Abstract

Both seeds of Sedum formosanum and Sedum morrisonense are oblong in shape. The seed size of S. morrisonense is 1.5-2 times of that of S. formosanum and the seed weight of S. morrisonense is four times of that of S. formosanum. On the outer surfaces of these ywo kinds of seeds, there are thick cuticular layers. The surface view of seed coats showed that the epidermal cells were all tuberculate but their shapes and arrangements were different between species.The inner spaces of these seeds are almost filled by the embryos. Between the radicle and seed coat there is a layer of endosperm cells. These cells contain predominantly lipid as nutrient reserve. In the embryo the insoluble reserves are lipid and protein. The ratio of areas of oil bodies and areas of protein bodies in the cotyledonous cells of S. morrisonense (3.57) is higher than that of S. formosanum (1.87).

中文摘要

石板菜與玉山佛甲草的種子均為長橢圓形，玉山佛甲草種子的大小為石板菜種子的1.5至2倍，而玉山佛甲草種子的重量則為石板菜種子的4倍。這兩種種子的外表均有厚的角皮層。而其種皮細胞亦各具一個突起，然而兩種種子種皮細胞的形狀與排列方式稍有不同。這兩種種子的內部空間幾乎均為胚胎所佔滿，而在種皮與胚根之間具一層胚乳細胞，這些細胞主要儲存物質為油脂。胚胎內的不可溶性儲存物質則為脂質與蛋白質，其中玉山佛甲草子葉細胞內的油脂體佔其細胞切面面積的比率較石板菜為高。

Keyword: Seeds, Comparative anatomy, Insoluble reserves, Sedum formosanum, Sedum morrisonense