جستجوی مقالات مرتبط با کلیدواژه « flora iranica » در نشریات گروه « زیست شناسی »

Achene morphology of 49 taxa of the genus Centaurea L. was studied in terms of 19 different characteristics. On the basis of the variation in these features, some sections, such as sect. Cyanus with hairy hilum, were separated. Despite various differences, C. leuzeoides and C. gilanica were categorized in the section Psephelloideae, a section with lots of character variations within its species. Also, C. albonitens has different characteristics in comparison with other taxa within section Phaeopappus, for example features such as pappus color and the ratio of pappus length to that of achene separated the species from other members of the section. The last but not the least, highly different characteristics were observed in the achene morphology of C. phlomoides as compared with other species in section Cynaroides. Differences such as short pappus and hilum length were found to separate C. phlomoides from other members of sect. Cynaroides. In conclusion, on the basis of the findings of this research, most achene morphological characteristics can be appropriately used as key features for the differentiation of sections in the genus Centaurea. An identification key based on the features of the achene, images related to the achene of the studied species were also presented.

The genus Sagina L. (Caryophyllaceae) was reviewed during the preparation of Flora of Iran (in Persian). All specimens of Sagina and close taxa were studied and identified in the Herbarium of Research Institute of Forests & Rangelands (TARI). A specimen from SW of Ramsar, W. of Javaher-deh was identified as Sagina procumbens L. which is new for Iran and the Flora Iranica region. Geographical distribution and its illustration are presented here.

Potamogeton friesii Rupr.is reported for the first time from the Flora Iranica area. This species was collected from Chaharmahal va Bakhtiari, Gilan, Isfahan and Khuzestan provinces. It is distinguished from its closest relatives, Potamogeton pusillus and P. berchtoldii, by having 5-7-veind, wide leaf and stipules which split at the top and being free from each other at upper part and also this species is reddish or brownish in fresh status. A geographical distribution map, anatomical features and an illustration of the species are given.

Artemisia sieberi Besser is distributed in vast steppes of Iran. There are different opinions about the correct name of Iranian steppic Artemisia. Some authors believe that the Iranian specimens are A. sieberi and the others A. herba-alba. Phytochemical studies of 34 populations of the species in Iran, A. herba-alba specimens of Spain and A. sieberi specimen of Palestine confirmed that the name of A. sieberi is correct.

Sesuvium verrucosum is reported for the first time from Iran and Flora Iranica area. It was collected in Kish Island and near Mahshshr in S. Iran. It differs in number of stamens, shape and size of leaves and plant color in drying state from S. sesuvioides (Fenzl) Verdc. which was introduced from Flora Iranica only from Pakistan.

Two new records of the genus Euphorbia are reported for the first time for the Flora Iranica area and the flora of Iran. These species that were collected from N & NE-Iran are E. maculata and E. consanguinea respectively.