What is the fine-grained topic of the following text: Familia Genero 2011 2012 Total Asteraceae Senecio 20 5 25 Plantaginaceae Plantago 11 - 11 Malvaceae Nototriche 9 1 10 Poaceae Calamagrostis 5 4 9 Asteraceae Werneria 5 4 9 Solanaceae Solanum 8 - 8 Fabaceae Astragalus 7 - 7 Asteraceae Perezia 4 2 6 Malvaceae Tarasa 4 2 6 Valerianaceae Valeriana 5 1 6 Asteraceae Baccharis 5 - 5 Iridaceae Sisyrinchium 2 3 5 Brassicaceae Lepidium 2 3 5 Cactaceae Cumulopuntia 3 2 5 Oxalidaceae Oxalis 3 2 5 Asteraceae Xenophyllum 1 3 4 Poaceae Poa 2 2 4 Caryophyllaceae Paronychia 2 2 4 Asteraceae Hypochaeris 4 - 4 Figura 1. Only return the topic.
The distribution of various plant species within certain families across the years 2011 and 2012.