毛冠菊属的花粉形态和结构及其系统学意义

对国产菊科特有属的花粉形态和结构进行了光学显微镜、扫描电镜和透射电镜的观察和研究。该属的花粉可以分为圆球形、扁球形和长球形三种类型。种之间的花粉差异主要表现在大小、形状和外壁纺饰的细微变化等方面。与紫菀族、竿里光旋和旋覆共族三个族的代表种的花粉特征进行对比分析，并结合其它生物演化证据，可得取以下结论：（１）支持ａｎｄ－Ｍａｚｚｅｔｔｉ的分类意见，毽炙属应归于紫族中；（２）毛冠菊属的花粉可划分为圆球

POLLEN MORPHOLOGY AND DETAILED STRUCTURE OF THE GENUS NANNOGLOTTIS AND ITS SYSTEMATIC IMPLICATIONS

This study presents a detailed survey and discussion on the pollen morphology and structure of Nannoglottis with light microscopy(LM), SEM, and TEM. Measurements of the polar axis and equatorial diameter, exine thickness, spine length, and spine number at each lobe are made. Differences were observed both between representatives of different tribes and between species of the same genus. The principal differences in pollen among the various species were in size, shape and subtle variations of the surface ornamentation. Three kinds of pollen types can be recognized in the whole genus, namely, spheroidal type, prolate type and oblate type. Combined with both palynological and biosystematic evidences, the data support Hand Mazzetti's taxonomic treatment that put Nannoglottis in the tribe Astereae, rather than under the tribes Senecioneae or Inuleae.