AUSTROCEDRUS CHILENSIS (DON,D.) PIC-SER ET BIZZ (CUPRESSACEAE) FROM CHILE AND ARGENTINA - MONOECIOUS OR DIOECIOUS

Sex expression was investigated in 19 populations of Austrocedrus chil ensis, a species previously described as monoecious, in Chile and Arge ntina and in Chilean herbarium material. The species was found to be d ioecious throughout its range. Strong female biased sex ratios were fo und in three populations, but ratios did not deviate from 1:1 in other populations. Sex expression was constant over a three year period, as assessed in one site. Mean DBH was similar for males and females in t hree populations.