采用石蜡制片法观察了白刺大、小孢子发育过程,结果表明:白刺的雌蕊由3心皮合生成,子房3室,其中2个室内各形成1个倒生胚珠,最后只有1个胚珠发育成1枚种子。胚珠有双珠被,厚珠心,蓼型胚囊;花药四囊型,花药壁由表皮、药室内壁、中层和绒毡层组成,药室内壁纤维质加厚,腺质绒毡层;小孢子母细胞减数分裂为同时型,小孢子四分体呈四面体形排列,花粉散发时为二细胞型。 The results showed that the pistil of Nitraria przewalskii was formed by 3 carpels and the ovary had 3 compartments, of which 2 formed an inverted ovule, and only 1 An ovule developed into a seed. Ovules are double bead, thick bead heart, Polygonum type embryo sac; anthers four capsule type, the anther wall from the epidermis, drug wall, middle and tapetum, thickened inner wall of the drug chamber, glandular tapetum; Microspore mother cells meiosis into simultaneous, microspore tetrad is arranged in a tetrahedron, pollen distribution of two-cell type.