Initiation of Strobili Primordia in Pinus Strobus L.
Recent studies of initiation of strobili in Pinus have been on the 'hard" or "yellow" pines (Diploxylon). The results indicate that both male and female strobili are differentiated at the close of the growing season. However, marked differences between this group and the "soft" or "white" pines (Haploxylon) exist for many characteristics. Ferguson (1904) could find no primordia of male or female strobili in P. strobus as late as November, yet these structures always appeared the following spring. In southern New England P. strobus tends to flower later than other pines . These considerations suggested that initiation of strobili in P. strobus did not occur until spring.
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Author(s): George R. Stephens, Jr.
Publication: Tree Improvement and Genetics - Northeastern Forest Tree Improvement Conference - 1961