横生胚珠(hemianatropous ovule)：胚珠的一侧生长较快，胚珠在珠柄上扭转约90°，珠孔、珠心和合点的连接线与珠柄几乎成直角，如锦葵、毛茛等的胚珠。
（3）横生胚珠（amphitropous ovule）：胚珠的一侧生长较快，使胚珠在珠柄上形成90°的扭曲，使珠孔与珠柄间形成直角，珠孔偏向一侧。
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扁桃果实由单心皮上位子房发育而成，边缘胎座，横生胚珠。
The almond fruit was developed from solitary carpel in the superior ovary which there were the border placenta and amphitropous ovule.
子房具胚珠20—23枚，胚珠横生，珠被二层，薄珠心，孢原细胞直接起大孢子母细胞作用。
The ovary contains 20-23 ovules. The ovules are hemitropous, with 2 integuments, tenuinucellate and the archesporial cell functions directly as the mega-spore mother cell.
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