the japanese language uses three writing systems, the pictorial kanji, and 2 phonetic syllabaries: hiragana and katakana. japanese is primarily the combination of kanji and hiragana. katakana is used for emphasis and foreign loan words. it's also used for scientific names, including plant species, so the words for dye plants are written with kanji or katakana. in an effort to make it easier to look up further information, i've tried to include all the ways of writing plant names whenever possible.