Question

1/3 spiral phyllotaxy, called as tristichous, means

• A. 3 rows of alternate rows
• B. In one circle, there are 3 leaves
• C. The angular divergence between 2 leaves is 120${}^o$
• D. All of the above

Answer 1

The correct option is D All of the above

Tristichous phyllotaxy is the arrangement of leaves spirally in three alternate vertical rows. In this mode of arrangement, the first, fourth, seventh and tenth leaf remains in one row while the third, sixth, ninth and twelfth in the second row and second, fifth, eighth and eleventh in the third row. This angular divergence is 120. For example, Cyperus.

Thus, the correct answer is option D.