The Ikenobo school of ikebana uses the phrase, “Origin of Ikebana” because it was the original “school” of ikebana, the art of Japanese flower arranging. 
This school of Ikebana has evolved significantly over 555 years. The current headmaster, Sen’ei Ikenobo is the 45th headmaster and his daughter, Senko Ikenobo, is the headmaster designate.
The Ikenobo school of ikebana has styles of arranging that are complex and simple at the same time and all reflect an understanding and great appreciation of nature.
There are six basic styles within the Ikenobo school:
Shoka Shofutai (designs with one, two or three materials) dating from the 1700’s but evolving to reflect changes in material availability, modern homes and placement of an arrangement in homes.
Isshuike Shoka – one material 
Nishuike Shoka – two materials 
Sanshuike Shoka – three materials
Shoka Shimputai (designs with three materials) developed by the 45th headmaster in 1977.
Design on the left by Naples Ikenobo member, Daniela Klecan
Rikka Shofutai (more complex designs with historical signifigance from the 1600’s).
Pictured design by Sensei Stephanie English
Rikka Shimputai (simpler Rikka design with a modern expression) developed by the current headmaster in 1999.
Design on the left by Naples Ikenobo member, Jane Buenz
Free Style (a constantly evolving style).
Design on the right by Sensei Marcia Norberg
A very old style, not much written history and still evolving – Tatehana.
Pictured design from Kado Magazine