genera Metalasia, Atrichantha, Calotesta, Dolichothrix, Hydroidea, Lachnospermum, Phaenocoma, and Planea is endemic to South Africa with a main distribution within the Cape Floristic Region (CFR), a region known for its remarkable botanical diversity.The monophyly of the Metalasia clade, the relationships of its genera, and the circumscription of these as well as their position within the tribe Gnaphalieae is investigated using molecular data. READ MORE
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2. Pollen and pollination in Ephedra (Gnetales)
Abstract : Ephedra (Gnetales) is a gymnosperm genus with a long evolutionary history; the first dispersed pollen grains with affinity to the group are known already from the Permian. This thesis focuses on the evolutionary history of the group and different aspects of its pollination mechanisms. READ MORE
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3. Pollination in Ephedra (Gnetales)
Abstract : Pollination, i.e., the transport of male gametophytes to female gametophytes, can occur with biotic or abiotic vectors and is necessary for fertilization and completion of the lifecycle in all seed plants. READ MORE
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4. Evolutionary relationships in Thunbergioideae and other early branching lineages of Acanthaceae
Abstract : Acanthaceae as circumscribed today consists of the three subfamilies Acanthoideae (Acanthaceae sensu stricto), Thunbergioideae and Nelsoniodieae, plus the genus Avicennia. Due to the morphological dissimilarities of Thunbergioideae and Nelsonioideae, the delimitation of the family has been controversial. READ MORE
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5. Phylogenetic studies in the Inuleae s. lat. (Asteraceae)
Abstract : This thesis concerns phylogenetic problems in the tribe Inuleae s. lat. (Asteraceae). The genus Perralderia is revised. READ MORE