thyrsen. 聚傘圓錐花序學術名詞圓錐狀聚繖花序：植物學密錐花序：植物學簇集圓錐花序：植物學密集圓錐花序：植物學密束花序：植物學英文釋義a dense flower cluster (as of the lilac or horse chestnut) in which the main axis is racemose and the branches are cymose