Wild Columbine
This plant contains ranunculin throughout the whole plant as well as many plants belonging to the family Ranunculaceae.   When the leaf or the stem is crushed or broken, ranunculin is decomposed into protoanemonin to develop toxicity.   Protoanemonin is highly-irritating to the skin and mucosa to develop blister with redness.   It causes inflammation of the stomach and intestines when eaten.   However, protoanemonen is unstable so it can change to being non-irritating.   Therefore, dried Aquilegia does not develop inflammation.
Wild Columbine grows naturally throughout North America from the Nova Scotia Peninsula, Canada to the eastern part of the Rocky Mountains in Texas and is 20 to 70cm in height.
The flower is two to three centimeters in length and blooms downwards at the tip of the stem.   It consists of five red sepals, five yellow petals, many stamens which project over petals and five pistils which extend longer than stamens.   The spur extends from the base of the petal to project past of the sepals.   Compare to (Aquilegia buergeriana var. pumila Huth endemic to Japan, the spur is thick and extend straight.   The stem and calyx have short white hairs.

Note:
Japanese name of Aquilegia, Odamaki, is named after the fact that the shape of this flower, especially the shape of its bud stage, resembles Odamaki, which is a thread spun from hemp and reeled to form a cavity at its center.
Classification: Ranunculaceae Aquilegia
Scientific name: Aquilegia canadensis L.
Japanese name: Kanada Odamaki
English Name: Wild Columbine
Native locality: From Nova Scotia Peninsula, Canada to the eastern part of the Rocky Mountains in Texas
Ecological description: Perennial
RDB : ---
Planting place: American Plant Garden
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