Mishnah for Chullin 120:34
מלמד שיצאו דשאים ועמדו על פתח קרקע עד שבא אדם הראשון ובקש עליהם רחמים וירדו גשמים וצמחו
is a specific creature that has two backs and two spinal columns.
Mishnah Kilayim
They may not graft from one tree to another, or from one vegetable to another, or from a tree to a vegetable, or from a vegetable to a tree. Rabbi Judah permits it from a vegetable to a tree.
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