这似乎是一种奇怪的输出格式，但这里有一个例子，说明如何提供代码并（希望）得到答案。

library(dplyr)
library(tidyr)

# create example data 
df <- data.frame(pollinator = c(rep(4, 8), rep(5, 6), rep(6,2)),
                 flower_id = sample(c("H", "L"), 16, replace=TRUE))

# create a unique id by group
# transpose the dataframe
# join all the columns and rename it as sequence
# clean up the joined columns
df %>% 
  group_by(pollinator) %>% 
  mutate(n = 1:n(),
         id = paste0(pollinator, flower_id, n)) %>% 
  pivot_wider(-n, names_from = id, values_from = flower_id) %>% 
  unite(sequence, -pollinator, sep=" ") %>% 
  mutate(sequence = trimws(gsub("NA", "", sequence)))