Abstract: The process of seed development in Paris and P.polyphylla var. yunnanensis is similar. Fertilization proceeds on the 10th to 15th day after pollination. The process of seed maturation lasts for about 150--170 days. Most of the mature embryos stay at spherical stage or become slightly differentiaed. Endo- sperm is Helobial type. Seed-coat is derived from both integuments. In P.axialis the aril arises from the funicle and it surronds the seed at the base of ovule. The aril is spongy, light green-white-coloured. In P. polyphylla var. yunnanensis, the aril is absent, while the seed is enclosed by a fleshy, bright red-coloured seed coat.

Key words: Paris