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Figure 19

Four Keteleéria davidiana seeds. A - adaxial view of integument covering entire surface, with partial wing attached. B - abaxial view of integument flaps extending around seed margins, and partial wing. C - abaxial view of integument with flaps extending around seed margins, wing almost completely broken off. D - adaxial view integument covering entire surface (wing broken off). C and D probably would be "pure seed" according to PSD 51.

Figure 19

Figure 19. Four Keteleéria davidiana seeds. A - adaxial view of integument covering entire surface, with partial wing attached. B - abaxial view of integument flaps extending around seed margins, and partial wing. C - abaxial view of integument with flaps extending around seed margins, wing almost completely broken off. D - adaxial view integument covering entire surface (wing broken off). C and D probably would be "pure seed" according to PSD 51.