also: やちぐさ
noun
many kinds; a great variety
Literary or poetic term for a vast number of varieties or types, often used in classical or elevated contexts.
この庭には八千種の花が咲き乱れている。
In this garden, a myriad of flowers are blooming in profusion.
八千種の思いが胸をよぎった。
Countless thoughts crossed my mind.
A more common, everyday term for 'many kinds' or 'diverse'; 八千種 is more poetic and emphasizes an immense, almost countless variety.
Composed of 八千 (yachi, 'eight thousand', a large number used figuratively for 'countless') and 種 (kusa/gusa, 'kind' or 'variety'). The exact historical derivation is uncertain, but the combination is a classical poetic expression for an immense variety.