Le genre Poa (en fran9ais: paturin, en allemand: Rispengras) Dans la presente etude, nous avons adopte la classification qui comprend plus de 200 especes dans le Monde, est un des de Edmondson (1980), non parce qu'elle est la plus recente, mieux representes parmi les Graminees des regions extratro mais parce qu'elle nous para'it la plus naturelle. Les especes, et sous-especes interessant la flore suisse y sont reparties en picales. La proportion des Poa, par rapport aux autres Gra minees, atteint 15% aux latitudes elevees et dans les hautes deux genres: Bellardiochloa et Poa et le genre Poa est divise montagnes (Hartley, 1961). D'apres cet auteur il y a une en 9 sections, et cela de la maniere suivante: correlation positive entre le nombre relatif d'especes de Poa Bellardiochloa violacea Poa violacea dans une flore et les basses temperatures estivales. Hartley (= Poa Sect. Pseudofestuca) suppose que ce genre a pris naissance dans les montagnes et Poa Sect. Ochlopoa Poa annua les plateaux d' Asie centrale et qu'il a derriere lui une longue Poa supina histoire evolutive. Poa trivialis Poa Sect. Coenopoa En Europe, il y a 45 especes de Poa (Edmondson, 1980) dont Poa trivialis subsp. sylvicola une vingtaine se rencontre en Suisse. 11 est difficile de donner Poa Sect. Poa Poa pratensis un chiffre plus precis, car les auteurs recents ne sont pas Poa angustifolia d'accord sur le rang qu'il convient d'attribuer a certains Poa Sect.

Activate is a new Key Stage 3 Science course for the 2014 curriculum, designed to support every student on their journey through Key Stage 3 to Key Stage 4 success. This student book will spark students' curiosity in science, whilst gradually building the maths, literacy and working scientifically skills vital for success in the new GCSEs.

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Study & Master Agricultural Sciences Grade 10 has been especially developed by an experienced author team for the Curriculum and Assessment Policy Statement (CAPS). This new and easy-to-use course helps learners to master essential content and skills in Agricultural Sciences. The comprehensive Learner's Book includes: * an expanded contents page indicating the CAPS coverage required for each topic * activities throughout that help develop learners' knowledge and skills * revision tasks and review at the end of each module that provides for consolidation of learning * case studies that link science to real-life situations and present balanced views on sensitive issues * 'information' boxes providing interesting additional information and 'Note' boxes that bring important information to the learner's attention * Glossary boxes to explain unfamiliar and difficult terms