scholarly journals Floral development and molecular phylogeny support the generic status of Tasmannia (Winteraceae)

2004 ◽  
Vol 91 (3) ◽  
pp. 321-331 ◽  
Author(s):  
Andrew N. Doust ◽  
Andrew N. Drinnan
Keyword(s):  
Molecular Phylogeny ◽  
Floral Development ◽  
Generic Status

Floral development and anatomy of Pentadiplandra (Pentadiplandraceae): a key genus in the identification of floral morphological trends in the core Brassicales

2002 ◽  
Vol 80 (5) ◽  
pp. 443-459 ◽  
Author(s):  
Louis P Ronse De Craene
Keyword(s):  
Molecular Phylogeny ◽  
Floral Development ◽  
Evolutionary Trends ◽  
Close Link ◽  
The Core ◽  
Anatomical Data ◽  
Young Leaves ◽  
Petal Growth ◽  
Basal Position ◽  
Axile Placentation

The development and anatomy of leaves and flowers have been investigated in the monotypic species Pentadiplandra brazzeana to discuss its position relative to the core Brassicales and to clarify floral evolutionary trends within the order. Young leaves are flanked by two large stipules that shrivel at anthesis. Young flowers develop as elliptical primordia on a flattened raceme. Sepal initiation is sequential, starting with the lateral sepals and ending with three median sepals. The petals and diplostemonous androecium arise as regular whorls. Five antesepalous carpels develop into a saccate gynoecium with axile placentation. Petals develop a cushion-like basal appendage covering the extrastaminal nectary. Several ontogenetic and anatomical data of the flower support the basal position of Pentadiplandra in the evolution of the core Brassicales and for the derivation of the order from pentamerous diplostemonous ancestors. A derivation of the tetramerous Capparaceae and Brassicaceae as well as hexamerous Tovariaceae is discussed. A number of synapomorphies are identified: sequential sepal initiation with laterals preceding median sepals, retarded petal growth, a (andro)gynophore, the extrastaminal nectary, and stipulate leaves. The peculiar androecium of the Brassicaceae is caused by the strong median compression of the flower, leading to the loss and displacement of median stamens. The derivation of a parietal placenta from an axile placenta is supported. Evidence supports a close link with either Tovariaceae or Capparaceae, concomitant with macromolecular results.Key words: core Brassicales, Capparaceae, Pentadiplandra brazzeana, Tovariaceae, molecular phylogeny, floral development, anatomy, diplostemony, placentation.

scholarly journals Re-evaluation of the generic status ofAthenaeaandAureliana(Withaniinae, Solanaceae) based on molecular phylogeny and morphology of the calyx

2015 ◽  
Vol 177 (3) ◽  
pp. 322-334 ◽  
Author(s):  
Priscilla M. Zamberlan ◽  
Izabella M. C. Rodrigues ◽  
Geraldo Mäder ◽  
Luana Castro ◽  
João R. Stehmann ◽  
...  
Keyword(s):  
Molecular Phylogeny ◽  
Generic Status

Molecular phylogeny and taxonomic evaluation of the genus Asaccus Dixon and Anderson, 1973 (Reptilia: Phyllodactylidae) in Iran

2020 ◽  
pp. 207-214
Author(s):  
Akbar Fattahi
Keyword(s):  
Molecular Phylogeny ◽  
Nuclear Gene ◽  
Genetic Distances ◽  
Genetic Lineage ◽  
New Taxon ◽  
Zagros Mountains ◽  
Relict Species ◽  
Taxonomical Revision ◽  
Two Populations ◽  
Taxonomic Evaluation

The Iranian species of the phyllodactylid geckos of the genus Asaccus are found only in the valleys of the Zagros Mountains, a region which represents an important area of endemism in western Iran. Recently, many relict species have been described from the central and southern parts of the Zagros Mountains, which were previously known as A. elisae. The recent descriptions of species within this complex suggest that diversity within the genus may be higher than expected and that its taxonomy and systematics should be revised. In the present study, phylogenetic relationships within the genus Asaccus were evaluated using two mitochondrial and one nuclear gene. Genetically, the genus shows high levels of variability. The molecular phylogeny of the genus suggests the presence of three main clades along the Zagros Mountains with the southern population (from the Hormozgan province) and one clade (A. sp8 and A. sp9) being sister taxon to A. montanus from UAE. The remaining samples are separated into two reciprocally monophyletic groups: the northern (Kurdistan, Kermanshah and Ilam provinces) and the central (Lorestan, Khuzestan, Kohgilouye-Bouyer Ahmad and Fars provinces) Zagros groups. The results of the present study suggest that populations attributed to A. elisae in Iran correspond to distinct lineages with high genetic distances. In brief, our results suggest that the genus needs a major taxonomical revision The Arabian origin of the genus has not been confirmed, because two populations from Zagros were located within the A. montanus, A. gallagheri and A. platyrhynchus clade. Further morphological analyses are needed to systematically define each genetic lineage as a new taxon.

Morphology, nomenclature and distribution of Bassia monticola (Chenopodiaceae-Amaranthaceae), a poorly known species from Western Asia

2020 ◽  
pp. 13-17
Author(s):  
A. P. Sukhorukov ◽  
M. A. Kushunina
Keyword(s):  
Molecular Phylogeny ◽  
Morphological Characters ◽  
Mountainous Regions ◽  
Western Asia

Kochia monticola was previously considered as a synonym for the widely distributed Irano-Turanian Panderia pilosa. After the merger of Kochia and Panderia with Bassia based on molecular phylogeny, K. monticola remained a synonym of Bassia pilosa. We claim that Bassia monticola, a name proposed by Kuntze (1891) for K. monticola, should be separated from B. pilosa based on morphological characters and localised distribution in mountainous regions of Iran, Iraq, Syria, and Lebanon at altitudes 1800–2600 m a. s. l.

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