Colpodium

Abstract: Recent collections of the genus Colpodium from Ethiopia and South Africa made a renewed revision of the African material of this genus desirable. Apart from the two earlier recognized African species (C. chionogeiton and C. hedbergii) a third one is descr

Abstract: he botanical family of the grasses (Poaceae) comprises.10 000 species. Their reproductive mechanism, plantanatomy and genetic variability results in a high level of adaptability enabling grass species to grow in most terres-trial habitats. In the past few thousand years, humans have taken advantage of these natural resources by domesticating and breeding a small subset of the grass species. These effortshave resulted in many important crop plants, such as wheat, rice, maize and sorghum. Many species, including wheat, aregrown in different climate zones and environmental conditions,demonstrating the diversity in the gene pool of a single species.Wheat and rice each contribute ~20% of the calories ingested by the world’s population (FAOSTAT home page; http://apps.fao.org/). In total, ~60% of the world’s food production isobtained from grasses, which makes them economically by farthe most important plant family.In terms of genome organization, grasses represent a highlydiverse family. Their chromosome number varies from 2n5 4 for the two species Zingeria biebersteinianaand Colpodium versicola

Abstract: Flora Iranica provides a description of the genera and identification keys for species, however; as a result of variability of morphological traits and intermediate characters there is some ambiguities in positions of taxa in Poaceae family. Therefore, we studied some taxonomic changes in genus belong to Poaceae family. After sampling, morphological investigations, anatomical studies of leaves, micromorphological studies of abaxial and adaxial surface of leaves, lemma and gluma were performed. The results were conducted to some numerical analysis aspects On the basis of PCA (Principal component analysis). Additionally, inter-species taxonomic distances and inter-genus borders were determined. According to the results, in Flora Iranica, four species of Colpodium Trin. genus are named which are reduced to two species in this study. In other words, taxonomic positions of C. violaceum (Boiss.) Griseb. and C. versicolor (Stev.) Schmalh are preserved whereas C. parviflorum Boiss. and C. humile (M.B.) Griseb. were transferred to Catabrosella Tzvel.(Tzvel.) genus and introduced as Catabrosella parviflora (Boiss. and Buhs.) Alex. ex Mill., Comb. Nov species, and C. humilis subsp. humilis. Furthermore, C. humilis subsp. Calvertii (Boiss.) Tzvel., is reported for the first time in Iran. The populations of Catabrosella Tzvel. (Tzvel.) in high regions, with moist and humous beds forms mountain meadows. In Flora Iranica (Bor, 1970) there is no report about species belong to this genus.