Chalaza (pl.chalaxae or chalazas) The region of an angiosperm ovule where the nucellus and integuments merge.合点:被子植物胚珠上的一个区域,在合点处珠心和珠被愈合。
When ovule orientation is orthotropous the chalaza corresponds to the point where the funicle is attached but in anatrop当胚珠的方向是直生胚珠时,合点和珠柄连成一条直线,当胚珠是倒生胚珠或弯生胚珠时,合点和珠柄之间有一定的距离。