Oshu Chrysanthemum

...The tubular petals that extend around the flower have slender, long, sword-shaped petals and curled, round petals. It is considered good if they are mixed together in the right way and the round petals are tightly rolled. The clasped chrysanthemum, also known as the large clasped chrysanthemum, has thick, round petals that roll up powerfully and long, running petals around the flower, and is said to have originally been selected from the Oshu chrysanthemum. The single-petaled large chrysanthemum has about 14 to 20 flat or shallow, boat-shaped petals around the flower, and the navel of the flower's heart is widely exposed. It is generally made with 16 petals, modeled after the imperial crest. ...

*Some of the terminology that refers to "Oshu Chrysanthemum" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…周囲に伸びた管弁には花弁の先がすらりと伸びた剣走（けんばし）りと，くるりと巻いた玉巻（たままき）弁があり，これがほどよくまじり，また玉巻きがしっかり巻いているのが良いとされる。摑み菊というのは一名大摑みともいい，太い袋弁が力強く巻き上がり，また花の周囲には長く伸びた走り弁がある花型で，もと奥州菊から選抜されたものといわれる。一文字菊は一重の大型のキクで，花の周囲に平弁か浅い舟底弁が14～20枚くらいつき，花心のへその部分は大きく露出しているもので，一般には皇室の紋章になぞらえて，花弁を16枚に仕立てる。…

※「奥州菊」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報