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Wiki says that the English 'agrimony' corresponds to the Russian "репешок" which is absolutely different plant.

1. Я застегнул рубашку. Я застегнул пуговицы на рубашке. - both are fine. You can also just say Я застегнул пуговицы. As for зашнуровать шнурки, this is incorrect and doesn't make sense (can you say...