noun
Technical botanical term for a type of inflorescence with sessile flowers on an elongated axis.
オオバコの花は穂状花序をつける。
Plantain flowers form a spike inflorescence.
Raceme inflorescence; similar elongated cluster but flowers have pedicels, unlike the sessile flowers of a spike.
Compound of 穂状 (spike-shaped) + 花序 (inflorescence).