Sailor Manyo Yamabuki is a bright sunshine yellow fountain pen ink with medium shading. It dries in 30 seconds in a medium nib on Rhodia and has an average flow. Made in Japan, it is available in a square 50ml bottle.

The Man'yōshū is a collection of Japanese poems which features approximately 4,000 entries collected over 400 years--1,500 of those relate to plants and flowers. Also known as the Collection of Ten Thousand Leaves, the anthology is one of Japan's most revered poetic compilations and mentions more than 150 species of plants. The Manyo line of inks from Sailor pays homage to various plants and flowers that have been mentioned. 

Yamabuki, aka Kerria japonica, is a deciduous shrub in the rose family that is native to China, Japan, and Korea. It is valued for its golden yellow flowers.