亚历山大的帕珀斯/Pappus of Alexandria https://en.m.wikipedia.org/wiki/Pappus_of_AlexandriaPappus of Alexandria This article is about the Greek mathematician. For the flower structure, see Pappus (botany). Pappus of Alexandria (/ˈpæpəs/; Greek: Πάππος ὁ Ἀλεξανδ...
calyx- (botany) the whorl of sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing and supporting the developing bud; usually green thistledown- pappus of a thistle consisting of silky featherlike hairs attached to the seed-like fruit of a thistle...