Renga are linked poems where the first half of the poem, hokku (ほっく), is written by someone and the second half is written by another person. The ‘linking’ is through use of words rather than the fact that two people wrote the poem. Renga were very popular during the Heianjidai (へいあんじだい) 794 – 1185 renga parties were often held by the upper class but as the popularity grew, people of all classes composed renga.
Hokku consist of 5-7-5 onji (おんじ). The second verse is 7-7 onji. If there is a third it will have 5-7-5 onji and the fourth 7-7 onji and so the pattern repeats until the end. Haiku (はいく) derive from hokku. ,Masaoka Shiki (まさおか しき) renamed Hokku to haiku and waka (わか) to tanka (たんか) at the of the 19th century.
Haikai no renga:
Haikai no renga (はいかいのれんが) is a genre of poetry and were referred to as ‘poetic spirit’ by Bashou (ばしょう) 1644 – 1694, one of the most famous poets of the Edojidai (えどじだい). Haikai (はいかい) are humorous haiku and the genre is often just called haikai. Haiku are a cross between hokku and haikai.
M, Asataro. 2002. Classic Haiku. Anthology of poems by Basho and his followers.Dover Publishers:New York