ホモテナシ

花入

CQ22 on 花入
They can either be placed on the floor (what's the deal with the 花板, by the way?), hung on the wall or hung from the ceiling.
真:
- anything made from brass or alloy of brass
- celadon
  - tenryu-ji, named after the Kyoto temple that traded with Lung-ch'uan Ming dynasty celadon, which has an olive green glaze
  - kinuta, which is bright bluish, mostly Southern Sung dynasty Lung-ch'uan, but also Southern Sung Kuan
  - shichikan, which is all other Chinese celadons from Ming to early Ch'ing dynasties and which are more glass-like, in between tenryu-ji and kinuta, often crackled glazed
  - nabeshima (japanese)
- sometsuke
- akae
- white porcelain
- There are typical 真 shapes, but they are not clearly defined in the article. I guess this is a good example though:

行
- All boat shapes (no matter the material, also bamboo)
- All glazed Japanese wares:
  - tamba
  - takatori
  - seto
  - raku (if shin shapes)
草:
- unglazed Japanese
  - Bizen
  - Iga
  - Shigaraki
  - Tamba
  - Tokoname
- raku (not shin shapes)
- bamboo (if not boat shaped)
- gourds
- baskets (first introduced by rikyu)
- wood
- Not Chinese, not Japanese
All can be used in any season, except for bamboo, gourds and wood, which are only used in furo (according to Cq22, namburoku sais they are the only ones that should be used). Lacquered Chinese baskets can be used all year around.
Lots of info also here: https://chanoyu.world/hanaire/