中国昆仑山地区棱子芹属植物苞片形态及其分类学意义

Bracts and bracteoles Morphology of Pleurospermum Hoffm. in Kun-Lun Mountains and Its Taxonomic Significance

利用体视显微镜对中国昆仑山地区分布的棱子芹属10种植物的总苞片、伞辐、小总苞片、果棱等微形态特征进行了观察,并编排分种检索表。结果表明:该地区植物的苞片特征可分为三大类:(1)总苞、小总苞均为长披针形;(2)总苞、小总苞均为叶状分裂;(3)总苞、小总苞异形。因此,这些总苞、小总苞的形态和数量有显著差别,在一定程度上能反映出类群间的关系,可为探讨该地区棱子芹属植物种间分类学问题提供了新的证据。

Bracts, rays, bracteoles and fruit ribs morphology of 10 species of Pleurospermum Hoffm growing in Kun-Lun Mountains were observed using a stereomicroscope, and a key to the species is provided. The results show that the species can be divided into three groups in terms of their morphology ： （ 1 ） Bracts and bracteoles are all lanceolate; （2）Bracts and bracteoles are all leaf-like, apex pinnatifid; （3）Bracteoles are different from bracts. So the shapes of Bracts and bracteoles provide new evidence for taxonomy. These properties can be regarded as the taxonomic bases among the＇ species of Pleurospermum Hoffm.