Flours
Of the rice flours, we distinguish primarily between glutinous rice flours (もち米) and non-glutinous rice flours (うるち米). Glutinous rice flours create elastic, chewy textures because they contain almost pure amylopectin. Non-glutinous rice flours behave more like starch flours: they create structure, crumb, or a sandy texture depending on how they are processed. Roasted rice flours form a third functional group used mainly for dry sweets (干菓子).
もち粉
もち粉: Generic glutinous rice flour. Smooth, but slightly less elastic than 白玉粉.
白玉粉: Coarsely wet-milled glutinous rice flour. Produces the smoothest and most elastic もち texture. Preferred for high-quality もち and 求肥.
うるち粉
上新粉: Standard non-glutinous rice flour. Slightly coarse. Used for 団子,
草餅, 柏餅 and many steamed sweets.
上南粉: Very finely milled rice flour used for 押しもの and refined textures. If unavailable, grind 上新粉 and mix with 10% potato starch.
寒梅粉: Roasted and puffed rice flour ground into a dry sandy powder. Used mainly in 押しもの and 落雁-type sweets to create a light crumb.
かるかん粉: Rice flour used for かるかん. No clue what is different about that.
Other flours
Sugar
In Japan, there are 3 white sugars: 上白・グラニュ・ザラザラ. The first one has a direct, long lasting sweetness impression, the last one has a more abrupt end.
The first one carries a bit of moisture, so it dissolves readily.
桜