One of the great mysteries of evolutionary biology is how, 150 or more million years ago, modern-day angiosperms (flowering plants) diverged from their closest relatives, the gymnosperms (seed-bearing ...

IN an interesting article entitled "The present status of Plant Embryology" Dr. Donald A. Johansen 1 makes the following observation (p. 101) regarding the origin of polyembryony: "To cite another ...

Figure 2: Convergence in form of angiosperm female gametophytes. Taken together, our data clearly demonstrate three essential facts about the reproductive process in N. polysepalum: (1) the mature ...

The origin of flowering plants, or angiosperms, stands as one of evolutionary biology's great enigmas. Scientists know that they diverged from the seed-bearing plants, or gymnosperms, at least 150 ...

New research suggests the graceful water lily may be the missing link in the evolution of flowering plants. A developmental study of the water lily, Nuphar polysepalum, by University of Colorado ...

Biologists have discovered that the water lily may be a critical 'missing link' in the evolution of flowering plants. One of the great mysteries of evolutionary biology is how, 150 or more million ...