M Assadi, F. Ghahremaninejad, T. Nejadsattari, I. Mehregan, K. Poursakhi,
Volume 14, Issue 3 (10-2014)
Abstract
Genus Cerastium belongs to the subfamily Alsinoideae. This genus is represented with about 30 species in two subgenera (subgenus Dichodon and subgenus Cerastium) and three sections (sect. Strephodon, sect. Orthodon and sect. Schizodon) in flora Iranica area, of which 19 species were reported from Iran. The materials in the TARI herbarium were studied. The vegetative and reproductive characteristics of specimens were checked by stereomicroscope. In family Caryophyllaceae, the seeds bear numerous characters which can be used for taxonomic purposes. The ornamentation features of the seed surface and its relief are different from one species to another. The seeds were carefully taken from mature and dehiscent capsules. Pollen grains obtained from flowers bearing mature anthers. In this paper, Cerastium pentandrum (Caryophyllaceae) is reported as a new record from northwest Iran and Iranian plateau. It belongs to the subg. Cerastium sect. Orthodon. In this section teeth of the capsule are elongated, straight or reflexed, with flat or recurved margins. Morphological characteristics of the new record are provided. This taxon is compared with its closest relative C. balearicum. The ultrastructure of seed and pollen is examined by SEM.
M Ranjbar,
Volume 15, Issue 2 (2-2015)
Abstract
In this research, plant morphology and pollen morphology of 14 populations of 3 species belonging to two sections Plethiosphace and Hemisphace of Salvia genus in Iran were studied. In morphological study 25 quantitative and qualitative characters were investigated and results of this study clearly separated species into two groups. The pollen grains from the herbarium specimens were prepared by acetolysis method and then 4 quantitative characters were examined by light microscopy. Data analysis was carried out by principal component analysis method. Results of the study showed that although the pollen grains in the section are comparatively homogenous and all of them are 6-colpate with reticulate ornamentation, but show a considerable variation in studied quantitative characters. However among the studied characters, equatorial and polar diameters of pollen grains are the most significant characters and based of these characters the members of these sections can be divided into two groups based on these characters that confirmed the results of morphology.
