On my homestead, I have three dinosaur plants. The first is Horsetail. (That's Horsetail, not Old Horsetail.)
Today's horsetails are fairly small, 2-3 feet high, but they were tree sized a few hundred million years ago. I found mine growing along a stream bank in Gulf Hammock, Florida. I liberated a few and gave them a new home at my place and they have thrived. Being primitive, spore producing plants, they really appreciate the shady, damp area that I put them in.
The horsetail in the photo below is sporting it's spore producing structure at the top.
My other time travelers are an assortment of ferns that also prefer the shady, moist areas. They too are mere shadows of their ancestors, the tree ferns, who cast shadows on the backs of dinosaurs.
The third bit of dinosaur fodder growing at the FC homestead is the primitive Cycad family. I have two (3, if you get real plant nerdy) species of these growing in the woods and around the house. The native cycad pictured below is the Coontie. These stay low to the ground with only the fronds exposed. One type of Coontie was here when I got here, but I also added a different variety from my grandfathers house.
I have planted Sago Palms (not really a palm) as accent plants near the porch. These non-native cycads have large spiky fronds that resemble a palm. They give a very tropical effect wherever they grow.
These plants are survivors from the earliest forests on the planet.All of these plants are still toting dino defense systems such as underground stems to protect against grazers, spikes on sago fronds to discourage nibblers, and even a few toxins.
These days, they are great plants to have around the house, because almost nothing eats them. The big dinosaurs are long gone.
Like these botanical holdovers, the current crop of dinosaurs has downsized also and they seem to prefer feeding on millet, thistle, and sunflower seeds...