花序 is read as かじょ (kajo) and means inflorescence.
かじょ
kajo
そうじょうかじょ
racemous inflorescence
ゆうげんかじょ
definite inflorescence
とうじょうかじょ
capitulum (inflorescence)
ふくそうじょうかじょ
compound raceme
しゅうさんかじょ
cymose inflorescence (any determinate simple inflorescence)
えんしんかじょ
centrifugal inflorescence
さんけいかじょ
umbellate inflorescence
ふくさんけいかじょ
compound umbellate inflorescence
さんぼうかじょ
corymbose inflorescence
いんとうかじょ
hypanthium
そうすいかじょ
racemose inflorescence (any indeterminate simple inflorescence)
すいじょうかじょ
spike (inflorescence)