I went to the botanical garden in the "Jardin des Plantes" in Paris. In a glasshouse with the name "Serre de l'histoire des plantes" on the natural history of plants (exhibiting some ancient members of plants like ferns, Cyatheales, etc.), I found the tree-like plant on the picture attached below (the one with grass-like looking "leaves"; unfortunately, I don't have a better picture because it was a bit hidden). There was no sign labelling this particular plant, or at least I was not able to spot any. Does anyone know what type of plant this is? It was rather small, roughly 2 meters in height.