in this study the original mitotic chromosome counts are presented for 5 onobrychis species of o. sect. onobrychis in iran, 2n = 2x = 14 for o. persica, 2n = 4x = 28 for o. viciifolia, 2n = 4x = 28 for o. altissima, 2n = 2x = 14 for o. shahpurensis and 2n = 2x = 14 for o. sosnovskyi. the basic chromosome numbers of all studied taxa are consistent with the proposed base number of x = 7. in addit...

flower morphology of ten fritillaria species of subgenera theresia and fritillaria growing wild in iran is studied using seventy morphological characters. qualitative and quantitative datasets separated taxa into subgenera, sectional and groups. three enigmatic species f. caucasica, f. zagrica (endemic to zagros mountains) and f. pinardii (recently reported from zagros mountains) appeared as cl...

a phenetic analysis of the 12 taxa or operational taxonomic units (otus) belonging to the three sections; genea, neobromus, and nevskiella of the genus bromus was performed. unweighted pair-group method using arithmetic averages (upgma) and weighted pair-group method using arithmetic averages (wpgma) clustering and factoriel method analyses were used to set the taxa apart. forty-four characters...

During a study on wood inhabiting fungi in Guilan province, several specimens of the Hypoxylon and Annulohypoxylon, were examined. A total of eight taxa viz.

this research summarizes the data on benthic macro invertebrates collected from 25 points in the urmia lake wetlands during november 2008 to february 2009. the purpose of the study was to assess the effects of elevated salinity and nutrient (nitrogen and phosphorus) levels on macro invertebrate abundance and composition. a total of 32 taxa were collected, and the common taxa, including chironom...

In the original description of the index, S i is the number of taxa in the given clade and rank after the study. The meaning of “number of taxa” must be the number of valid taxa in this context. This suggests that the number of taxa can only be higher after the taxonomic revision. However, synonyms are abundant in most taxonomic groups in various proportion (May & Nee 1995; Patterson 1996). Syn...

The genomics revolution offers great promise for resolving the phylogeny of living taxa, but does it offer any benefits for reconstructing relationships among extinct (fossil) taxa? Superficially, the answer would seem to be "no," given that molecular data cannot be obtained for most fossil taxa. However, because fossil taxa often interdigitate among living taxa on the Tree of Life, molecular d...

the present study reports the chromosome number and meiotic behaviour of 14 populationsbelonging to four taxa of anchusa subgenus buglossum gusul. from iran. all populationsshowed the chromosome number 2n= 4x= 32. it is the first meiotic study for a. subg.buglossum. we discuss some habit form and evolutionary aspect in the light of cytogeneticdata. the origin of polyploidy (auto-allopolyploidy)...

in the framework of a study on the powdery mildew fungi in iran, several infected plant specimens were collected from around the country during 2001-2009. based on the results of the study erysiphe quercicola on quercus sp. and e. malvae on malva sp., golovinomyces ambrosiae on helianthus spp., golovinomyces fischeri on senecio glaucus, are the newly reported for iranian mycobiota. in addition,...

habit and pollen morphology were studied in four taxa belonging to astragalus sect. macrophyllium in iran. data obtained from pollen morphology support the phenetic grouping based on habit morphology. in addition, meiotic chromosome number and behavior were analyzed in two species of the section. the species were cytogenetically analyzed and found to be tetraploid and possess a 2n = 4x = 32 chr...