Pollen morphology in the genus Saxifraga and its taxonomic significance

Ferguson, I. K.; Webb, David

doi:10.1111/j.1095-8339.1970.tb02308.x

Cited by 38 publications

(36 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pollen exine structures were rather uniform, having a reticulate tectum (Kaplan, ). The species transferred in this study from genus Micranthes to Saxifraga ( S. korshinskyi , S. mertensiana and S. sieversiana ) have striate exine structures that otherwise were observed only in Saxifraga (Ferguson & Webb, ).…”

Section: Resultsmentioning

confidence: 88%

Molecular phylogenetics, character evolution and systematics of the genusMicranthes(Saxifragaceae)

2015

View full text Add to dashboard Cite

With c. 85 species, the genus Micranthes is among the larger genera of the Saxifragaceae. It is only distantly related to the morphologically similar genus Saxifraga, in which it has frequently been included as Saxifraga section Micranthes. To study the molecular evolution of Micranthes, we analysed nuclear ribosomal (internal transcribed spacer, ITS) and plastid (trnL–trnF) DNA sequences in a comprehensive set of taxa comprising c. 75% of the species. The molecular phylogenetic tree from the combined dataset revealed eight well‐supported clades of Micranthes. These clades agree in part with previously acknowledged subsections or series of Saxifraga section Micranthes. As these eight groups can also be delineated morphologically, we suggest that they should be recognized as sections of Micranthes. New relationships were also detected for some species and species groups, e.g. section Davuricae sister to sections Intermediae and Merkianae, and M. micranthidifolia as a member of section Micranthes. Species proposed to be excluded from the genus Micranthes for morphological reasons were resolved in the molecular tree in Saxifraga. Many morphological characters surveyed were homoplasious to varying extents. Micromorphological characters support comparatively well the clades in the phylogenetic tree. An updated nomenclature and a taxonomic conspectus of sections and species of Micranthes are provided. © 2015 The Linnean Society of London, Botanical Journal of the Linnean Society, 2015, 178, 47–66.

show abstract

Section: Resultsmentioning

confidence: 88%

Molecular phylogenetics, character evolution and systematics of the genusMicranthes(Saxifragaceae)

2015

View full text Add to dashboard Cite

show abstract

“…Aizoonia clade (n ϭ 14). A number of morphological and biosystematic characteristics also corroborate the sister relationship between S. mutata and S. aizoides, for example the dark green, rather than glaucous leaves, the yellow flowers (Webb and Gornall, 1989), the embryo development, the seed surface structure (Kaplan, 1981), the pollen exine structure (Ferguson and Webb, 1970), and the observation that, despite widespread hybridization among other species of sect. Ligulatae, the only convincing hybrid reported for S. mutata is with S. aizoides (S. ϫ hausmanii; Kuepfer and Rais, 1983;Holderegger, 1998).…”

Section: Phylogenetic Relationships Morphology and Biogeographymentioning

confidence: 75%

Phylogenetic Relationships of the Silver Saxifrages (Saxifraga, Sect. Ligulatae Haworth): Implications for the Evolution of Substrate Specificity, Life Histories, and Biogeography

Conti

Soltis

Hardig

et al. 1999

Molecular Phylogenetics and Evolution

View full text Add to dashboard Cite

“…In contrast, other changes in the columellar layer sometimes follow general tends of specialization, for example from columellar to granular structure in the genus Indigofera (Strachan & Ferguson, in press), and in Vigna Markchal, Mascherpa & Stainier, 1978;Horvat & Stainier, 1980). The occurrence of tectal columellae in pollen walls is quite well-known (Ferguson & Webb, 1970;Hideux & Ferguson, 1977;Cerceau-Larrival & Roland-Heydacker, 1976;Nabli, 1975Nabli, , 1976. The evolutionary significance of these seems to vary.…”

Section: Mention a Number Of Examples Inmentioning

confidence: 99%

Pollen morphology in relation to pollinators in Papilionoideae (Leguminosae)

Ferguson¹,

Skvarla²

1982

Botanical Journal of the Linnean Society

Self Cite

View full text Add to dashboard Cite

The surface sculpturing of the pollen of some species of the taxonomically widely separated genera Harpalyce (tribe Brongniartieae), Camoensia (tribe Sophoreae), Millettia (tribe Tephrosieae), and of the monotypic Dahlstedtia (tribe Tephrosieae) which have large red or white flowers adapted for pollination by birds or bats, is coarsely rugulate or verrucate. Related taxa with small insect pollinated flowers have pollen with simple reticulate or perforate surface sculpturing. The exine stratification of Alexa and Castanospermum (tribe Sophoreae), genera with large red bird‐flowers, is complex with a layer of tectal columellae and differs from that of other genera in the tribe Sophoreae which have a normal pollen wall structure. These modifications of pollen structure and sculpture appear to be the result of convergent evolution and a secondary adaptation to pollination. The taxonomic and functional significance of the observations are briefly discussed.

show abstract

Pollen morphology in the genus Saxifraga and its taxonomic significance

Cited by 38 publications

References 2 publications

Molecular phylogenetics, character evolution and systematics of the genusMicranthes(Saxifragaceae)

Molecular phylogenetics, character evolution and systematics of the genusMicranthes(Saxifragaceae)

Phylogenetic Relationships of the Silver Saxifrages (Saxifraga, Sect. Ligulatae Haworth): Implications for the Evolution of Substrate Specificity, Life Histories, and Biogeography

Pollen morphology in relation to pollinators in Papilionoideae (Leguminosae)

Contact Info

Product

Resources

About