Achenes 8 - ribbed, white pilose; pappus scabrous, 10-12 mm long, connate at base.
瘦果纺锤形，具8条纵棱，被白色长柔毛；冠毛粗糙，长10 - 12毫米，基部联合。
2
Some examples are given by inscribed and circumscribed circles of polygons, lines intersecting and tangent to conic sections, the Pappus and Menelaus configurations of points and lines.